subject:(forest litter)

Oregon State University

1. Warner, Susan Ann. Cation exchange properties of forest litter as influenced by vegetation type and decomposition.

Degree: MS, Soil Science, 1976, Oregon State University

URL: http://hdl.handle.net/1957/43660

► Decomposition of forest litter is a complex process involving interactions between physical, chemical and biological factors. As litter decomposes it is chemically altered. Cation exchange… (more)

▼ Decomposition of forest litter is a complex process involving interactions between physical, chemical and biological factors. As litter decomposes it is chemically altered. Cation exchange capacities of litter represent a means of characterizing the number of hydrophilic acid groups. Some kind of soil-root ion exchange mechanisms are utilized by the plant for uptake of most nutrients. Cation exchange capacities were determined by ammonium saturation and subsequent Kjeldahl distillation. Solvent extractions of some litters were made with water at three different temperatures, and with isopropanol, ethanol, acetone, water, NaOH, and HCl. The extracted litter was used for CEC determinations. A variety of forest floor materials from different forest types in Eastern North America and Oregon were used in this study. L, P, and H layers were used to determine the effect of decomposition on CEC. Significantly increased CEC magnitudes with increased decomposition was shown for the Oregon samples. Eastern forests also showed increased CEC's with increased decomposition except where high ash contents of an H layer resulted in lower CEC values. Litter samples from the various Oregon forest types showed significant differences in CEC's between vegetation types. Litters from more productive timber sites had greater CEC values for L and F layers than litter from less productive sites. Organic solvents extracted significantly less material from litter than inorganic solvents. Hot water extracted more material from litter than cooler temperature water. CEC's of litter extracted with organic solvents were lower than CEC's of litter extracted with inorganic solvents. Litter collected from streams showed CEC values for bark to be highest and twigs to be lowest. Litter that was more highly decomposed by stream activity had higher CEC's than less decomposed samples. Pre- and post-logging samples that represented combined L + F + H layers did not show significant differences in CEC values between vegetation types. Advisors/Committee Members: Youngberg, Chester T. (advisor).

Subjects/Keywords: Forest litter

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APA (6^th Edition):

Warner, S. A. (1976). Cation exchange properties of forest litter as influenced by vegetation type and decomposition. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/43660

Chicago Manual of Style (16^th Edition):

Warner, Susan Ann. “Cation exchange properties of forest litter as influenced by vegetation type and decomposition.” 1976. Masters Thesis, Oregon State University. Accessed December 10, 2019. http://hdl.handle.net/1957/43660.

MLA Handbook (7^th Edition):

Warner, Susan Ann. “Cation exchange properties of forest litter as influenced by vegetation type and decomposition.” 1976. Web. 10 Dec 2019.

Vancouver:

Warner SA. Cation exchange properties of forest litter as influenced by vegetation type and decomposition. [Internet] [Masters thesis]. Oregon State University; 1976. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/1957/43660.

Council of Science Editors:

Warner SA. Cation exchange properties of forest litter as influenced by vegetation type and decomposition. [Masters Thesis]. Oregon State University; 1976. Available from: http://hdl.handle.net/1957/43660

Oregon State University

2. Tarnócai, Charles. Amount and chemical composition of understory vegetation in Alsea basin forest communities.

Degree: MS, Soils, 1967, Oregon State University

URL: http://hdl.handle.net/1957/46758

► The understory vegetation was sampled in eight plant communities of a Douglas-fir ecosystem to determine the organic matter production and mineral composition. Four sample sites… (more)

