You searched for subject:(Drought).
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University of Georgia
1.
Milton, Ethan Foster.
Comparing cultivated sunflower (Helianthus) to two wild species for traits putatively associated with drought resistance.
Degree: MS, Plant Biology, 2013, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/milton_ethan_f_201305_ms 
► Drought is arguably the single greatest abiotic factor limiting plant productivity worldwide. Improving drought resistance of crops can counteract some of its detrimental effects. Identifying…
(more)
▼ Drought is arguably the single greatest abiotic factor limiting plant productivity worldwide. Improving
drought resistance of crops can counteract some of its detrimental effects. Identifying and incorporating variation from wild
drought resistant congeners into crops is one avenue for improvement. We investigated two wild species of sunflower, Helianthus argophyllus (ARG) and H. niveus spp. tephrodes, (TEPH) hypothesized to be
drought resistant and compared them to cultivated H. annuus (ANN) for
drought resistance traits related to rooting, leaf and germination characteristics at various ontogenetic stages. Contrary to expectation, wild sunflowers did not outperform ANN for germination and rooting traits putatively associated with
drought resistance, but TEPH exhibits leaf traits potentially useful in reducing heat load and water loss. Wild sunflowers do possess some traits that may potentially be useful for improving
drought resistance in cultivated sunflower.
Advisors/Committee Members: Lisa Donovan.
Subjects/Keywords: Drought
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APA (6th Edition):
Milton, E. F. (2013). Comparing cultivated sunflower (Helianthus) to two wild species for traits putatively associated with drought resistance. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/milton_ethan_f_201305_ms
Chicago Manual of Style (16th Edition):
Milton, Ethan Foster. “Comparing cultivated sunflower (Helianthus) to two wild species for traits putatively associated with drought resistance.” 2013. Masters Thesis, University of Georgia. Accessed April 01, 2020.
http://purl.galileo.usg.edu/uga_etd/milton_ethan_f_201305_ms.
MLA Handbook (7th Edition):
Milton, Ethan Foster. “Comparing cultivated sunflower (Helianthus) to two wild species for traits putatively associated with drought resistance.” 2013. Web. 01 Apr 2020.
Vancouver:
Milton EF. Comparing cultivated sunflower (Helianthus) to two wild species for traits putatively associated with drought resistance. [Internet] [Masters thesis]. University of Georgia; 2013. [cited 2020 Apr 01].
Available from: http://purl.galileo.usg.edu/uga_etd/milton_ethan_f_201305_ms.
Council of Science Editors:
Milton EF. Comparing cultivated sunflower (Helianthus) to two wild species for traits putatively associated with drought resistance. [Masters Thesis]. University of Georgia; 2013. Available from: http://purl.galileo.usg.edu/uga_etd/milton_ethan_f_201305_ms
University of Georgia
2.
Boleman, Timothy Brock.
Impact of market access programs on smallholder production and profitability during a drought season in Haiti.
Degree: MS, Agricultural Economics, 2016, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/boleman_timothy_b_201605_ms
► In developing rural areas, smallholder farmers often face poor market access conditions that impede productivity and financial growth. This paper evaluates a development project that…
(more)
▼ In developing rural areas, smallholder farmers often face poor market access conditions that impede productivity and financial growth. This paper evaluates a development project that aimed to increase farm profits in northern Haiti by extending credit for agricultural inputs and linking farmers to output markets. The interventions are divided into: 1) full maize program, 2) partial maize program, and 3) peanut program. Impacts estimated using propensity score methods indicate that the maize program, which packaged credit for seed with a tractor service, extension, and guaranteed purchase of harvest, had no impact on crop failure rates or farm income because of high crop failure rates, but a positive impact on net revenue due to lower input costs. The partial maize program, which only involved the tractor service, also suffered from crop failure but significantly increased income and net revenue as a result of lower labor requirements and more successful intercropping. The peanut program significantly decreased crop failure rates and increased farm income, but had no effect on net revenue due to high input costs. A sensitivity analysis reveals how results differ under varying assumptions for the opportunity cost of labor and loan repayment rates.
Advisors/Committee Members: Nicholas Magnan.
Subjects/Keywords: Drought
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APA (6th Edition):
Boleman, T. B. (2016). Impact of market access programs on smallholder production and profitability during a drought season in Haiti. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/boleman_timothy_b_201605_ms
Chicago Manual of Style (16th Edition):
Boleman, Timothy Brock. “Impact of market access programs on smallholder production and profitability during a drought season in Haiti.” 2016. Masters Thesis, University of Georgia. Accessed April 01, 2020.
http://purl.galileo.usg.edu/uga_etd/boleman_timothy_b_201605_ms.
MLA Handbook (7th Edition):
Boleman, Timothy Brock. “Impact of market access programs on smallholder production and profitability during a drought season in Haiti.” 2016. Web. 01 Apr 2020.
Vancouver:
Boleman TB. Impact of market access programs on smallholder production and profitability during a drought season in Haiti. [Internet] [Masters thesis]. University of Georgia; 2016. [cited 2020 Apr 01].
Available from: http://purl.galileo.usg.edu/uga_etd/boleman_timothy_b_201605_ms.
Council of Science Editors:
Boleman TB. Impact of market access programs on smallholder production and profitability during a drought season in Haiti. [Masters Thesis]. University of Georgia; 2016. Available from: http://purl.galileo.usg.edu/uga_etd/boleman_timothy_b_201605_ms
Texas A&M University
3.
Yildirim, Gokhan.
Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region.
Degree: 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/154966
► Though drought is a recurrent natural disaster in Texas, little attention has been so far paid to the preparedness of drought for spatial drought risk…
(more)
▼ Though
drought is a recurrent natural disaster in Texas, little attention has been so far paid to the preparedness of
drought for spatial
drought risk assessment. This study presents a methodology for spatial assessment of
drought hazard, vulnerability, and risk in the Edwards Aquifer (EA) region. A conceptual data-based framework for
drought hazard and vulnerability was developed in this study. Standardized Precipitation Index (SPI) and Effective
Drought Index (EDI) methods were used to identify
Drought Hazard Index (DHI) in different time steps, while the GIS environment was used to map the spatial extents of
drought hazards.
Drought Vulnerability Index (DVI) was identified by using different social and physical consequences of
drought and a thematic map was prepared on the county level for vulnerability assessment. The risk, as a result, was computed as the product of intersection between both the DHI and DVI. Very high
drought risk was found by 9 and 24-month SPI and EDI in Bexar (9.8% of the area). The highest percentage of the area in high level
drought risk was detected by 1 and 12-month SPI as 32.3% of the area and 3-mont SPI found the highest moderate percentage of the area (79.5%). Bexar was found under
drought risk based on all time scale SPI and EDI (very high
drought risk based on 9, 24-month SPIs and EDI). Medina, furthermore, was detected in high
drought risk in terms of all time scale SPI (except 3-month SPI) and EDI. In general,
drought risk is higher in counties of the southern part of the area. The results confirmed that higher
drought risks are found where both high hazard and high vulnerability coincide.
Advisors/Committee Members: Singh, Vijay P. (advisor), Karthikeyan, Raghupathy (committee member), Wurbs, Ralph A. (committee member).
Subjects/Keywords: drought hazard; drought risk assessment
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APA (6th Edition):
Yildirim, G. (2015). Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/154966
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yildirim, Gokhan. “Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region.” 2015. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/154966.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yildirim, Gokhan. “Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region.” 2015. Web. 01 Apr 2020.
Vancouver:
Yildirim G. Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/154966.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yildirim G. Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/154966
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Georgia
4.
Bartelme, Elise Michelle.
Investigation of drought resistance in the granite outcrop sunflower, Helianthus porteri, compared to three non-outcrop congeners.
Degree: MS, Plant Biology, 2014, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/bartelme_elise_m_201408_ms
► Helianthus porteri is a sunflower endemic to drought-prone granite outcrops, suggesting that this species possesses some combination of morphological and physiological traits which confer resistance…
(more)
▼ Helianthus porteri is a sunflower endemic to
drought-prone granite outcrops, suggesting that this species possesses some combination of morphological and physiological traits which confer resistance to
drought. We compared H. porteri to three other sunflowers from habitats with varying local water availability (H. agrestis, H. annuus and H. carnosus) in a series of experiments with well-watered, sustained mild
drought, and soil dry-down treatments. Under well-watered conditions, H. porteri exhibited a root system that allows for greater water uptake per unit mass as compared to the other species. In response to mild
drought H. porteri maintained photosynthetic rates while decreasing water loss. Finally, in response to a dry-down H. porteri wilted at a less-negative water potential. Compared to the other Helianthus species, H. porteri possess a unique combination of traits that provide increased water absorption and water conservation, supporting an avoidance strategy for
drought resistance.
Advisors/Committee Members: Lisa Donovan.
Subjects/Keywords: Drought stress
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APA (6th Edition):
Bartelme, E. M. (2014). Investigation of drought resistance in the granite outcrop sunflower, Helianthus porteri, compared to three non-outcrop congeners. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/bartelme_elise_m_201408_ms
Chicago Manual of Style (16th Edition):
Bartelme, Elise Michelle. “Investigation of drought resistance in the granite outcrop sunflower, Helianthus porteri, compared to three non-outcrop congeners.” 2014. Masters Thesis, University of Georgia. Accessed April 01, 2020.
http://purl.galileo.usg.edu/uga_etd/bartelme_elise_m_201408_ms.
MLA Handbook (7th Edition):
Bartelme, Elise Michelle. “Investigation of drought resistance in the granite outcrop sunflower, Helianthus porteri, compared to three non-outcrop congeners.” 2014. Web. 01 Apr 2020.
Vancouver:
Bartelme EM. Investigation of drought resistance in the granite outcrop sunflower, Helianthus porteri, compared to three non-outcrop congeners. [Internet] [Masters thesis]. University of Georgia; 2014. [cited 2020 Apr 01].
Available from: http://purl.galileo.usg.edu/uga_etd/bartelme_elise_m_201408_ms.
Council of Science Editors:
Bartelme EM. Investigation of drought resistance in the granite outcrop sunflower, Helianthus porteri, compared to three non-outcrop congeners. [Masters Thesis]. University of Georgia; 2014. Available from: http://purl.galileo.usg.edu/uga_etd/bartelme_elise_m_201408_ms
University of Georgia
5.
Litvin, Alexander Gaston.
Interaction of drought stress and gibberellin metabolism on stem elongation in tomato.
Degree: MS, Horticulture, 2015, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/litvin_alexander_g_201508_ms
► Drought reduces plant and cell elongation. Our objective was to quantify the effects of drought on elongation and gibberellin homeostasis. We exposed tomatoes to drought…
(more)
▼ Drought reduces plant and cell elongation. Our objective was to quantify the effects of
drought on elongation and gibberellin homeostasis. We exposed tomatoes to
drought to observe the effect on elongation and gibberellin metabolism-related gene expression. Plants were maintained at substrate moistures to provide well-watered or
drought conditions. To further investigate the effect of gibberellins on elongation, paclobutrazol (PAC) was applied, reducing gibberellin production.
Drought reduced height (P = 0.0012) under
drought, and had an interactive effect with PAC on internode length (P = 0.0004), and cell size (P = 0.0067). We analyzed the transcription of SlGA20ox1, -2, -3, and -4, SlGA3ox2, and SlGA2ox2, -4, and -5, corresponding to gibberellin biosynthesis. Transcription of LeEXP1, and -2, encoding for expansin enzymes, was also analyzed. Down regulation of transcription due to stress was observed for SlGA20ox4, SlGA2ox5, and LeEXP1. These findings emphasize the inhibiting effect
drought has on elongation during vegetative growth.
Advisors/Committee Members: Anish Malladi.
