Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(carbon stock assessment). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Lincoln University

1. Welsch, Johannes. Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand.

Degree: 2016, Lincoln University

Increasing interest in characterising carbon dynamics in the agricultural landscape has been driven by the clear need for greenhouse gas mitigation strategies in response to global climate change. However, little quantitative information is available about carbon stocks and processes in agro-ecosystems. Better understanding of carbon stocks and processes is of particular importance in New Zealand, where farmland occupies large areas across the country and ongoing change in farming practices, land management and intensification are affecting carbon stocks and processes and ultimately, agricultural sustainability. This study aimed to quantify and understand variation in above- and below-ground carbon stocks and processes in shelterbelts and paddocks at multiple scales within the agro-ecosystem of Canterbury, New Zealand. In an initial pilot study across four farms showed that variability in above- and below-ground carbon stocks among-farms was smaller than between shelterbelt and paddocks. Using this knowledge to determine appropriate sampling intensity, I quantified carbon stocks and processes within shelterbelts across 34 farms, focussing particularly on understanding how within-shelterbelt-scale (e.g. soil moisture, pH), shelterbelt-scale (e.g. shelterbelt type, age, and tree biomass), farm-scale (e.g. land use) and landscape-scale (e.g. soil type) factors was related to variability of these variables. Total above- and below-ground carbon pools in shelterbelts were similar for exotic and native shelterbelts (152.6 ± 131 t C ha-1 and 110.8 ± 128 t C ha-1, respectively [mean ± standard errors]), although native shelterbelts were on average half the age of exotic shelterbelts (16 and 27 years, respectively). The above-ground biomass carbon pool represented about 62% and soil carbon pool 33% in both native and exotic shelterbelts. Most variability in carbon stocks was explained at the shelterbelt scale by shelterbelt type, age and size, whereas farm scale played a minor role and soil type was unimportant. Carbon cycle processes varied primarily at the shelterbelt and paddock level. Leaf litter decomposition and microbial activity were twice as high and invertebrates were more active in native shelterbelts compared to exotic shelterbelts, and variability in these indicators were best explained by within-shelterbelt factors (e.g., soil moisture, pH, organic and labile carbon) and shelterbelt characteristics (age, biomass, and vegetation type). Therefore, above-ground shelterbelt-scale factors drive carbon cycle process indicator rates and biological activity in the Canterbury agro-ecosystem, rather than land use or landscape factors. These field data were used in GIS-based spatial carbon model which expored and evaluated a number of agricultural land use, cover and management scenarios and their impact on soil carbon stocks over the enxt 10 years (2014 – 2024) in combination with quantifying the amount of shelterbelt area needed to offset the potential soil carbon loss. While the model default settings predicted an…

Subjects/Keywords: carbon cycle; GIS; agriculture; variability; carbon stock; landscape modelling; variance partitioning; Canterbury; agroecology; native plants; shelterbelt; scale; 050102 Ecosystem Function; 070301 Agro-ecosystem Function and Prediction; 050204 Environmental Impact Assessment

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Welsch, J. (2016). Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand. (Thesis). Lincoln University. Retrieved from http://hdl.handle.net/10182/7784

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):

Welsch, Johannes. “Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand.” 2016. Thesis, Lincoln University. Accessed March 07, 2021. http://hdl.handle.net/10182/7784.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Welsch, Johannes. “Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand.” 2016. Web. 07 Mar 2021.

Vancouver:

Welsch J. Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand. [Internet] [Thesis]. Lincoln University; 2016. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10182/7784.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Welsch J. Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand. [Thesis]. Lincoln University; 2016. Available from: http://hdl.handle.net/10182/7784

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Swedish University of Agricultural Sciences

2. Guedes, Benard. Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique.

Degree: 2017, Swedish University of Agricultural Sciences

In Mozambique and neighbouring countries, deforestation and degradation of miombo forests are counteracted by new plantations of fast growing species and conservation of natural woodlands, activities supported by the REDD+ mechanism. The aim of this thesis was to examine the impacts of plantations of Pinus and Eucalyptus compared with mountain miombo forest on carbon stocks and dynamics in soil and tree biomass. The thesis also aimed to develop allometric biomass equations for lowland miombo forest to estimate aboveground tree biomass at the landscape scale. The entire study area was located within the Beira development corridor region, central Mozambique. Study plots of mountain miombo and 34-year-old first rotation plantations of Pinus taeda and Eucalyptus grandis were selected on three study sites in the Western highland of the Manica province to investigate total ecosystem carbon and nitrogen stocks in soil, litter and biomass. Tree biomass was estimated using allometric equations found in the literature. Total ecosystem carbon stocks in soils, litter layer and biomass, and net ecosystem production were all significantly higher in P. taeda and E. grandis plantations than in adjacent mountain miombo forest. Net primary production were higher in P. taeda and E. cloeziana plantations than in adjacent mountain miombo forest. Total soil nitrogen stocks in the topsoil layers were also significantly higher in plantation stands. The higher soil stocks of carbon and nitrogen could be explained to some extent with higher leaf litterfall, from Q-model predictions. However, higher root litter production in plantation stands was probably an additional important contribution to the measured higher soil organic carbon stocks. Two biomass functions were developed for estimating aboveground tree biomass of mixed-species lowland miombo forest. One equation was developed for estimating biomass based on stem diameter at breast height (1.3 m). The other equation was developed for estimating biomass based on stem diameter at stump height, to make it possible to also estimate losses of biomass in high exploitation areas of miombo woodlands.