▼ The understory vegetation was sampled in eight plant communities of a Douglas-fir ecosystem to determine the organic matter production and mineral composition. Four sample sites were selected in each plant community and the understory vegetation sampled using the method of quadrats of successively increasing size. All herbaceous plants were separated by species while shrubs were first separated by species and then, for each species, by leaves or needles and woody parts. The samples were immediately weighed to obtain the green weight and then were taken to the laboratory, dried, and re-weighed to obtain the dry weight of organic matter produced. After suitable preparation the samples were analyzed chemically to determine their nitrogen, phosphorus, potassium, calcium, magnesium, and manganese concentrations. Using the amount of dry organic matter produced (in kg. /ha.) and the mineral concentrations (in %), the percentage concentrations of these nutrients were converted to the kilogram per hectare basis. It appeared that the organic matter production and mineral content of understory vegetation varied significantly between plant communities. In other words, organic matter production and mineral content tended to be characteristic of each plant community. It was found, however, that unstable, immature communities showed a greater variation in total organic matter production than did climax communities. It was further found that, considering a limited area, the organic matter production of different sample sites within a community was similar. One of the limiting factors for organic matter production, as well as for total mineral content, of understory vegetation was light intensity at ground level as indicated by the percentage crown cover. The mineral concentration of the shrub layer was found to be lower than that of the herb layer with the exception of manganese, for which the shrubs had a higher concentration than did the herbs. It was also noted that certain plant species appeared to be selective for certain minerals. The results of this investigation seem to indicate that the understory plays a very important role in the nutrient cycle. Although it contributes a smaller amount of organic matter than does the overstory, the under story has a much higher mineral concentration and its annual turnover appears to be a very important factor in determining the fertility level of the forest floor. Advisors/Committee Members: Youngberg, C. T. (advisor).

Subjects/Keywords: Forest litter

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APA (6^th Edition):

Tarnócai, C. (1967). Amount and chemical composition of understory vegetation in Alsea basin forest communities. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/46758

Chicago Manual of Style (16^th Edition):

Tarnócai, Charles. “Amount and chemical composition of understory vegetation in Alsea basin forest communities.” 1967. Masters Thesis, Oregon State University. Accessed December 10, 2019. http://hdl.handle.net/1957/46758.

MLA Handbook (7^th Edition):

Tarnócai, Charles. “Amount and chemical composition of understory vegetation in Alsea basin forest communities.” 1967. Web. 10 Dec 2019.

Vancouver:

Tarnócai C. Amount and chemical composition of understory vegetation in Alsea basin forest communities. [Internet] [Masters thesis]. Oregon State University; 1967. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/1957/46758.

Council of Science Editors:

Tarnócai C. Amount and chemical composition of understory vegetation in Alsea basin forest communities. [Masters Thesis]. Oregon State University; 1967. Available from: http://hdl.handle.net/1957/46758

University of Tasmania

3. Turnbull, CRA. Litter studies in the southern forests of Tasmania.

Degree: 1983, University of Tasmania

URL: https://eprints.utas.edu.au/21780/1/whole_TurnbullCharlesRobertAllison1983_thesis.pdf

► Process oriented investigations of litter were made at Hastings, Southern Tasmania, of a range of forests characteristic of the region. ({Accession.}) There was a marked… (more)

▼ Process oriented investigations of litter were made at Hastings, Southern Tasmania, of a range of forests characteristic of the region. ({Accession.}) There was a marked seasonal pattern and correspondence of litterfall between sites over three annual cycles. Bimodality of litterfall was attributable to a peak period of leaf fall and a period of bark and twig fall. Leaf litterfall was significantly correlated with mean maximum temperature, and the secondary peak of bark and twig fall to periods of high wind and heavy rain. A relationship was found between the basal area of individual species and their annual rate of leaf accession. There was no significant difference in slope or intercept of regressions for individual sites, and the relationship existed for all species regardless of their taxonomic group, canopy exposure, or leaf structure and size classification. Annual accession rates were similar to forests of the world of corresponding latitude (ca. 5 t.ha.(^-1)). ({Accumulation.}) Detailed descriptions were made of the litterbed characteristics of individual study sites, and techniques for improving determination of standing-crop values devised. Steady-state decay constants were derived, and a climatic index utilised to compare results of Australian litter studies. ({Decomposition.}) The rates of decomposition of leaves of two eucalypt overstorey species, eight understorey species, and of two overstorey-understorey species mixtures were measured by litter bag techniques. Percentage loss of initial dry weight of leaves varied per species from 12.5 to 58.0 over the initial twelve months of field exposure. Species of higher leaf accession rate generally exhibited a faster rate of decomposition. There were no significant between species interactions monitored in leaf mixtures. Litterbed microflora were demonstrated to be the primary decomposer agencies, with bacteria of initial importance to some species. Macroarthropods and invertebrates demonstrated no significant effects upon the decomposition rates of leaf species other than the eucalypts within the time sequence of the litter bag studies. The role of litter fauna is considered secondary to, and dependent upon, decomposition by other agencies. A method of measuring the decomposition of naturally accumulating litter in the field was devised. Temperature and moisture, as represented by a defined annual climatic index, 'I', were significantly related to annual litter accession and calculated annual decay constants, 'k', for a range of Australian litter studies. Litter macroclimate was thus the most important influence upon litter accumulation.