Subjects/Keywords: Drought stress
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APA (6th Edition):
Litvin, A. G. (2015). Interaction of drought stress and gibberellin metabolism on stem elongation in tomato. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/litvin_alexander_g_201508_ms
Chicago Manual of Style (16th Edition):
Litvin, Alexander Gaston. “Interaction of drought stress and gibberellin metabolism on stem elongation in tomato.” 2015. Masters Thesis, University of Georgia. Accessed April 01, 2020.
http://purl.galileo.usg.edu/uga_etd/litvin_alexander_g_201508_ms.
MLA Handbook (7th Edition):
Litvin, Alexander Gaston. “Interaction of drought stress and gibberellin metabolism on stem elongation in tomato.” 2015. Web. 01 Apr 2020.
Vancouver:
Litvin AG. Interaction of drought stress and gibberellin metabolism on stem elongation in tomato. [Internet] [Masters thesis]. University of Georgia; 2015. [cited 2020 Apr 01].
Available from: http://purl.galileo.usg.edu/uga_etd/litvin_alexander_g_201508_ms.
Council of Science Editors:
Litvin AG. Interaction of drought stress and gibberellin metabolism on stem elongation in tomato. [Masters Thesis]. University of Georgia; 2015. Available from: http://purl.galileo.usg.edu/uga_etd/litvin_alexander_g_201508_ms
University of Georgia
6.
McCargo, Jeremy Walker.
Influence of drought of seasonal fish assemblages and habitat in the lower Flint River Basin, Georgia.
Degree: MS, Forest Resources, 2004, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/mccargo_jeremy_w_200408_ms
► Seasonal fish assemblages and their habitats were examined in the lower Flint River Basin during the drought years of 2001 and 2002 and the non-drought…
(more)
▼ Seasonal fish assemblages and their habitats were examined in the lower Flint River Basin during the
drought years of 2001 and 2002 and the non-
drought year of 2003. Species richness, biomass, and Index of Biotic Integrity were lower during the
drought years, which suggested that low streamflows had negative effects on the fish assemblages. Fishes were able to recolonize
drought-affected streams presumably by large-scale, seasonal movements of adult and juvenile fish. Species richness and biomass also were higher in groundwater-dominated streams during winter and summer, which suggests that these streams function both as winter thermal refugia and as significant fish production areas throughout the year. Findings from this study suggest that stream fragmentation could limit natural recolonization of impacted stream reaches and that lower Flint River Basin aquatic biota would benefit from management decisions based on streamflow models that incorporate both spatial and temporal components for evaluating long-term effects of flow policies.
Advisors/Committee Members: James T. Peterson.
Subjects/Keywords: Drought
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APA (6th Edition):
McCargo, J. W. (2004). Influence of drought of seasonal fish assemblages and habitat in the lower Flint River Basin, Georgia. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/mccargo_jeremy_w_200408_ms
Chicago Manual of Style (16th Edition):
McCargo, Jeremy Walker. “Influence of drought of seasonal fish assemblages and habitat in the lower Flint River Basin, Georgia.” 2004. Masters Thesis, University of Georgia. Accessed April 01, 2020.
http://purl.galileo.usg.edu/uga_etd/mccargo_jeremy_w_200408_ms.
MLA Handbook (7th Edition):
McCargo, Jeremy Walker. “Influence of drought of seasonal fish assemblages and habitat in the lower Flint River Basin, Georgia.” 2004. Web. 01 Apr 2020.
Vancouver:
McCargo JW. Influence of drought of seasonal fish assemblages and habitat in the lower Flint River Basin, Georgia. [Internet] [Masters thesis]. University of Georgia; 2004. [cited 2020 Apr 01].
Available from: http://purl.galileo.usg.edu/uga_etd/mccargo_jeremy_w_200408_ms.
Council of Science Editors:
McCargo JW. Influence of drought of seasonal fish assemblages and habitat in the lower Flint River Basin, Georgia. [Masters Thesis]. University of Georgia; 2004. Available from: http://purl.galileo.usg.edu/uga_etd/mccargo_jeremy_w_200408_ms
Texas A&M University
7.
Bynum, Joshua Brian.
Physiological applications for determining water use efficiency among cotton genotypes.
Degree: 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2635
► Drought stress can substantially alter plant metabolism by decreasing plant growth and photosynthesis. The lack of rapid and reliable screening criteria and measurement techniques for…
(more)
▼ Drought stress can substantially alter plant metabolism by decreasing plant
growth and photosynthesis. The lack of rapid and reliable screening criteria and
measurement techniques for determining water use efficiency (WUE) of crop plants has
greatly restricted progress in this critical area of crop improvement. In grain sorghum
(Sorghum bicolor L.), WUE was associated with the transpiration ratio [CO2
assimilation (A) / transpiration rate (E), A:E] from leaf gas exchange measurements.
Research is needed to identify
drought effects on plant productivity and to exploit the
use of this knowledge in breeding and agronomic efforts. Therefore, the objectives of
this study were to determine if differences in A:E and other physiological parameters
existed between two selected cotton (Gossypium hirsutum L.) genotypes and to evaluate
the response of cotton genotypes experiencing water stress at two different growth stages
on biomass production and yield.
Two experiments were conducted using two cotton genotypes differing in
drought tolerance. Each experiment was repeated three times in a randomized complete
block design with six replications. In Experiment I, the water stress treatment was
induced by withholding water when the plants reached the 4-node growth stage. The water stress treatment in Experiment II was imposed at early bloom. Gas exchange and
chlorophyll fluorescence measurements were collected during dry-down and recovery
periods to determine water stress effects on plant physiology. Biomass was partitioned
following the recovery period, to examine phenotypic responses of plants exposed to
water stress.
The results of these experiments indicate that A:E is significantly increased as
leaf water potential (?L) decreases with no differences in A:E between the two
genotypes. Gas exchange measurements showed significant decreases with declining ?L
and significant increases upon re-watering; yet, no differences were observed between
the two genotypes. Chlorophyll fluorescence was not different between genotypes in
either light- or dark-adapted leaves. In Experiment I TAM 89E-51 had a significantly
greater seedcotton yield; however, in Experiment II TAMCOT 22 had the greater yield.
These experiments suggest that the effects of water stress on cotton are a function of the
intensity of the stress and the growth stage in which the stress is experienced.
Advisors/Committee Members: Cothren, Joe Tom (advisor), Balota, Maria (committee member), Lemon, Robert G. (committee member), Lombardini, Leonardo (committee member).
Subjects/Keywords: Cotton; drought
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Manager
APA (6th Edition):
Bynum, J. B. (2009). Physiological applications for determining water use efficiency among cotton genotypes. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2635
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bynum, Joshua Brian. “Physiological applications for determining water use efficiency among cotton genotypes.” 2009. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-2635.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bynum, Joshua Brian. “Physiological applications for determining water use efficiency among cotton genotypes.” 2009. Web. 01 Apr 2020.
Vancouver:
Bynum JB. Physiological applications for determining water use efficiency among cotton genotypes. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2635.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bynum JB. Physiological applications for determining water use efficiency among cotton genotypes. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2635
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
McRoberts, Douglas Brent.
Drought over the past century in Texas and New Mexico: reducing inhomogeneities in long-term climate records via statistical methods to study drought.
Degree: 2008, Texas A&M University
URL: http://hdl.handle.net/1969.1/85898
► This research looks at the past century of Texas and New Mexico climate in order to create datasets sufficient for documenting climatic variations. Inhomogeneities in…
(more)
▼ This research looks at the past century of Texas and New Mexico climate in order
to create datasets sufficient for documenting climatic variations. Inhomogeneities in
climate records are defined as variations in climatic records caused by factors other than
weather and climate. While there are indirect methodologies for inferring climate records
such as tree rings and ice cores, it is the instrumental network that constitutes the most
spatially and temporally complete record of land surface climate since the onset of the
Industrial Revolution. A statistical method by Sun and Peterson (2005a) called Inverse
Weighting of Square Distance (IWSD) will be used to reduce the inhomogeneities in
climate records.
The National Weather Service Cooperative Observer Program (COOP) network
of stations will be used for this analysis. A subset of the extensive COOP network, called
the United States Historical Climate Network (USHCN), will be used as a foundation for
this study. The analysis and resulting datasets from this climatic study show precipitation
trends and periods of
drought and will be useful for decisions regarding future policies on
drought. The result of the interpolation process was the creation of several COOP and
USHCN datasets. Several of the datasets were investigated to determine the spatial
characteristics of precipitation over the 20th century in Texas and New Mexico. The
datasets are in good agreement that the most severe
drought period of the 20th century in
Texas and New Mexico was in the 1950s. The frequency of pluvial periods was higher
toward the end of the 20th century, with most USHCN stations showing an increasing
trend when a linear regression analysis was done on each station's precipitation data.
Advisors/Committee Members: Nielsen-Gammon, John W. (advisor), Zhang, Fuqing (committee member), Quiring, Steven (committee member).
Subjects/Keywords: Drought
…viii
Page
10. PRECIPITATION DISTRIBUTION EXTREMES AND DROUGHT .............
112
a… …Precipitation of Moderate and Extreme Drought Months for COOP
Climate Divisions… …i. Durations below the Four Drought Thresholds for COOP Climate Division
Data… …averaged values, from the CqY dataset were below specific
drought thresholds… …averaged values, from the CqY dataset were below specific
drought thresholds…
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APA ·
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APA (6th Edition):
McRoberts, D. B. (2008). Drought over the past century in Texas and New Mexico: reducing inhomogeneities in long-term climate records via statistical methods to study drought. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/85898
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
McRoberts, Douglas Brent. “Drought over the past century in Texas and New Mexico: reducing inhomogeneities in long-term climate records via statistical methods to study drought.” 2008. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/85898.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McRoberts, Douglas Brent. “Drought over the past century in Texas and New Mexico: reducing inhomogeneities in long-term climate records via statistical methods to study drought.” 2008. Web. 01 Apr 2020.
Vancouver:
McRoberts DB. Drought over the past century in Texas and New Mexico: reducing inhomogeneities in long-term climate records via statistical methods to study drought. [Internet] [Thesis]. Texas A&M University; 2008. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/85898.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McRoberts DB. Drought over the past century in Texas and New Mexico: reducing inhomogeneities in long-term climate records via statistical methods to study drought. [Thesis]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/85898
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Neuchâtel
9.
Möck, Christian.
Evaluating the effect of climate change on groundwater
resources: from local to catchment scale.
Degree: 2013, Université de Neuchâtel
URL: http://doc.rero.ch/record/209740
► There is strong evidence that climate is changing and will affect the water resources. A major question arising from the evaluation of climate change (CC)…
(more)
▼ There is strong evidence that climate is changing and
will affect the water resources. A major question arising from the
evaluation of climate change (CC) impacts on groundwater resources
is to what extent groundwater recharge will change. Given that for
Switzerland, climate models predict more frequent hot and dry
summers in the future while precipitation will tend to increase in
winter, a special attention was given to possible changes in the
seasonal distribution of recharge. However, to provide robust
predictions, uncertainty has to be considered in all simulations.
Three uncertainty sources can be distinguished: the latter can
originate from climate models uncertainty, the unknown evolution of
land use and society in general, and the hydrological models
themselves. The role of these three types of uncertainty has
received a major attention in this study. Three studies were
carried out to evaluate the effect of CC on the hydrological
system. Two of these studies were dedicated to the topic of
groundwater recharge whereas the third was focused on the CC
response of an aquifer system. The first recharge
related study deals with the question of how uncertainty due to
climate models interacts with uncertainty associated with different
hydrological models. Although different models were used to
simulate groundwater recharge in numerous climate impact studies,
it is not yet clear whether models of different complexity give
similar recharge predictions for a given climate scenario.