Subjects/Keywords: biomass; Brachystegia; Eucalyptus; Pinus taeda; forest litter; forest soils; carbon stock assessment; environmental impact assessment; survey methods; Mozambique; Biomass equation; Brachystegia spiciformis; Eucalyptus grandis; Eucalyptus cloeziana; Pinus taeda; Fine root production; Litterfall; Net primary production; Soil carbon

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Guedes, B. (2017). Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique. (Doctoral Dissertation). Swedish University of Agricultural Sciences. Retrieved from https://pub.epsilon.slu.se/14737/

Chicago Manual of Style (16th Edition):

Guedes, Benard. “Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique.” 2017. Doctoral Dissertation, Swedish University of Agricultural Sciences. Accessed March 07, 2021. https://pub.epsilon.slu.se/14737/.

MLA Handbook (7th Edition):

Guedes, Benard. “Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique.” 2017. Web. 07 Mar 2021.

Vancouver:

Guedes B. Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique. [Internet] [Doctoral dissertation]. Swedish University of Agricultural Sciences; 2017. [cited 2021 Mar 07]. Available from: https://pub.epsilon.slu.se/14737/.

Council of Science Editors:

Guedes B. Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique. [Doctoral Dissertation]. Swedish University of Agricultural Sciences; 2017. Available from: https://pub.epsilon.slu.se/14737/


Swedish University of Agricultural Sciences

3. Guedes, Benard. Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique.

Degree: 2017, Swedish University of Agricultural Sciences

In Mozambique and neighbouring countries, deforestation and degradation of miombo forests are counteracted by new plantations of fast growing species and conservation of natural woodlands, activities supported by the REDD+ mechanism. The aim of this thesis was to examine the impacts of plantations of Pinus and Eucalyptus compared with mountain miombo forest on carbon stocks and dynamics in soil and tree biomass. The thesis also aimed to develop allometric biomass equations for lowland miombo forest to estimate aboveground tree biomass at the landscape scale. The entire study area was located within the Beira development corridor region, central Mozambique. Study plots of mountain miombo and 34-year-old first rotation plantations of Pinus taeda and Eucalyptus grandis were selected on three study sites in the Western highland of the Manica province to investigate total ecosystem carbon and nitrogen stocks in soil, litter and biomass. Tree biomass was estimated using allometric equations found in the literature. Total ecosystem carbon stocks in soils, litter layer and biomass, and net ecosystem production were all significantly higher in P. taeda and E. grandis plantations than in adjacent mountain miombo forest. Net primary production were higher in P. taeda and E. cloeziana plantations than in adjacent mountain miombo forest. Total soil nitrogen stocks in the topsoil layers were also significantly higher in plantation stands. The higher soil stocks of carbon and nitrogen could be explained to some extent with higher leaf litterfall, from Q-model predictions. However, higher root litter production in plantation stands was probably an additional important contribution to the measured higher soil organic carbon stocks. Two biomass functions were developed for estimating aboveground tree biomass of mixed-species lowland miombo forest. One equation was developed for estimating biomass based on stem diameter at breast height (1.3 m). The other equation was developed for estimating biomass based on stem diameter at stump height, to make it possible to also estimate losses of biomass in high exploitation areas of miombo woodlands.

Subjects/Keywords: biomass; Brachystegia; Eucalyptus; Pinus taeda; forest litter; forest soils; carbon stock assessment; environmental impact assessment; survey methods; Mozambique; Biomass equation; Brachystegia spiciformis; Eucalyptus grandis; Eucalyptus cloeziana; Pinus taeda; Fine root production; Litterfall; Net primary production; Soil carbon

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Guedes, B. (2017). Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique. (Doctoral Dissertation). Swedish University of Agricultural Sciences. Retrieved from https://pub.epsilon.slu.se/14737/

Chicago Manual of Style (16th Edition):

Guedes, Benard. “Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique.” 2017. Doctoral Dissertation, Swedish University of Agricultural Sciences. Accessed March 07, 2021. https://pub.epsilon.slu.se/14737/.

MLA Handbook (7th Edition):

Guedes, Benard. “Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique.” 2017. Web. 07 Mar 2021.

Vancouver:

Guedes B. Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique. [Internet] [Doctoral dissertation]. Swedish University of Agricultural Sciences; 2017. [cited 2021 Mar 07]. Available from: https://pub.epsilon.slu.se/14737/.

Council of Science Editors:

Guedes B. Carbon stocks and dynamics in miombo, pinus and eucalyptus forests in Mozambique. [Doctoral Dissertation]. Swedish University of Agricultural Sciences; 2017. Available from: https://pub.epsilon.slu.se/14737/

.