Subjects/Keywords: Forest litter

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APA (6^th Edition):

Turnbull, C. (1983). Litter studies in the southern forests of Tasmania. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/21780/1/whole_TurnbullCharlesRobertAllison1983_thesis.pdf

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

Chicago Manual of Style (16^th Edition):

Turnbull, CRA. “Litter studies in the southern forests of Tasmania.” 1983. Thesis, University of Tasmania. Accessed December 10, 2019. https://eprints.utas.edu.au/21780/1/whole_TurnbullCharlesRobertAllison1983_thesis.pdf.

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

MLA Handbook (7^th Edition):

Turnbull, CRA. “Litter studies in the southern forests of Tasmania.” 1983. Web. 10 Dec 2019.

Vancouver:

Turnbull C. Litter studies in the southern forests of Tasmania. [Internet] [Thesis]. University of Tasmania; 1983. [cited 2019 Dec 10]. Available from: https://eprints.utas.edu.au/21780/1/whole_TurnbullCharlesRobertAllison1983_thesis.pdf.

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

Council of Science Editors:

Turnbull C. Litter studies in the southern forests of Tasmania. [Thesis]. University of Tasmania; 1983. Available from: https://eprints.utas.edu.au/21780/1/whole_TurnbullCharlesRobertAllison1983_thesis.pdf

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

Central Connecticut State University

4. Sarkar, Babul Kanti, 1971-. Leaf litter processing by stream macroinvertebrates.

Degree: Department of Biology, 2011, Central Connecticut State University

URL: http://content.library.ccsu.edu/u?/ccsutheses,1663

► To investigate leaf litter processing in local streams, a study was conducted during the fall of 2009 with two native tree species, northern red oak… (more)

▼ To investigate leaf litter processing in local streams, a study was conducted during the fall of 2009 with two native tree species, northern red oak (Quercus rubra) and red maple (Acer rubrum) and an invasive species, Japanese knotweed (Fallopia japonica). Multiple leaf packs of 5 g of each leaf type were submerged into three streams (Sandy Brook, Bass Brook and the Eightmile River). Leaf packs of all three species were placed at the Sandy and Bass Brook sites. But leaf packs of only native species were placed at the Eightmile River site. Replicate leaf packs were removed from the streams after 7, 15 and 45 days. Macroinvertebrates were separated from the leaves and identified to family. Leaf processing coefficients were calculated using the percent leaves remaining over time. Among the three species, red maple decomposed faster than either northern red oak or Japanese knotweed likely because it contains less decay-resistant compounds (lignins, tannins) and has a smoother leaf surface, which is favorable for macroinvertebrates. Leaf processing coefficients were also higher in red maple due to its faster decomposition rates. The invasive species, Japanese knotweed, was colonized with the maximum number of macroinvertebrates at the Sandy Brook site. However, the number of macroinvertebrates was higher on northern red oak at the Bass Brook and Eightmile River sites. The majority of macroinvertebrates at the Sandy and Bass Brook sites were from the Orders Trichoptera and Diptera whereas more diverse colonization by macroinvertebrates was found at the Eightmile River site which included the Orders Trichoptera, Plecoptera, Coleoptera and Hymenoptera. This difference in macroinvertebrate colonization may be due to stream characteristics as well as the degree of human disturbance. Among the different functional groups of macroinvertebrates, collectors were dominant at all the three sites which indicates that macroinvertebrates used the leaf packs primarily as shelter. Advisors/Committee Members: ;, Penniman, Clayton A.;.