Therefore, five different commonly used approaches to simulate
groundwater recharge were compared under CC. In this
analysis models with different complexity were applied over a time
span of several years and predictive model bias occurs. Using CC
data with more extreme weather conditions increases the resulting
bias. The potential for model predictive error increases with the
difference between the climatic forcing function used in the CC
predictions and the climatic forcing function used in calibration
period. The difference between the reference recharge and simulated
recharge from physical based but homogenous model as well as
semi-mechanistic model are smallest whereas the differences
increase with the simple models. The differences are due to
structural model deficits such as the limitation of reproducing
preferential flow. Thus, results of CC impact studies using the
soil water balance approach to estimate recharge need to be
interpreted with caution, although the majority of CC impact
assessment studies are using this approach. Comparison of both
uncertainties, i.e. CC and model simplification, indicate that the
highest uncertainty is related to CC, but a model simplification
can also introduce a significant predictive error. The
second recharge related study explores how different crops and crop
rotations influence CC effects on groundwater recharge. The
predicted temperature increase will doubtlessly lead to an increase
in evaporation and can be intensified by the presence of crops. To
address this question, we relied…
Advisors/Committee Members: Daniel (Dir.), Philip (Codir.).
Subjects/Keywords: drought frequency
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APA (6th Edition):
Möck, C. (2013). Evaluating the effect of climate change on groundwater
resources: from local to catchment scale. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/209740
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Möck, Christian. “Evaluating the effect of climate change on groundwater
resources: from local to catchment scale.” 2013. Thesis, Université de Neuchâtel. Accessed April 01, 2020.
http://doc.rero.ch/record/209740.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Möck, Christian. “Evaluating the effect of climate change on groundwater
resources: from local to catchment scale.” 2013. Web. 01 Apr 2020.
Vancouver:
Möck C. Evaluating the effect of climate change on groundwater
resources: from local to catchment scale. [Internet] [Thesis]. Université de Neuchâtel; 2013. [cited 2020 Apr 01].
Available from: http://doc.rero.ch/record/209740.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Möck C. Evaluating the effect of climate change on groundwater
resources: from local to catchment scale. [Thesis]. Université de Neuchâtel; 2013. Available from: http://doc.rero.ch/record/209740
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
10.
McDaniel, Rachel Leah.
Crop- and Location-Specific Drought Index for Agricultural Water Management: Development, Evaluation, and Forecasting.
Degree: 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155528
► Severe droughts have plagued the United States over the last few years. The 2011 Texas drought, the 2012 U.S. drought, and the current California drought…
(more)
▼ Severe droughts have plagued the United States over the last few years. The 2011 Texas
drought, the 2012 U.S.
drought, and the current California
drought have greatly impacted the nation?s economy and agricultural production. Different crops vary in their response to water stress. Despite this, commonly used
drought indices, such as the Palmer
Drought Severity Index, do not consider crop specific factors. The goal of this project was to create a methodology to produce crop and location specific
drought and yield trend forecasts to help agricultural producers make more informed water management decisions. To achieve this, a
drought index was developed and analyzed, weather forecasts were used in a hydrology/crop model to predict hydrologic conditions and crop yields, and an example interactive map interface were created to convey this information to water stakeholders.
The
drought index uses five parameters that affect or are affected by
drought. These parameters include precipitation, temperature, cumulative biomass, soil moisture, and transpiration. Soil moisture and temperature are ranked against crop-specific threshold values, while precipitation and cumulative biomass are ranked against location-specific normal values. Transpiration is ranked against the location-specific potential transpiration. A case study was performed in the Upper Colorado River Basin located in West Texas using this
drought index. Cotton is the primary crop grown in the watershed and was used in this study. The Soil and Water Assessment Tool (SWAT) was used to estimate the cumulative biomass, soil moisture, and transpiration. A multiple linear regression model was developed for each week of the growing season based on the significant parameters during that stage of the growing season. These models were used to predict yield trends and
drought severity.
Two week forecasts for each
drought parameter, yield trends, and the
drought index were generated for 2010 through 2013 by using forecasted precipitation and temperature data as inputs for the hydrologic and crop model. This provided forecasted soil moisture, transpiration, and cumulative biomass production. Parameter rankings, yield trends, and the
drought index were compared for those calculated with actual precipitation and temperature data as well as forecasted precipitation and temperature data. The precipitation ranking, temperature ranking, cumulative biomass ranking, transpiration ranking, estimated yield trends, and
drought index indicated satisfactory forecast results. The soil moisture forecast did not result in satisfactory forecast.
The final step in the project was to create an example interface for agricultural producers and water managers to view
drought related stresses. ArcGIS online was used to create maps which show graphs of the weekly
drought index and soil moisture ranking. Maps were created at the county scale. These maps provide agricultural producers readily accessible information that can be used for decision making related to water management.
Advisors/Committee Members: Munster, Clyde (advisor), Nielsen-Gammon, John (committee member), Smith, Patricia (committee member), Smith, Wayne (committee member).
Subjects/Keywords: Drought; Forecasting; SWAT model; Agricultural Drought; Cotton
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APA ·
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CSE |
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APA (6th Edition):
McDaniel, R. L. (2015). Crop- and Location-Specific Drought Index for Agricultural Water Management: Development, Evaluation, and Forecasting. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155528
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
McDaniel, Rachel Leah. “Crop- and Location-Specific Drought Index for Agricultural Water Management: Development, Evaluation, and Forecasting.” 2015. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/155528.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McDaniel, Rachel Leah. “Crop- and Location-Specific Drought Index for Agricultural Water Management: Development, Evaluation, and Forecasting.” 2015. Web. 01 Apr 2020.
Vancouver:
McDaniel RL. Crop- and Location-Specific Drought Index for Agricultural Water Management: Development, Evaluation, and Forecasting. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/155528.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McDaniel RL. Crop- and Location-Specific Drought Index for Agricultural Water Management: Development, Evaluation, and Forecasting. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155528
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
11.
Maeda, Murilo Minekawa 1985-.
Advanced Analysis of the Responses of Cotton Genotypes Growing Under Water Stress.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148205
► The ever-growing world population raises the concern and necessity of rational use and distribution of limited water resources. Water deficit is the single most dominant…
(more)
▼ The ever-growing world population raises the concern and necessity of rational use and distribution of limited water resources. Water deficit is the single most dominant abiotic factor limiting cotton (Gossypium hirsutum L.) yield in
drought-prone Texas croplands. Characterizing plant traits conferring
drought tolerance to cotton genotypes and then transferring this information back to breeders and geneticists have the potential of significantly increasing and stabilizing production statewide. Although a plethora of physiological studies have been conducted and have demonstrated that
drought tolerance in plants is likely to be conferred by a combination of plant traits rather than a single trait, this knowledge has not translated into improved breeding lines. Experiments were conducted in 2010 and 2011 in the
Drought Tolerance Laboratory (Texas AgriLife Research and Extension Center in Corpus Christi, TX) to analyze the responses of cotton genotypes to different levels of water stress. This facility is equipped with computerized systems capable of continuously monitoring whole-plant water use as well as several environmental parameters. Sixteen cotton genotypes were provided by Monsanto Co. and the Texas AgriLife Cotton Improvement Programs at College Station and Lubbock. Seeds were pre-germinated in wet paper towels and then hand planted in large pots previously filled with fritted clay. A total of 3 and 8 (2010 and 2011, respectively) pots containing plants of each genotype were permanently placed on micro-lysimeters for continuous measurement of water use. Water regimes were imposed in 2010 (well-watered and water-stressed), and 2011 (water-stressed) when plants reached the early-flowering stage and were carried until plants reached maturity (100% open bolls).
Data collected showed that genotypes have very distinct water use patterns. The water stress treatment imposed on the test plants negatively affected plant growth that was indicated by a lower plant height, total number of leaves, and main-stem nodes of stressed plants when contrasted to their well-watered counterparts. Stomatal density was remarkably different among genotypes and a higher density was found on the abaxial (lower) leaf surface for all genotypes studied. Root dry mass production had different responses depending upon the severity of the water stress. Highest root dry mass was observed when plants were exposed to a mild stress and lowest when a more severe water restriction was imposed.
Advisors/Committee Members: Fernandez, Carlos J (advisor), Cothren, Joe T (advisor), Searcy, Stephen W (committee member).
Subjects/Keywords: drought responses; water stress; drought; cotton
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APA (6th Edition):
Maeda, M. M. 1. (2012). Advanced Analysis of the Responses of Cotton Genotypes Growing Under Water Stress. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148205
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Maeda, Murilo Minekawa 1985-. “Advanced Analysis of the Responses of Cotton Genotypes Growing Under Water Stress.” 2012. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/148205.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Maeda, Murilo Minekawa 1985-. “Advanced Analysis of the Responses of Cotton Genotypes Growing Under Water Stress.” 2012. Web. 01 Apr 2020.
Vancouver:
Maeda MM1. Advanced Analysis of the Responses of Cotton Genotypes Growing Under Water Stress. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/148205.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Maeda MM1. Advanced Analysis of the Responses of Cotton Genotypes Growing Under Water Stress. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148205
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Anna University
12.
Sakthivel B.
Drought assessment and fuzzy rule based drought
forecasting;.
Degree: Drought assessment and fuzzy rule based drought
forecasting, 2015, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/35503
► Droughts are destructive climatic extreme events those may cause newlinesignificant damage to natural environments and human lives Drought newlinepreparedness can be developed to manage drought…
(more)
▼ Droughts are destructive climatic extreme events
those may cause newlinesignificant damage to natural environments
and human lives Drought newlinepreparedness can be developed to
manage drought impacts The success of newlinethis depends amongst
the others on how well the droughts are defined and newlinedrought
characteristics quantified The basic requirement of mitigating the
newlinedetrimental effects of droughts is the ability to forecast
drought conditions in newlineadvance Accordingly the primary
objective of this study is framed to newlinedevelop a methodology
for drought assessment and forecasting newline
newline
Reference p.169-176
Advisors/Committee Members: Ravikumar G.
Subjects/Keywords: civil engineering; Drought assessment; drought forecasting
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CSE |
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Manager
APA (6th Edition):
B, S. (2015). Drought assessment and fuzzy rule based drought
forecasting;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/35503
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
B, Sakthivel. “Drought assessment and fuzzy rule based drought
forecasting;.” 2015. Thesis, Anna University. Accessed April 01, 2020.
http://shodhganga.inflibnet.ac.in/handle/10603/35503.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
B, Sakthivel. “Drought assessment and fuzzy rule based drought
forecasting;.” 2015. Web. 01 Apr 2020.
Vancouver:
B S. Drought assessment and fuzzy rule based drought
forecasting;. [Internet] [Thesis]. Anna University; 2015. [cited 2020 Apr 01].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/35503.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
B S. Drought assessment and fuzzy rule based drought
forecasting;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/35503
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
13.
Longenberger, Polly Suzanne.
Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton.
Degree: 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2815
► A novel bioassay for the evaluation of plant water status was developed by Burke (2007). The research reported herein was designed to evaluate this new…
(more)
▼ A novel bioassay for the evaluation of plant water status was developed by Burke
(2007). The research reported herein was designed to evaluate this new protocol as a
tool for use in cotton breeding programs for the identification of
drought tolerant
genotypes. Twenty genotypes were selected to represent diverse germplasm pools for a
two-year field evaluation. Replicated tests were performed in Lubbock, TX and College
Station, TX in 2005, 2006, and 2007. Dryland and irrigated treatments were
administered in a split plot arrangement of a randomized complete block design.
Fluorescence measurements were taken at mid-bloom and late bloom growth stages of
growth. Source leaf tissue was harvested at predawn and subjected to high temperature
incubation with fluorescence measurements subsequently taken hourly for five hours.