Subjects/Keywords: Forest litter – Biodegradation – Connecticut; Plant litter – Biodegradation – Connecticut

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APA (6^th Edition):

Sarkar, Babul Kanti, 1. (2011). Leaf litter processing by stream macroinvertebrates. (Thesis). Central Connecticut State University. Retrieved from http://content.library.ccsu.edu/u?/ccsutheses,1663

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

Chicago Manual of Style (16^th Edition):

Sarkar, Babul Kanti, 1971-. “Leaf litter processing by stream macroinvertebrates.” 2011. Thesis, Central Connecticut State University. Accessed December 10, 2019. http://content.library.ccsu.edu/u?/ccsutheses,1663.

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

MLA Handbook (7^th Edition):

Sarkar, Babul Kanti, 1971-. “Leaf litter processing by stream macroinvertebrates.” 2011. Web. 10 Dec 2019.

Vancouver:

Sarkar, Babul Kanti 1. Leaf litter processing by stream macroinvertebrates. [Internet] [Thesis]. Central Connecticut State University; 2011. [cited 2019 Dec 10]. Available from: http://content.library.ccsu.edu/u?/ccsutheses,1663.

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

Council of Science Editors:

Sarkar, Babul Kanti 1. Leaf litter processing by stream macroinvertebrates. [Thesis]. Central Connecticut State University; 2011. Available from: http://content.library.ccsu.edu/u?/ccsutheses,1663

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

University of British Columbia

5. De Catanzaro, Jennifer Barbara. Litter decomposition and nutrient turnover in three ecosystem types of the coastal western hemlock biogeoclimatic zone .

Degree: 1979, University of British Columbia

URL: http://hdl.handle.net/2429/21728

► Rates of litter decomposition, nutrient release, and total forest floor turnover were measured on two replicates of three ecosystem types in the Coastal Western Hemlock… (more)

▼ Rates of litter decomposition, nutrient release, and total forest floor turnover were measured on two replicates of three ecosystem types in the Coastal Western Hemlock Zone of British Columbia, in an attempt to establish whether or not ecosystem types could be differentiated on the basis of functional parameters. Litter bags of two mesh sizes and leaf tethering were used to compare weight losses and nutrient dynamics of specific litter components. The dry weight losses of conifer needles confined in 1 mm mesh bags ranged from 30 to 40 % after one year. There was no significant difference between sites, Weight loss of salal leaves on xeric sites ranged from 20 % after one year for samples confined in 1 mm mesh bags to 45 % for tethered leaf samples. Big-leaf maple weight loss ranged from 15% for samples confined in 1 mm mesh bags to 60 % for tethered samples. Twig samples lost 7 to 21 % of their weight on all sites after six months, with slightly higher values occurring on the hygric sites, Cellulose strips in 4 mm mesh bags lost an average of 23 % of their weight on the-xeric, 21 % on the mesic, and 40 % on the hygric sites. Nutrient mass and concentration changes over one year varied somewhat between different types of foliage litter. The total mass of K, Mg, and Ca decreased in all litter types on all sites, N and P mass changes were more variable, The relative mobility of nutrients released from decomposing conifer litter was Ca> Mg?P>K>N, and from broad-leaf litter was Ca>Mg>K>P>N. The low mobility of K was concluded to be due to leaching of this element from the litter prior to its collection for the study. Numbers of fauna in the forest floor were compared on one replicate of each of the ecosystem types at six week intervals throughout the year. Micro-fauna were more abundant on the xeric and mesic sites, while macro- and meso-fauna were more numerous on the hygric sites. Numbers were lowest on all sites when forest floor moisture was lowest in August. At other times of the year population fluctuations were different for different fauna groups. Forest floor biomass was also measured on one replicate of each ecosystem type. It averaged 45,05 tonnes • ha⁻¹ on the xeric sites, 45.68 tonnes • ha⁻¹ on the mesic sites, and 25,20 tonnes • ha⁻¹ on the hygric site. Annual forest floor turnover rates were calculated to be .015 for the xeric, ,017 for the-mesic, and ,040 for the hygric sates, Differences in turnover rates between sites were attributed more to differences in the quantities- of wood and herbaceous foliage on the three sites than to differences in the decomposition rates of individual substrates.

Subjects/Keywords: Forest litter – Biodegradation

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APA (6^th Edition):

De Catanzaro, J. B. (1979). Litter decomposition and nutrient turnover in three ecosystem types of the coastal western hemlock biogeoclimatic zone . (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/21728

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

Chicago Manual of Style (16^th Edition):

De Catanzaro, Jennifer Barbara. “Litter decomposition and nutrient turnover in three ecosystem types of the coastal western hemlock biogeoclimatic zone .” 1979. Thesis, University of British Columbia. Accessed December 10, 2019. http://hdl.handle.net/2429/21728.

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

MLA Handbook (7^th Edition):

De Catanzaro, Jennifer Barbara. “Litter decomposition and nutrient turnover in three ecosystem types of the coastal western hemlock biogeoclimatic zone .” 1979. Web. 10 Dec 2019.

Vancouver:

De Catanzaro JB. Litter decomposition and nutrient turnover in three ecosystem types of the coastal western hemlock biogeoclimatic zone . [Internet] [Thesis]. University of British Columbia; 1979. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/2429/21728.

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

Council of Science Editors:

De Catanzaro JB. Litter decomposition and nutrient turnover in three ecosystem types of the coastal western hemlock biogeoclimatic zone . [Thesis]. University of British Columbia; 1979. Available from: http://hdl.handle.net/2429/21728

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

University of Florida

6. Schreeg,Laura A. Leaf litter leaching and nutrient cycling in lowland tropical forests.

Degree: PhD, Interdisciplinary Ecology, 2011, University of Florida

URL: http://ufdc.ufl.edu/UFE0043171

► Nutrient availability to plants and microbes exerts key controls on the terrestrial carbon cycle. In many systems, nutrients recycled from leaf litter, through decomposition, are… (more)

Subjects/Keywords: Carbon; Forest litter; Nutrients; Phosphates; Phosphorus; Plant litter; Soils; Solubility; Sorption; Water tables; decomposition – ecosystem – forest – litter – nutrient – phosphorus – tropics

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APA (6^th Edition):

A, S. (2011). Leaf litter leaching and nutrient cycling in lowland tropical forests. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0043171

Chicago Manual of Style (16^th Edition):

A, Schreeg,Laura. “Leaf litter leaching and nutrient cycling in lowland tropical forests.” 2011. Doctoral Dissertation, University of Florida. Accessed December 10, 2019. http://ufdc.ufl.edu/UFE0043171.

MLA Handbook (7^th Edition):

A, Schreeg,Laura. “Leaf litter leaching and nutrient cycling in lowland tropical forests.” 2011. Web. 10 Dec 2019.

Vancouver:

A S. Leaf litter leaching and nutrient cycling in lowland tropical forests. [Internet] [Doctoral dissertation]. University of Florida; 2011. [cited 2019 Dec 10]. Available from: http://ufdc.ufl.edu/UFE0043171.