Drought stressed plants had not mobilized their carbohydrate reserves from their source
leaves overnight and thus maintained cell viability and therefore higher chlorophyll
fluorescence values throughout the incubation with the opposite being true for nonstressed
plants. Fiber lint yield and fiber properties were measured at the conclusion of
the 2005 season in College Station and the 2006 season in College Station and Lubbock for comparison with the fluorescence data. Five genotypes, ?Acala 1517-99?, ?Deltapine
491? (PVP no. 200100159), ?Tamcot CAMD-E?, ?Tamcot 22? and TAM 89E-51, an
unreleased breeding line, were selected based on field evaluation results in a preliminary
study in 2005 to be included in a diallel analysis to determine the heritability of
fluorescence measurements. Genotype x treatment effects complicated the classification
of genotypic responses to
drought. Few and inconsistent correlations were found among
fluorescence values and lint yield or fiber properties. The diallel analysis did not
identify general combining ability or specific combining ability effects for chlorophyll
fluorescence measurements. Thus this procedure provides little potential in selecting
plants for
drought tolerance when plants are grown under field culture. Selection among
Tamcot 22 and TAM 89E-51 plants for high and low genotypes according to
fluorescence values did not yield progeny different from unselected Tamcot 22 and
TAM 89E-51.
Advisors/Committee Members: Smith, C. Wayne (advisor), Duke, Sara E. (committee member), McMichael, Bobbie L. (committee member), Rooney, William L. (committee member).
Subjects/Keywords: cotton; drought; fluorescence
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Longenberger, P. S. (2009). Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Longenberger, Polly Suzanne. “Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton.” 2009. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-2815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Longenberger, Polly Suzanne. “Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton.” 2009. Web. 01 Apr 2020.
Vancouver:
Longenberger PS. Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Longenberger PS. Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hawaii – Manoa
14.
Saliendra, Nicanor Z.
Root-shoot interactions in the response of sugarcane to drought.
Degree: PhD, 2009, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/9258
► Microfiche.
xiv, 124 leaves, bound ill. 29 cm
Studies using greenhouse-grown plants of sugarcane cultivars known to have varying levels of resistance to drought were…
(more)
▼ Microfiche.
xiv, 124 leaves, bound ill. 29 cm
Studies using greenhouse-grown plants of sugarcane cultivars known to have varying levels of resistance to drought were conducted to identify distinctive physiological features that may confer drought resistance in sugarcane. When leaf water relations, stomatal conductance (g), and shoot growth rate (SGR) were measured concurrently during a soil drying cycle, it was found that both osmotic and elastic adjustment occurred in the leaves of all cultivars in response to soil drying and diurnal water deficit. These adjustments led to almost complete maintenance of symplast volume, but only partial maintenance of turgor. During the early stages of drought, reductions in g and SGR were not accompanied by significant reductions in bulk leaf water status, suggesting that signals originating within the roots may have regulated shoot behavior. When the hydraulic properties of entire root systems and isolated roots were characterized by the transpiration gradient and pressure-flux techniques, cultivar differences in both root- and leaf-specific root hydraulic conductance (Groot) were discerned. At high soil moisture, transpiration and Groot differed considerably among cultivars and were positively correlated, whereas leaf water potential (ψL) was similar among cultivars. Within a narrow range of soil water suction (0 to 0.1 MPa), over which Groot and g fell to nearly zero, ψL remained nearly constant because the vapor phase conductance of the leaves and the liquid phase conductance of the roots declined in parallel. These patterns reinforced the suggestion that control of g in sugarcane plants exposed to drying soil was exerted primarily at the root rather than at the leaf level. Cultivar variation in water relations characteristics, especially bulk tissue elasticity, was more distinct in the roots than in the leaves, suggesting that the previously reported cultivar differences in drought resistance were likely to be root-based. It was hypothesized that coordination of g with declining Groot during soil drying was accomplished by a chemical signal moving from the roots to the leaves via the transpiration stream. Decreased root osmotic potential may have stimulated export of this putative substance from the roots.
Subjects/Keywords: Sugarcane – Drought tolerance
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APA (6th Edition):
Saliendra, N. Z. (2009). Root-shoot interactions in the response of sugarcane to drought. (Doctoral Dissertation). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/9258
Chicago Manual of Style (16th Edition):
Saliendra, Nicanor Z. “Root-shoot interactions in the response of sugarcane to drought.” 2009. Doctoral Dissertation, University of Hawaii – Manoa. Accessed April 01, 2020.
http://hdl.handle.net/10125/9258.
MLA Handbook (7th Edition):
Saliendra, Nicanor Z. “Root-shoot interactions in the response of sugarcane to drought.” 2009. Web. 01 Apr 2020.
Vancouver:
Saliendra NZ. Root-shoot interactions in the response of sugarcane to drought. [Internet] [Doctoral dissertation]. University of Hawaii – Manoa; 2009. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/10125/9258.
Council of Science Editors:
Saliendra NZ. Root-shoot interactions in the response of sugarcane to drought. [Doctoral Dissertation]. University of Hawaii – Manoa; 2009. Available from: http://hdl.handle.net/10125/9258
University of Nairobi
15.
Waweru, John K.
Influence of drought mitigation strategies on food security: a case of laikipia east, laikipia county, kenya.
Degree: 2016, University of Nairobi
URL: http://hdl.handle.net/11295/97279
► Achieving food security in the Kenyan ASALs during drought is a constant challenge that begs for action. Reactive crisis approach to drought-risk management have over…
(more)
▼ Achieving food security in the Kenyan ASALs during drought is a constant challenge that begs for action. Reactive crisis approach to drought-risk management have over time been ineffective and poorly coordinated leading vulnerability of households to food insecurity despite development and implementation of drought risk mitigation strategies under HFA 2005-2015. This study sought to establish how drought mitigation strategies influence household food security in Laikipia East sub-County, Laikipia County, Kenya. The specific objectives looked at how drought preparedness, drought response activities and drought reconstruction activities after drought influence household food security. The study used descriptive research design. The population targeted was agro-pastoral households in Laikipia East Sub-county. Five sub-areas were purposively selected for the study. A sample was selected by use of Krejcie and Morgan table for determining sample size and sample of 242 households was selected from a target population of 649 households. Data was collected by use of questionnaires administered in the field to randomly selected households and eight key informants making a total of 250 respondents. However received filled questionnaires from the households, 219 were considered complete and reflective of study objectives. Data was analyzed by use of Statistical Package for Social Scientists and Microsoft Excel and presented using tables and subsequently interpreted. The findings of the study were that drought mitigation strategies influenced household food security but they were poorly coordinated, late, and insufficient and also lacked sufficient funding. The study also found out that household participation was low in implementation. The study recommends more capacity building on drought mitigation strategies, timely planning for drought to ensure coordinated response to drought especially in human and livestock relief projects. Finally the study recommends involvement of technical field officials and local leaders as they are better placed to identify working strategies and rightful targeting.
Subjects/Keywords: Drought Mitigation Strategies
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APA (6th Edition):
Waweru, J. K. (2016). Influence of drought mitigation strategies on food security: a case of laikipia east, laikipia county, kenya.
(Thesis). University of Nairobi. Retrieved from http://hdl.handle.net/11295/97279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Waweru, John K. “Influence of drought mitigation strategies on food security: a case of laikipia east, laikipia county, kenya.
” 2016. Thesis, University of Nairobi. Accessed April 01, 2020.
http://hdl.handle.net/11295/97279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Waweru, John K. “Influence of drought mitigation strategies on food security: a case of laikipia east, laikipia county, kenya.
” 2016. Web. 01 Apr 2020.
Vancouver:
Waweru JK. Influence of drought mitigation strategies on food security: a case of laikipia east, laikipia county, kenya.
[Internet] [Thesis]. University of Nairobi; 2016. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/11295/97279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Waweru JK. Influence of drought mitigation strategies on food security: a case of laikipia east, laikipia county, kenya.
[Thesis]. University of Nairobi; 2016. Available from: http://hdl.handle.net/11295/97279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Zambia
16.
Mooya, Dennis.
Evaluation of water use for drought tolerance in Maize (Zea Mays L) Genotypes under deficit irrigation
.
Degree: 2015, University of Zambia
URL: http://hdl.handle.net/123456789/3690
► The problem of drought and erratic rainfall, coupled with crop genotypes (both local and improved varieties) with low water utilisation efficiencies, are major contributors to…
(more)
▼ The problem of drought and erratic rainfall, coupled with crop genotypes (both local and improved varieties) with low water utilisation efficiencies, are major contributors to low productivity of most crops. The poor agricultural productivity among the farming community results in poverty and food insecurity at national level and in low household incomes.
Selection of drought adapted genotypes in breeding programmes and efficient use of water are among the most important approaches in combating climate change effects like droughts and erratic rainfall. This study was conducted to characterise drought tolerance of twelve maize genotypes. An experiment was set up at the National Irrigation Research Station in Mazabuka, to determine the response of these genotypes to three water regimes at 30 %, 60 % and 100 % of crop water requirement (ETc). The twelve maize genotypes were planted at each water regime in a split – plot design arranged in a randomized layout. To evaluate the water utilisation of each maize genotype, water use efficiency, crop water productivity, crop yield response factor and harvest index were determined from the grain yield, above ground biomass and data collected during the experiment.
Deficit irrigation (30 % and 60 % ETc) resulted in crop yield reduction and significant effects on most of the measured parameters. Anthesis – silking interval was shortened, plant girth and height equally decreased with increased water stress at 30 % of ETc. The results showed variations in maize yield and this was attributed to genotype and water regime. The genotypes and water regimes contributed to yield by 30 % and 50.2 %, respectively. The grain yield in genotypes L512, L353, L857 and L07 had a yield advantage of 36.8 %, 34.6 %, 27.6 % and 18.0 %, respectively above the overall mean. Water Use Efficiency (WUE) at 30 % water regime was high in maize genotypes L512, L60, L713 and L857 with 2.412, 1.818, 1.900 and 2.265 kg/mm/ha, respectively. The Crop Yield Response Factor of genotypes L353, L512, L07 and L857 at 60 % water regime were below 1.0 indicating an efficient water use by most genotypes at 60 % water regime which resulted in a seasonal accumulative value of 505.3 mm for the season under study.
Based on the results, genotypes L512, L857, L07 and L353, were selected as drought tolerant genotypes.
Subjects/Keywords: Corn-Drought tolerance
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APA (6th Edition):
Mooya, D. (2015). Evaluation of water use for drought tolerance in Maize (Zea Mays L) Genotypes under deficit irrigation
. (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/3690
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mooya, Dennis. “Evaluation of water use for drought tolerance in Maize (Zea Mays L) Genotypes under deficit irrigation
.” 2015. Thesis, University of Zambia. Accessed April 01, 2020.
http://hdl.handle.net/123456789/3690.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mooya, Dennis. “Evaluation of water use for drought tolerance in Maize (Zea Mays L) Genotypes under deficit irrigation
.” 2015. Web. 01 Apr 2020.
Vancouver:
Mooya D. Evaluation of water use for drought tolerance in Maize (Zea Mays L) Genotypes under deficit irrigation
. [Internet] [Thesis]. University of Zambia; 2015. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/123456789/3690.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mooya D. Evaluation of water use for drought tolerance in Maize (Zea Mays L) Genotypes under deficit irrigation
. [Thesis]. University of Zambia; 2015. Available from: http://hdl.handle.net/123456789/3690
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Ghana
17.
Ouedraogo, N.
Genetic Improvement of Local Sorghum (Sorghum Bicolor L. Moench) Varieties for Drought Tolerance
.