Council of Science Editors:

A S. Leaf litter leaching and nutrient cycling in lowland tropical forests. [Doctoral Dissertation]. University of Florida; 2011. Available from: http://ufdc.ufl.edu/UFE0043171

Massey University

7. Costall, Jessica Anne. The effects of restoration on the structure and function of litter invertebrate communities in New Zealand native forest remnants.

Degree: PhD, Ecology, 2012, Massey University

URL: http://hdl.handle.net/10179/4875

► Much of New Zealand‘s remaining lowland forest exists as small, often degraded and heavily disturbed remnants on private farmland. Disturbances, such as livestock grazing and… (more)

▼ Much of New Zealand‘s remaining lowland forest exists as small, often degraded and heavily disturbed remnants on private farmland. Disturbances, such as livestock grazing and browsing by mammalian pests, are known to have a detrimental effect on native vegetation of these remnants. However, it is unclear what impact these disturbances have on the structure and function of forest floor invertebrate communities. Existing studies of forest fragmentation have predominantly focused on the effects of remnant area and shape, rather than remnant condition. This study examines how litter invertebrate habitat, community structure, and leaf litter decomposition, vary between grazed and ungrazed (fenced) remnants of differing size, and nearby forest reserves. Secondly, I examine how invertebrate community structure and function recover with time since livestock exclusion, with and without additional mammalian pest control. I found that grazed remnants provide dramatically altered habitat for litter invertebrates, compared to fenced remnants and large forest reserves. Grazed remnants are typified by having higher soil compaction, minimal understorey vegetation, and reduced litter cover. Consequently, grazed remnants have depauperate, yet highly variable invertebrate communities, compared to fenced remnants and forest reserves. Even very small forest remnants can support litter invertebrate communities very similar to that of larger forest reserves, provided they are protected from livestock grazing. Furthermore, invertebrate communities show strong recovery over time since livestock exclusion, particularly when livestock exclusion is combined with mammalian pest control measures. I found that litter decomposition rates did not differ between management treatments in my first observational study. However, in the second observational study, leaf decomposition rates at the edge of remnants increased with time since livestock exclusion, suggesting that restoration actions can lead to changes in ecological functioning. Small native forest remnants have high ecological value and substantial restoration gains can be made through the relatively simple action of fencing to exclude livestock.

Subjects/Keywords: Forest remnants; Forest ecology; Livestock grazing; Environmental effects of grazing; Invertebrates; Invertebrate communities; Litter invertebrates; Forest restoration; Forest litter ecology

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APA (6^th Edition):

Costall, J. A. (2012). The effects of restoration on the structure and function of litter invertebrate communities in New Zealand native forest remnants. (Doctoral Dissertation). Massey University. Retrieved from http://hdl.handle.net/10179/4875

Chicago Manual of Style (16^th Edition):

Costall, Jessica Anne. “The effects of restoration on the structure and function of litter invertebrate communities in New Zealand native forest remnants.” 2012. Doctoral Dissertation, Massey University. Accessed December 10, 2019. http://hdl.handle.net/10179/4875.

MLA Handbook (7^th Edition):

Costall, Jessica Anne. “The effects of restoration on the structure and function of litter invertebrate communities in New Zealand native forest remnants.” 2012. Web. 10 Dec 2019.

Vancouver:

Costall JA. The effects of restoration on the structure and function of litter invertebrate communities in New Zealand native forest remnants. [Internet] [Doctoral dissertation]. Massey University; 2012. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/10179/4875.

Council of Science Editors:

Costall JA. The effects of restoration on the structure and function of litter invertebrate communities in New Zealand native forest remnants. [Doctoral Dissertation]. Massey University; 2012. Available from: http://hdl.handle.net/10179/4875

Oregon State University

8. van Huysen, Tiffany L. Nitrogen and phosphorus dynamics during decomposition of multiple litter types in temperate coniferous forests.