Degree: 2015, University of Ghana
URL: http://ugspace.ug.edu.gh/handle/123456789/8633
► Drought is the major abiotic factor limiting crop production worldwide. Sorghum is one of the most drought tolerant grain crops that have the ability of…
(more)
▼ Drought is the major abiotic factor limiting crop production worldwide. Sorghum is one
of the most
drought tolerant grain crops that have the ability of addressing food insecurity
in semi-arid areas. However, it is exposed recurrently to severe forms of
drought and,
therefore, requires improvement to cope with moisture stress. The present investigation
was undertaken to improve local sorghum varieties for
drought tolerance in Burkina
Faso. A participatory Rural Appraisal was conducted to identify farmers’ constraints and
to determine their preferred sorghum varieties. One hundred and ten accessions,
including improved and introduced materials, were assessed in full irrigated and terminal
drought conditions in an alpha lattice design to identify
drought tolerant and high yielding genotypes. A molecular characterization using 26 SSRs markers was conducted with the same accessions to determine the genetic diversity, genetic differentiation and the level of homozygosity of these accessions. Finally, marker-assisted backcrossing was carried out to introgress stay-green QTLs into four farmers’ preferred varieties. The major constraint limiting sorghum production in Burkina Faso was Striga, a parasiticweed.
Drought was the second most important factor reducing sorghum yield and the most important abiotic constraint. The study revealed that terminal moisture stress was the most frequent type of
drought but has less effect on yield than pre-flowering
drought. Forty seven per cent of farmers rely preferentially on their local landraces. A few preferred improved varieties derived from local landraces, over high yielding exotic (introduced) varieties. Among released varieties, farmers grew more Kapelga in all different climatic zones of the country. There was a strong correlation between grain filling rates, yield under stress, grain number, Stress Tolerance Index (STI) and Geometric Mean Productivity (GMP). This indicates that improvement can be achieved using accessions with high STI and GMP indices. Classification based on yield and its components, divided accessions into three main groups. Grinkan was the highest yielding and most
drought tolerant genotype in the study. A group of high yielding and
drought susceptible accessions were identified including local improved varieties and landraces that performed well under non-stressed conditions and were susceptible to terminal
drought. Low yielding and
drought tolerant accessions were also identified. Genotypes
with high STI indices could be used by farmers to ensure optimal production in
drought
prone areas and in breeding programs. There was low gene diversity of 0.34 compared to previous molecular studies in Burkina Faso. The Fixation index (Fst) value exhibited low genetic differentiation among populations and moderate genetic differentiation between local population and exotic materials. The local accessions have a high level of
homozygosity. Five stay-green QTLs (Stg1, Stg2, Stg3, Stg4 and StgB) were incorporated into four recurrent (Kapelga, Sariaso09,…
Advisors/Committee Members: Sanou, J (advisor), Danquah, E. Y (advisor), Tongoona, P (advisor), Vernon, G (advisor).
Subjects/Keywords: Genetic;
Sorghum;
Drought
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APA ·
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Manager
APA (6th Edition):
Ouedraogo, N. (2015). Genetic Improvement of Local Sorghum (Sorghum Bicolor L. Moench) Varieties for Drought Tolerance
. (Doctoral Dissertation). University of Ghana. Retrieved from http://ugspace.ug.edu.gh/handle/123456789/8633
Chicago Manual of Style (16th Edition):
Ouedraogo, N. “Genetic Improvement of Local Sorghum (Sorghum Bicolor L. Moench) Varieties for Drought Tolerance
.” 2015. Doctoral Dissertation, University of Ghana. Accessed April 01, 2020.
http://ugspace.ug.edu.gh/handle/123456789/8633.
MLA Handbook (7th Edition):
Ouedraogo, N. “Genetic Improvement of Local Sorghum (Sorghum Bicolor L. Moench) Varieties for Drought Tolerance
.” 2015. Web. 01 Apr 2020.
Vancouver:
Ouedraogo N. Genetic Improvement of Local Sorghum (Sorghum Bicolor L. Moench) Varieties for Drought Tolerance
. [Internet] [Doctoral dissertation]. University of Ghana; 2015. [cited 2020 Apr 01].
Available from: http://ugspace.ug.edu.gh/handle/123456789/8633.
Council of Science Editors:
Ouedraogo N. Genetic Improvement of Local Sorghum (Sorghum Bicolor L. Moench) Varieties for Drought Tolerance
. [Doctoral Dissertation]. University of Ghana; 2015. Available from: http://ugspace.ug.edu.gh/handle/123456789/8633
18.
CHIPATU, LILLIAN.
Environmental learning for coping with drought among small scale farmers of Luangwa district,Zambia.
Degree: 2017, University of Zimbabwe
URL: http://dspace.unza.zm/handle/123456789/5477
► Luangwa District in Zambia’s Lusaka province lies within a marginal area that is prone to both drought and floods in the rainy season (Luangwa District…
(more)
▼ Luangwa District in Zambia’s Lusaka province lies within a marginal area that is prone to
both drought and floods in the rainy season (Luangwa District Council, 2007). Despite small
scale farmers of Luangwa District employing various drought coping strategies, drought and
floods continue to adversely affect them in terms of food security and the general livelihood
of the population (Kaminsa, 2008). Although environmental learning for coping with drought
among small scale farmers has not been studied or explored, some scholars have explained
the role that environmental learning plays in coping with environmental hazards (Goulder,
1999; Holdren, 1990). The aim of the study was to examine environmental learning of coping
with drought among small scale farmers of Zambia’s Luangwa District so as to determine its
approapriateness.
To achieve this aim, the study established drought coping strategies among small scale
farmers of Zambia’s Luangwa district. Having done this, an examination of environmental
learning related to such drought coping strategies was done.
The study was a critical realist case study within a setting of qualitative methodologies. A
semi structured interview guide was used on disaster management officers, agriculture
supervisor, town planner and extension officer, while a focus group discussion was conducted
among the small scale farmers. Observations of farming activities on small holdings were
also done.
The study established that small scale farmers of Luangwa District mainly employed
traditional drought coping strategies. Furthermore, the study findings revealed that
environmental learning among small scale farmers was on general farming practices and not
specifically on drought coping. Thus the study findings confirmed literature assertion that
there was superficial environmental learning among small scale farmers.
Finally, the study comes up with a proposed environmental learning programme for drought
coping which may potentially be useful in addressing drought coping challenges among the
small scale farmers of Luangwa District. Thus a major recommendation is for the Ministry of
Agriculture and other stakeholders to introduce environmental learning for drought coping
among small scale farmers.Further, the government of the republic of Zambia needs to
allocate more funds to extension service.
Subjects/Keywords: Drought – Luangwa – Zambia
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Manager
APA (6th Edition):
CHIPATU, L. (2017). Environmental learning for coping with drought among small scale farmers of Luangwa district,Zambia. (Thesis). University of Zimbabwe. Retrieved from http://dspace.unza.zm/handle/123456789/5477
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
CHIPATU, LILLIAN. “Environmental learning for coping with drought among small scale farmers of Luangwa district,Zambia.” 2017. Thesis, University of Zimbabwe. Accessed April 01, 2020.
http://dspace.unza.zm/handle/123456789/5477.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
CHIPATU, LILLIAN. “Environmental learning for coping with drought among small scale farmers of Luangwa district,Zambia.” 2017. Web. 01 Apr 2020.
Vancouver:
CHIPATU L. Environmental learning for coping with drought among small scale farmers of Luangwa district,Zambia. [Internet] [Thesis]. University of Zimbabwe; 2017. [cited 2020 Apr 01].
Available from: http://dspace.unza.zm/handle/123456789/5477.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
CHIPATU L. Environmental learning for coping with drought among small scale farmers of Luangwa district,Zambia. [Thesis]. University of Zimbabwe; 2017. Available from: http://dspace.unza.zm/handle/123456789/5477
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
California State University – Chico
19.
Sidhu, Gaurav.
Drought causes limited productivity of maize: drought tolerant corn hybrid
.
Degree: 2012, California State University – Chico
URL: http://hdl.handle.net/10211.4/452
► Due to drought stress, there is a significant amount of loss in corn yield caused by weather changes such as rising temperatures and the decrease…
(more)
▼ Due to
drought stress, there is a significant amount of loss in corn yield
caused by weather changes such as rising temperatures and the decrease of rainfall. With
the help of new genetic tools, improvements in conventional crop yields have shown
some success over the past several decades. Researchers have found that the native corn
genes allow
drought tolerance by comparing populations and parent lines in the
drought
environment. A managed stress environment (MSE) plays an important role by providing
the researchers an ideal place to manage the heat stress and irrigation water amount. This,
in turn helps, to validate candidate regions and genes by conducting massively parallel
transcript profiling studies. This type of study was performed in the field of research of
drought tolerant corn and project management, which focused on data collection from the
field. This research took place in Woodland, California, with a climate known to be droughtstricken.
It was concluded that modern hybrid seeds have improved in root distribution
and functional stay-green, and that yield in
drought conditions has increased. The same
types of qualities are shown in Optimum Aquamax Hybrid seeds, which are one of the
hybrid seeds released by Pioneer Hi-Bred in 2011. This hybrid showed a five percent increase
in the average yield. As a result, crop yields were shown to increase with the use
of
drought tolerant hybrid seeds.
This Professional Science Masters (PSM) Internship was performed in the areas
of research of corn and trial management. The main focus of the PSM Intern was on
collecting and organizing the data from the fields and on gaining knowledge of how agricultural
research projects are conducted by industry.
Advisors/Committee Members: Brown, David L (advisor).
Subjects/Keywords: Drought;
Corn;
Hybrids
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Manager
APA (6th Edition):
Sidhu, G. (2012). Drought causes limited productivity of maize: drought tolerant corn hybrid
. (Thesis). California State University – Chico. Retrieved from http://hdl.handle.net/10211.4/452
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sidhu, Gaurav. “Drought causes limited productivity of maize: drought tolerant corn hybrid
.” 2012. Thesis, California State University – Chico. Accessed April 01, 2020.
http://hdl.handle.net/10211.4/452.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sidhu, Gaurav. “Drought causes limited productivity of maize: drought tolerant corn hybrid
.” 2012. Web. 01 Apr 2020.
Vancouver:
Sidhu G. Drought causes limited productivity of maize: drought tolerant corn hybrid
. [Internet] [Thesis]. California State University – Chico; 2012. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/10211.4/452.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sidhu G. Drought causes limited productivity of maize: drought tolerant corn hybrid
. [Thesis]. California State University – Chico; 2012. Available from: http://hdl.handle.net/10211.4/452
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
20.
Haig, Heather A.
Diatom-Inferred Changes in Effective Moisture From Gall Lake, Northwestern, Ontario, Over the Past Two Millennia
.
Degree: Biology, 2011, Queens University
URL: http://hdl.handle.net/1974/6542
► The boreal forest of Canada extends across 58% of Canada’s land area providing a large range of ecosystem services including flood control, water filtration, and…
(more)
▼ The boreal forest of Canada extends across 58% of Canada’s land area providing a large range of ecosystem services including flood control, water filtration, and carbon storage. Despite conservation efforts to protect this ecosystem, the boreal region is still under stress from global stressors including climate change. Anthropogenic climate-change is expected to raise temperatures and decrease precipitation over much of the boreal region increasing the duration and magnitude of droughts. This potential change to a more arid climate could have drastic affects on water levels and stream flows across much of the boreal region. Changes in hydrology, as a consequence of anthropogenic climate change, may result in large changes to aquatic ecosystems. To assess the susceptibility of lakes to climate in northwestern Ontario over the past two millennia, sediment cores from a headwater lake were obtained from near-shore cores to reconstruct changes in drought.
The cores were located at a depth where changes in pelagic and benthic diatom assemblages (P: B boundary) were apparent in modern-day sediments because the location has been shown to be susceptible to change. The lake chosen for reconstruction was Gall Lake, a small (surface area = 9 ha, max depth = 18 m, mean depth = 8.5 m), mesotrophic lake (total phosphorus (TP) level of 12.3 μg/L, July 2008), with a gentlysloping eastern basin. This headwater lake in the Winnipeg River Drainage Basin (WRDB) is part of a hydrologically-rich region that is expected to experience increased aridity. Multivariate analysis of diatom assemblages over the past two millennia suggested that the instrumental record does not encompassed the natural variability of this system. The largest decreases in diatom-inferred (DI) depth were synonymous with iii the Medieval Climate Anomaly (MCA), a phenomenon not yet observed this far northeast in North America. The MCA has been proposed as a surrogate for climate change over the next century, therefore the prolonged aridity observed in Gall Lake could aid in the calibration of general circulation models currently used to forecast changes in climate, as well as a scenario that can be used to develop adaptation strategies to future environmental change.
Subjects/Keywords: Drought;
Paleolimnology;
Diatom
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APA (6th Edition):
Haig, H. A. (2011). Diatom-Inferred Changes in Effective Moisture From Gall Lake, Northwestern, Ontario, Over the Past Two Millennia
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/6542
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Haig, Heather A. “Diatom-Inferred Changes in Effective Moisture From Gall Lake, Northwestern, Ontario, Over the Past Two Millennia
.” 2011. Thesis, Queens University. Accessed April 01, 2020.
http://hdl.handle.net/1974/6542.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Haig, Heather A. “Diatom-Inferred Changes in Effective Moisture From Gall Lake, Northwestern, Ontario, Over the Past Two Millennia
.” 2011. Web. 01 Apr 2020.
Vancouver:
Haig HA. Diatom-Inferred Changes in Effective Moisture From Gall Lake, Northwestern, Ontario, Over the Past Two Millennia
. [Internet] [Thesis]. Queens University; 2011. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1974/6542.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Haig HA. Diatom-Inferred Changes in Effective Moisture From Gall Lake, Northwestern, Ontario, Over the Past Two Millennia
. [Thesis]. Queens University; 2011. Available from: http://hdl.handle.net/1974/6542
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
Qiu, Shaoyue.
Improving The Palmer Drought Severity Index By Incorporating Snow And Frozen Ground.
Degree: MS, Atmospheric Sciences, 2013, University of North Dakota
URL: https://commons.und.edu/theses/1470
► Drought causes extensive damage and affects a significant number of people. To quantify the severity of drought and to better monitor drought, drought indices…
(more)
▼ Drought causes extensive damage and affects a significant number of people. To quantify the severity of
drought and to better monitor
drought,
drought indices are necessary. The Palmer
Drought Severity Index (PDSI) has its advantages of comprehensive and taking the characteristics of
drought into concern so that it was regarded as the milestone in the revolution of
drought indices (Heim, 2002). The PDSI has been widely used, tested, and modified since its development in 1965. However, a commonly documented limitation to this index is the lack of consideration for snow and the treatment of ground status. In this study, a simplified snow model is included in the self-calibrated PDSI model, which is run in a monthly time step over the continental United States (CONUS) for the past 32 years (1979 - 2010). In the modified PDSI model, the form of precipitation is based on an air temperature threshold and moisture has been withheld and redistributed into the system based on the accumulation and melt of snow. With the snow processes included, all the model variables (evapotranspiration, soil moisture recharge/loss, surface runoff) decreased in winter and increased in spring melt time and soil moisture remained the same in winter and got recharged in spring, the difference between the soil moisture in the original PDSI model without snow effect and the soil moisture in the PDSI model with snow effect is small. The climatically appropriate precipitation increased more than 200% in northern latitude and mountain
regions in spring melt seasons. The absolute value of moisture departure also decreased in winter and increased in summer, which means the inclusion of snow processes made the moisture departure increase during wet condition and decrease for dry condition (varies more). Inclusion of the snow model also allows the PDSI to better capture spring flooding events, which are caused by snowmelt; monitoring
drought events also has been improved due to the changes in duration factor for the modified model with snow processes. Finally, the general moisture conditions as well as the trend of moisture change have been examined using both the original model and the modified model including snow. Both models show similar characteristics over the CONUS for the past three decades. The inclusion of the snow model does not qualitatively change these results, and has little effect on the spatial comparability of the index. Effect of frozen soil has also been examined. In this study, this effect is simply tested by shutting down infiltration when ground is frozen. Due to the time lag between ground status and air temperature (which is the determinant for the calculated snowmelt rate), and also the different spatial resolution for these two data sets, most of the spring snowmelt in western US, especially the northern Rocky Mountain regions didn't infiltrate the soil system and became surface runoff. This loss of moisture caused the soil moisture in those regions decreased from a climate mean 35cm to…
Advisors/Committee Members: Xiquan Dong.
Subjects/Keywords: Drought; Drought Indices; Palmer Drought Severity Index; Snow processes
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APA (6th Edition):
Qiu, S. (2013). Improving The Palmer Drought Severity Index By Incorporating Snow And Frozen Ground. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/1470
Chicago Manual of Style (16th Edition):
Qiu, Shaoyue. “Improving The Palmer Drought Severity Index By Incorporating Snow And Frozen Ground.” 2013. Masters Thesis, University of North Dakota. Accessed April 01, 2020.
https://commons.und.edu/theses/1470.
MLA Handbook (7th Edition):
Qiu, Shaoyue. “Improving The Palmer Drought Severity Index By Incorporating Snow And Frozen Ground.” 2013. Web. 01 Apr 2020.
Vancouver:
Qiu S. Improving The Palmer Drought Severity Index By Incorporating Snow And Frozen Ground. [Internet] [Masters thesis]. University of North Dakota; 2013. [cited 2020 Apr 01].
Available from: https://commons.und.edu/theses/1470.
Council of Science Editors:
Qiu S. Improving The Palmer Drought Severity Index By Incorporating Snow And Frozen Ground. [Masters Thesis]. University of North Dakota; 2013. Available from: https://commons.und.edu/theses/1470
University of South Carolina
22.
Altman, Ekaterina Negodyaeva.
Drought Indices In Decision-Making Process of Drought Management.
Degree: M.E.E.R.M., Earth and Ocean Sciences, 2013, University of South Carolina
URL: https://scholarcommons.sc.edu/etd/2320
► Drought indices are one of the most important elements of an effective drought monitoring and early warning system. They help to characterize drought and…
(more)
▼ Drought indices are one of the most important elements of an effective
drought monitoring and early warning system. They help to characterize
drought and guide appropriate responses to reduce
drought impacts.
Drought indicators are more useful than raw data in decision-making process, even though each index has specific use and limited by its strengths and weaknesses. The literature review showed the evaluation of
drought conditions by decision-makers as an important issue, but so far no research has been done to understand how decision-makers use diverse and often conflicting values of
drought indices to make
drought declarations. This research studies how
drought declarations by decision-makers relate to
drought indices to measure past two droughts in South Carolina.
The South Carolina
Drought Response Committee (DRC), the state's major
drought decision-making body, evaluates climate data and seven
drought indices to issue
drought status declarations for each county of the state. The case of South Carolina's
drought management program is particular beneficial because the state has one of the largest number of
drought indicators among other state-level programs in the nation. My research determines similarities and differences in measures of
drought between the DRC and multiple
drought indices, such as Palmer
Drought Severity Index (PDSI), Palmer Hydrological
Drought Index (PHDI), Z-index, Standardized Precipitation Index (SPI), Crop Moisture Index (CMI), Keetch-Byrum
Drought Index (KBDI) and the U.S.
Drought Monitor (USDM). Nine years of monthly values of each index are compared with the DRC declarations in evaluating
drought onset, duration, severity and recovery.
The results show that a cumulative approach is more useful in measuring
drought conditions rather than one or two indices. The DRC measures
drought onset 3-4 months later than the majority of indices. The
drought duration of the DRC for overall study period is similar to most
drought indices and longer in comparison to
drought indices within two
drought periods 2000-2002 and 2007-2008. The severity measured by the DRC typically has more moderate months than other indices. The DRC consistently identifies
drought recovery after
drought indices and tends to agree with
drought indices in measuring
drought recovery more often than in measuring
drought onset.
This research aims to benefit the decision-making process for
drought and water managers, government officials, and stakeholders, as it informs
drought assessment in the use of major
drought indices. This research is an assessment of
drought indicators for policy purposes and can be used in advisement for
drought triggers in other regions of the country and the world. Effective use of
drought indices in decision-making process enhances proactive
drought management policies (risk management approaches) and helps to reduce
drought impacts with an ultimate goal of creating
drought resilient societies
Advisors/Committee Members: Kirstin Dow.
Subjects/Keywords: Earth Sciences; Physical Sciences and Mathematics; drought; drought index; drought management; South Carolina
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APA ·
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Manager
APA (6th Edition):
Altman, E. N. (2013). Drought Indices In Decision-Making Process of Drought Management. (Masters Thesis). University of South Carolina. Retrieved from https://scholarcommons.sc.edu/etd/2320
Chicago Manual of Style (16th Edition):
Altman, Ekaterina Negodyaeva. “Drought Indices In Decision-Making Process of Drought Management.” 2013. Masters Thesis, University of South Carolina. Accessed April 01, 2020.
https://scholarcommons.sc.edu/etd/2320.
MLA Handbook (7th Edition):
Altman, Ekaterina Negodyaeva. “Drought Indices In Decision-Making Process of Drought Management.” 2013. Web. 01 Apr 2020.
Vancouver:
Altman EN. Drought Indices In Decision-Making Process of Drought Management. [Internet] [Masters thesis]. University of South Carolina; 2013. [cited 2020 Apr 01].
Available from: https://scholarcommons.sc.edu/etd/2320.
Council of Science Editors:
Altman EN. Drought Indices In Decision-Making Process of Drought Management. [Masters Thesis]. University of South Carolina; 2013. Available from: https://scholarcommons.sc.edu/etd/2320
Universidade do Rio Grande do Sul
23.
Albuquerque, Tatiana Máximo Almeida.
Estudo dos processos de gestão de seca : aplicação no estado do Rio Grande do Sul.
Degree: 2010, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/31769
► A aplicação de gestão de riscos em eventos extremos como a seca é um fator primordial para redução de impactos sociais, além de auxiliar na…
(more)
▼ A aplicação de gestão de riscos em eventos extremos como a seca é um fator primordial para redução de impactos sociais, além de auxiliar na utilização racional dos recursos naturais e financeiros. Na busca da eficiência da minimização dos efeitos da seca, vários países têm investido em estudos que utilizam índices para detectá-la, quantificá-la e monitorá-la. Entre os índices mais conhecidos têm-se o Índice Padronizado de Precipitação (SPI), que avalia a variação da precipitação em várias escalas de tempo, e o Índice de Aridez (IA), utilizado pela UNESCO para caracterização climática. Aliado a estes índices são desenvolvidos planos de gestão de riscos da seca. No Brasil a política de secas sempre foi voltada a gestão de crises, resultando num problema crônico de grandes impactos no Nordeste e, recentemente, também no Rio Grande do Sul (RS), como nos anos de 2004 e 2005. Nesta época, mais de 450 municípios decretaram situação de emergência devido à seca e houve a maior quebra de safra da história. Esta pesquisa objetivou avaliar a metodologia de gestão de secas utilizada pela Defesa Civil – RS, propondo a utilização de sistema de alerta baseado no SPI e IA e a adoção de um sistema de gestão de riscos fundamentado na avaliação, previsão e planejamento, composto de critérios objetivos na decretação de situação de emergência e estado de calamidade pública, além de diretrizes para um plano de ações para seca. Na comparação dos resultados dos índices de seca com as decretações de situação de emergência devido à seca no período de 1991 a 2005, o número de coincidências foi bastante baixo. Além disso, as regiões secas detectadas pelos índices de seca foram diferentes das regiões de maiores freqüências de decretações. Através desta análise pode-se concluir que a metodologia utilizada atualmente para gestão de secas não é eficiente. Um sistema de alerta para secas de curto prazo (agrícola) e longo prazo (hidrológica), baseado nos índices IA (mensal e trimestral) e SPI (anual), respectivamente, foi proposto e simulado. O IA identificou a região sul do RS como a mais propícia a períodos secos no estado, já o SPI identificou a região nordeste. Através dos resultados pôde-se concluir que os dois índices identificaram os mesmos períodos secos (meses e anos), porém, devido às regiões detectadas, o IA foi o que melhor representou a realidade climática do estado. A partir destes resultados foi proposta uma reformulação na metodologia da Defesa Civil considerando-se o sistema de alerta e análises de dados regionais para identificar as regiões mais vulneráveis a períodos secos.
The risk management in hazards like drought is very important to reduce social impacts, and to rationalize the natural and financial resources. To minimize the drought impacts, several countries take into account some indexes to its detection, quantification and evaluation. The Standardized Precipitation Index (SPI) is very applied around the world, and evaluates the variation of the precipitation in some timescale. Also, the Aridity Index (AI) is applied by…
Advisors/Committee Members: Mendes, Carlos André Bulhões.
Subjects/Keywords: Seca; Drought; Risk management; Riscos ambientais; Gestão ambiental; State of emergency; Drought indices; Drought plan
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APA (6th Edition):
Albuquerque, T. M. A. (2010). Estudo dos processos de gestão de seca : aplicação no estado do Rio Grande do Sul. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/31769
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Albuquerque, Tatiana Máximo Almeida. “Estudo dos processos de gestão de seca : aplicação no estado do Rio Grande do Sul.” 2010. Thesis, Universidade do Rio Grande do Sul. Accessed April 01, 2020.
http://hdl.handle.net/10183/31769.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Albuquerque, Tatiana Máximo Almeida. “Estudo dos processos de gestão de seca : aplicação no estado do Rio Grande do Sul.” 2010. Web. 01 Apr 2020.
Vancouver:
Albuquerque TMA. Estudo dos processos de gestão de seca : aplicação no estado do Rio Grande do Sul. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2010. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/10183/31769.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Albuquerque TMA. Estudo dos processos de gestão de seca : aplicação no estado do Rio Grande do Sul. [Thesis]. Universidade do Rio Grande do Sul; 2010. Available from: http://hdl.handle.net/10183/31769
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Dalhousie University
24.
Karunatilleke, Nadun.
MITIGATION OF DROUGHT STRESS IN TOMATO WITH ASCOPHYLLUM
NODOSUM (L.) LE JOL. EXTRACTS.
Degree: MS, Faculty of Agriculture, 2014, Dalhousie University
URL: http://hdl.handle.net/10222/53945
► Growth and development of a plant can be affected due to various biotic and abiotic stresses such as water, salinity, frost and pathogens. Application of…
(more)
▼ Growth and development of a plant can be affected due
to various biotic and abiotic stresses such as water, salinity,
frost and pathogens. Application of seaweeds and their extracts to
mitigate plant stresses in agriculture is one of the promising
strategies. However, there is less evidence associated with seaweed
extract application on
drought stress management. In the current
study, investigate the effect of brown alga Ascophyllum nodosum
(L.) Le Jolis. extract (ANE) to mitigate
drought stress in tomato
plants using physiological, biochemical and molecular biological
aspects. The results indicated a rapid recovery (85% compared to
30-40% in controls) of ANE treated plants. It also evident high
stomatal conductance , high plant water potential and less wilting
in ANE treated plants over controls. Moreover, ANE treatments
helped in lowering antioxidant enzyme activities, low lipid
peroxidation, low proline accumulation and the lower expression of
stress responsive genes under the stress. In conclusion, it is
evident that ANE treated plants perform well and recover well under
drought stress compare to control plants.
Advisors/Committee Members: Dr. Junzeng Zhang (external-examiner), Dr.Dian Patterson (graduate-coordinator), Dr.Gefu Wang-Pruski (thesis-reader), Dr. Yousef Papadopolous (thesis-reader), Dr. Balakrishnan Prithiviraj (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: Drought stress; Tomato; Ascophyllum nodosum
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APA (6th Edition):
Karunatilleke, N. (2014). MITIGATION OF DROUGHT STRESS IN TOMATO WITH ASCOPHYLLUM
NODOSUM (L.) LE JOL. EXTRACTS. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/53945
Chicago Manual of Style (16th Edition):
Karunatilleke, Nadun. “MITIGATION OF DROUGHT STRESS IN TOMATO WITH ASCOPHYLLUM
NODOSUM (L.) LE JOL. EXTRACTS.” 2014. Masters Thesis, Dalhousie University. Accessed April 01, 2020.
http://hdl.handle.net/10222/53945.
MLA Handbook (7th Edition):
Karunatilleke, Nadun. “MITIGATION OF DROUGHT STRESS IN TOMATO WITH ASCOPHYLLUM
NODOSUM (L.) LE JOL. EXTRACTS.” 2014. Web. 01 Apr 2020.
Vancouver:
Karunatilleke N. MITIGATION OF DROUGHT STRESS IN TOMATO WITH ASCOPHYLLUM
NODOSUM (L.) LE JOL. EXTRACTS. [Internet] [Masters thesis]. Dalhousie University; 2014. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/10222/53945.
Council of Science Editors:
Karunatilleke N. MITIGATION OF DROUGHT STRESS IN TOMATO WITH ASCOPHYLLUM
NODOSUM (L.) LE JOL. EXTRACTS. [Masters Thesis]. Dalhousie University; 2014. Available from: http://hdl.handle.net/10222/53945
University of Alberta
25.
Ramadoss, Anupreeti.
Effects of drought on Eleusine coracana (L.) Gaertn. (finger
millet) and identification of microsatellite markers.
Degree: MS, Department of Biological Sciences, 2014, University of Alberta
URL: https://era.library.ualberta.ca/files/h702q764w
► Finger millet (Eleusine coracana (L.) Gaertn.) is a crop with high nutritional profile cultivated mainly in developing countries. It is an allotetraploid (2n= 4x= 36…
(more)
▼ Finger millet (Eleusine coracana (L.) Gaertn.) is a
crop with high nutritional profile cultivated mainly in developing
countries. It is an allotetraploid (2n= 4x= 36 chromosomes), that
belongs to the Poaceae family and has a genome size of 2509 Mbp.
Drought is one amongst other abiotic stresses limiting a plant’s
growth and productivity. In order to better understand the
physiological responses of finger millet to drought, 12 parameters
were studied by subjecting plants to water withholding at 26 DAS
and imparting water stress for 6 days. Analyzing control plants in
parallel indicated that IE 7079 was the most sensitive accession
and IE 5091 was the most tolerant accession to water withholding.
83 accessions of finger millet obtained from ICRISAT was genotyped
using 31 polymorphic simple sequence repeats (SSRs) identified from
transcript assemblies. A total of 152 alleles were generated by
these 31 SSRs, with a mean of 4.9 alleles per locus and mean
polymorphism information content (PIC) of 0.49 Cluster analysis of
these accessions showed considerable genetic variation in the
varieties from different geographical origins. Identified
polymorphic SSRs can be used to further expand the linkage map of
finger millet.
Subjects/Keywords: Drought; SSR Markers; Finger Millet
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APA (6th Edition):
Ramadoss, A. (2014). Effects of drought on Eleusine coracana (L.) Gaertn. (finger
millet) and identification of microsatellite markers. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/h702q764w
Chicago Manual of Style (16th Edition):
Ramadoss, Anupreeti. “Effects of drought on Eleusine coracana (L.) Gaertn. (finger
millet) and identification of microsatellite markers.” 2014. Masters Thesis, University of Alberta. Accessed April 01, 2020.
https://era.library.ualberta.ca/files/h702q764w.
MLA Handbook (7th Edition):
Ramadoss, Anupreeti. “Effects of drought on Eleusine coracana (L.) Gaertn. (finger
millet) and identification of microsatellite markers.” 2014. Web. 01 Apr 2020.
Vancouver:
Ramadoss A. Effects of drought on Eleusine coracana (L.) Gaertn. (finger
millet) and identification of microsatellite markers. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2020 Apr 01].
Available from: https://era.library.ualberta.ca/files/h702q764w.
Council of Science Editors:
Ramadoss A. Effects of drought on Eleusine coracana (L.) Gaertn. (finger
millet) and identification of microsatellite markers. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/h702q764w
Texas A&M University
26.
Bista, Ankit.
River/Reservoir System Water Availability Modeling Support for Drought Management.
Degree: 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155724
► The Water Availability Modeling (WAM) System maintained by the Texas Commission on Environmental Quality (TCEQ) consists of the Water Rights Analysis Package (WRAP) and datasets…
(more)
▼ The Water Availability Modeling (WAM) System maintained by the Texas Commission on Environmental Quality (TCEQ) consists of the Water Rights Analysis Package (WRAP) and datasets for all the river basins of Texas. The modeling system is used to support long-term regional and statewide planning and evaluation of water right permit applications. The research is designed to explore and improve WRAP/WAM capabilities as a decision-support tool for
drought management.
The WRAP/WAM model for the Colorado River Basin is applied in this research in both long-term planning and short-term conditional reliability modeling (CRM) modes. A strategy using iterative long-term simulations is developed for modeling water management plans that combine interruptible and firm water supply commitments. The methodology is tested and demonstrated by application to the LCRA System. Improvements in water supply reliabilities provided by off-channel storage are also investigated in the simulation study. The research is designed to explore and improve modeling capabilities in general, not to support specific decisions regarding water management in this particular river basin.
CRM features in WRAP provide short-term storage frequency and supply reliability analyses conditioned on preceding reservoir storage and can be employed as a decision-support tool for water management during
drought or operational planning studies for preparing for future
drought. The research explores alternative methods and combinations of options for performing various CRM tasks and develops several additional new options.
Climate teleconnection patterns,
drought indices, and flow persistence are investigated from the perspective of potential improvements to WRAP/WAM CRM capabilities. The literature regarding climate cycles and metrics for identifying these cycles is reviewed. Correlation analyses are performed to analyze the relationship between flows at selected sites on the Colorado River and various climate cycle indices. The correlations are generally found to be fairly weak.
The Rapid Intervention Program (RIP) is designed for improving on-farm irrigation management strategies. A new interactive web interface tool being developed by other researchers at Texas A&M University, called the Irrigation Water-Use Efficiency Maximizer (IWEM), will link WRAP with RIP. WRAP CRM methods are tested and compared to determine the optimal combination of options for use with the IWEM platform.
Advisors/Committee Members: Wurbs, Ralph A (advisor), Cahill, Anthony T (committee member), Singh, Vijay P (committee member).
Subjects/Keywords: Drought Managment; Conditional Reliability Modeling
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APA (6th Edition):
Bista, A. (2015). River/Reservoir System Water Availability Modeling Support for Drought Management. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155724
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bista, Ankit. “River/Reservoir System Water Availability Modeling Support for Drought Management.” 2015. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/155724.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bista, Ankit. “River/Reservoir System Water Availability Modeling Support for Drought Management.” 2015. Web. 01 Apr 2020.
Vancouver:
Bista A. River/Reservoir System Water Availability Modeling Support for Drought Management. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/155724.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bista A. River/Reservoir System Water Availability Modeling Support for Drought Management. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155724
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
27.
Dewey, Daniel Wade.
Physiological and genetic control of water stress tolerance in zoysiagrass.
Degree: 2006, Texas A&M University
URL: http://hdl.handle.net/1969.1/3172
► Significant cultivar difference in many water stress responses of zoysiagrass (Zoysia japonica (Steud.) and Zoysia matrella (L.) Merr.) are shown in this study. Of the…
(more)
▼ Significant cultivar difference in many water stress responses of zoysiagrass
(Zoysia japonica (Steud.) and Zoysia matrella (L.) Merr.) are shown in this study. Of the
four cultivars, Palisades was the most water stress tolerant, had the most negative turgor
loss point, and leaf rolled after loss of full turgor pressure. On the other end of the
spectrum, Diamond was the least water stress tolerant, had the lowest full turgor pressure,
the least negative turgor loss point, and leaf rolled at full turgor. Differences between
Diamond, Cavalier, Palisades, and DALZ 8504 in leaf rolling, loss of full turgor, water
release curve parameters, root characteristics and gene expression make zoysiagrass a
prime candidate for further investigation into the mechanisms of water stress
avoidance/tolerance. Enhanced antioxidant activity and stomatal control, along with root
characteristics, most likely explain the cultivar difference in water stress tolerance of
zoysiagrass. Palisades and DALZ 8504 maintained full turgor for significantly longer
than Diamond and Cavalier, which may be associated with root characteristics and/or
enhanced stomatal control as only those two cultivars showed enhanced expression of a
stomatal control gene (phospholipase D). The apparent response (most apparent in turgid
weight/dry weight ratios (TWDW)) of well watered plants to water stressed neighbor plants will likely be the most novel finding of this study. Well watered zoysiagrass and
Kentucky bluegrass responded to water stressed neighbors by reducing TWDW.
Significant increases in gene expression of a systemin degrading enzyme and of an
integral membrane protein (signal receptor) were also observed in well watered plants.
Results from this study indicate that this phenomenon is occurring and expose a dearth in
scientific understanding that must be filled. Improving water stress tolerance through
breeding for parameters like those discussed in this paper (delayed leaf rolling or loss of
full turgor, enhanced stomatal control, enhanced antioxidant activity, deep rooting
characteristics, etc.) may very likely produce turfgrasses that can survive and maintain
desired aesthetic qualities using significantly less water.
Advisors/Committee Members: Binzel, Marla L. (advisor), White, Richard H. (advisor), Engelke, Milt C. (committee member), Hays, Dirk B. (committee member).
Subjects/Keywords: Zoysiagrass; Drought
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APA (6th Edition):
Dewey, D. W. (2006). Physiological and genetic control of water stress tolerance in zoysiagrass. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3172
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dewey, Daniel Wade. “Physiological and genetic control of water stress tolerance in zoysiagrass.” 2006. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/3172.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dewey, Daniel Wade. “Physiological and genetic control of water stress tolerance in zoysiagrass.” 2006. Web. 01 Apr 2020.
Vancouver:
Dewey DW. Physiological and genetic control of water stress tolerance in zoysiagrass. [Internet] [Thesis]. Texas A&M University; 2006. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/3172.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dewey DW. Physiological and genetic control of water stress tolerance in zoysiagrass. [Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3172
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
28.
Myoung, Boksoon.
Interannual variability of summer precipitation in Texas and its implication to summer drought.
Degree: 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1422
► Since Texas normally receives most of its precipitation in the warm season, precipitation deficits in summertime may bring serious agricultural and hydrological disasters. While the…
(more)
▼ Since Texas normally receives most of its precipitation in the warm season, precipitation deficits in summertime may bring serious agricultural and hydrological disasters. While the underlying physical processes of summer precipitation deficit and
drought are unclear, they can be understood in terms of convective instability. This research is designed to investigate how convective instability influences monthly mean precipitation in Texas in the summertime and to examine the modulation of convective instability and precipitation by upper-level circulations, soil moisture, vertical motion, and low-tropospheric warm air transport using NCEP/NCAR reanalysis data. Statistical approaches including correlation analysis, multiple linear regression analysis and back trajectory analysis were used to reveal the underlying dynamics of their linkage and causality. The results show that warming at 700 mb and surface dryness result in excessive convective inhibition (CIN), leading to precipitation deficits on a monthly time-scale. Temperature at 700 mb (Tlt) and surface dewpoint have little correlation suggesting different processes contribute to warming at 700 mb and surface dryness, respectively. Correlation analysis among the surface variables emphasizes the role of soil moisture on the dewpoint and thermodynamics at the surface. Back trajectory analysis indicates that a significant contributor to warming at 700 mb is the inversion caused by warm air transport from the Rocky Mountains and the Mexican Plateau where the surface potential temperature is greater than 307.5K rather than by subsidence. It was found that downward motion and warm air transport are enhanced in Texas when upper-level anticyclonic circulation develops in the southern US. Upper-level anticyclonic circulations in the southern US strongly affect Texas summertime precipitation by modulating the principal processes as follows. They increase CIN not only by enhancing warm air transport from the high terrain but also by suppressing occurrence of disturbances. The resulting reduced precipitation and dry soil significantly modulate surface conditions, which elevates CIN and decreases precipitation. The aforementioned chain-reaction of upper-level anticyclone influences can be understood in the context of CIN.
Advisors/Committee Members: Nielsen-Gammon, John (advisor), Carey, Larry (committee member), Chang, Ping (committee member), North, Gerald (committee member), Saravanan, Ramalingam (committee member), Schumacher, Courtney (committee member).
Subjects/Keywords: Texas; drought; precipitation variability
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APA (6th Edition):
Myoung, B. (2009). Interannual variability of summer precipitation in Texas and its implication to summer drought. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1422
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Myoung, Boksoon. “Interannual variability of summer precipitation in Texas and its implication to summer drought.” 2009. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-1422.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Myoung, Boksoon. “Interannual variability of summer precipitation in Texas and its implication to summer drought.” 2009. Web. 01 Apr 2020.
Vancouver:
Myoung B. Interannual variability of summer precipitation in Texas and its implication to summer drought. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1422.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Myoung B. Interannual variability of summer precipitation in Texas and its implication to summer drought. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1422
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
29.
Annon, Ali Hani Hamza.
Overexpression of Tobacco Osmotin Protein in Carrot (Daucus carota L.) to Enhance Drought Tolerance.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148151
► Lack of water is one of the most significant issues that already threaten world agriculture as many countries are unable to meet the demand for…
(more)
▼ Lack of water is one of the most significant issues that already threaten world agriculture as many countries are unable to meet the demand for water to grow the crops. To make matters worse, the water availability is expected to fall by half by 2050, thus severely restricting agriculture production. Genetic engineering of crops to enhance their tolerance to such unfavorable environment represents one of the few approaches that can help us address this problem. Osmotin and osmotin-like proteins are stress proteins, belonging to the plant PR-5 group of proteins, which induced in response to various types of biotic and abiotic stresses in several plant species. Carrot plants were transformed with tobacco osmotin gene that encodes a protein lacking 20 amino-acid sequence at the C terminal end under the control of CaMV 35S promoter using the Agrobacterium-mediated transformation method. The gene integration and expression were confirmed by Southern and Western blot analyses and the transgenic plants were evaluated for their ability to tolerate
drought stress. Under
drought conditions, transformants exhibited slower rates of wilting compared to the wild-type and gained the ability to recover faster than their untransformed counterparts when the
drought stress was alleviated. Under water stress, transformants showed lower levels of H2O2 accumulation, reduced lipid peroxidation and electrolyte leakage, and higher leaf water content. Taken together with some earlier reports, our results provide additional evidence for the protective ability of tobacco osmotin protein against
drought stress and suggest a possible means to achieve tolerance against a serious type of abiotic stress.
Advisors/Committee Members: Crosby, Kevin M (advisor), Rathore, Keerti S (advisor), Lombardini, Leonardo (committee member).
Subjects/Keywords: transformation; Agrobacterium; drought; Osmotin
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APA (6th Edition):
Annon, A. H. H. (2012). Overexpression of Tobacco Osmotin Protein in Carrot (Daucus carota L.) to Enhance Drought Tolerance. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148151
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Annon, Ali Hani Hamza. “Overexpression of Tobacco Osmotin Protein in Carrot (Daucus carota L.) to Enhance Drought Tolerance.” 2012. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/148151.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Annon, Ali Hani Hamza. “Overexpression of Tobacco Osmotin Protein in Carrot (Daucus carota L.) to Enhance Drought Tolerance.” 2012. Web. 01 Apr 2020.
Vancouver:
Annon AHH. Overexpression of Tobacco Osmotin Protein in Carrot (Daucus carota L.) to Enhance Drought Tolerance. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/148151.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Annon AHH. Overexpression of Tobacco Osmotin Protein in Carrot (Daucus carota L.) to Enhance Drought Tolerance. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148151
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
30.
Terhune, Austin Cates.
Phenotyping Drought Tolerance in Cotton (Gossypium hirsutum, L.).
Degree: 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152685
► Cotton plant breeders need well-defined phenotypic parameters by which they can select drought tolerant lines as well as correlate phenotypes to allelic polymorphisms in the…
(more)
▼ Cotton plant breeders need well-defined phenotypic parameters by which they
can select
drought tolerant lines as well as correlate phenotypes to allelic polymorphisms
in the cotton genome. Soil-moisture availability is usually the most limiting factor for
cotton crop productivity, especially in Texas. Characteristics of roots logically play an
important role in determining the response of plants to limited soil moisture.
The objectives of this study were to develop and refine techniques that could be
used by plant breeders to phenotype plants?
drought tolerance. Approaches include using
a Trimble GreenSeeker?, to identify individual and progeny rows with enhanced
photosynthetic capabilities in the presence of
drought, leaf canopy temperatures under
drought conditions, and measurement of root parameters in growth tubes in a
greenhouse. Results from these experiments were related to yield performance in field
trials at three locations in 2013.
Several conclusions can be drawn from this study. First, Normalized Difference
Vegetative Index and leaf temperature are rapid and reliable tools to evaluate plant
health. The utility of these tools hinges upon timing of data collection, but they clearly
demonstrated the propensity to differentiate phenotypic differences. Secondly,
evaluation of root systems in growing tubes in a greenhouse is probably an ineffective
method of characterizing
drought tolerance potential since the growing conditions are
radically different from what a plant would encounter in a field environment. Examining
roots with this system would likely yield significant differences among plant species, but
within upland cotton, it would be difficult to determine differences among genotypes.
Ultimately the best determinant of
drought tolerance is performance testing in droughty
conditions because it encompasses most of the contributing factors that induce
drought
stress and measures the cotton plant?s inherent ability to recover and compensate in
response to rainfall through the course of a growing season.
Advisors/Committee Members: Hague, Steve (advisor), Smith, Wayne (committee member), Morgan, Gaylon (committee member).
Subjects/Keywords: Drought; Upland Cotton; Phenotyping
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APA (6th Edition):
Terhune, A. C. (2014). Phenotyping Drought Tolerance in Cotton (Gossypium hirsutum, L.). (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Terhune, Austin Cates. “Phenotyping Drought Tolerance in Cotton (Gossypium hirsutum, L.).” 2014. Thesis, Texas A&M University. Accessed April 01, 2020.
http://hdl.handle.net/1969.1/152685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Terhune, Austin Cates. “Phenotyping Drought Tolerance in Cotton (Gossypium hirsutum, L.).” 2014. Web. 01 Apr 2020.
Vancouver:
Terhune AC. Phenotyping Drought Tolerance in Cotton (Gossypium hirsutum, L.). [Internet] [Thesis]. Texas A&M University; 2014. [cited 2020 Apr 01].
Available from: http://hdl.handle.net/1969.1/152685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Terhune AC. Phenotyping Drought Tolerance in Cotton (Gossypium hirsutum, L.). [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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