Degree: PhD, Forest Science, 2009, Oregon State University

URL: http://hdl.handle.net/1957/11279

► Litter nutrient dynamics contribute significantly to biogeochemical cycling in forest ecosystems. These dynamics may be influenced by site attributes, litter nutrient concentrations, and soil nutrient… (more)

▼ Litter nutrient dynamics contribute significantly to biogeochemical cycling in forest ecosystems. These dynamics may be influenced by site attributes, litter nutrient concentrations, and soil nutrient availability either independently or synergistically. Litter nutrient dynamics were examined in two decomposition studies in temperate coniferous forests of Oregon. I used ¹⁵N-labelled litter of three species in a comparative study of how site environment and initial substrate quality influence decomposition and nitrogen (N) dynamics of fresh foliage, fine roots, and twigs at Cascade Head Experimental Forest and H. J. Andrews Experimental Forest. There were no site differences with respect to N dynamics, and N mineralization patterns were species-specific. Although N immobilization did occur early in the decomposition process, the general trend for all litter was net N mineralization throughout the study without a net N immobilization phase. For several litter x species combinations the difference between gross N mineralization and net N mineralization was significant, with gross N mineralization ~7 to 20% greater than net mineralization. These results suggest that initial litter chemistry is a more important driver than site environmental differences of the N dynamics associated with decomposition. I also assessed whether litter phosphorus (P) concentrations and soil P availability influenced decomposition rates and litter nutrient dynamics in N-rich Douglas-fir forests in the Oregon Coast Range using a factorial P fertilization experiment. Over the course of 2 years, fresh foliage, fine root, and twig litter from Douglas-fir seedlings were decomposed at three sites. Litter mineralized P at a rapid rate early in the decomposition process compared to N, which was mineralized more slowly or immobilized. Decomposition rates and mineralization of N and P were strongly correlated with initial litter chemistry. Initial litter element ratios between control and P-fertilized litter differed, but over the 2 years element ratios (C:N, C:P, N:P) converged to similar values across treatments. These studies confirm that net mineralization of N and P may occur early in the decomposition process and that litter may decompose without exhibiting a net N immobilization phase. Further, initial litter nutrient concentrations and element ratios may be important predictors of nutrient transformations during decomposition. Advisors/Committee Members: Harmon, Mark E. (advisor), Bond, Barbara J. (committee member).

Subjects/Keywords: nitrogen; Forest litter – Biodegradation – Oregon – H.J. Andrews Experimental Forest

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APA (6^th Edition):

van Huysen, T. L. (2009). Nitrogen and phosphorus dynamics during decomposition of multiple litter types in temperate coniferous forests. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/11279

Chicago Manual of Style (16^th Edition):

van Huysen, Tiffany L. “Nitrogen and phosphorus dynamics during decomposition of multiple litter types in temperate coniferous forests.” 2009. Doctoral Dissertation, Oregon State University. Accessed December 10, 2019. http://hdl.handle.net/1957/11279.

MLA Handbook (7^th Edition):

van Huysen, Tiffany L. “Nitrogen and phosphorus dynamics during decomposition of multiple litter types in temperate coniferous forests.” 2009. Web. 10 Dec 2019.

Vancouver:

van Huysen TL. Nitrogen and phosphorus dynamics during decomposition of multiple litter types in temperate coniferous forests. [Internet] [Doctoral dissertation]. Oregon State University; 2009. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/1957/11279.

Council of Science Editors:

van Huysen TL. Nitrogen and phosphorus dynamics during decomposition of multiple litter types in temperate coniferous forests. [Doctoral Dissertation]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/11279

Montana Tech

9. Lutes, Duncan Campbell. Comparison of methods for the quantification of coarse woody debris and identification of its spatial scale| A study from the Tenderfoot Creek Experimental Forest, Montana.

Degree: MS, 1999, Montana Tech

URL: https://scholarworks.umt.edu/etd/1866

Subjects/Keywords: Forest litter; Forest management Montana

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APA (6^th Edition):

Lutes, D. C. (1999). Comparison of methods for the quantification of coarse woody debris and identification of its spatial scale| A study from the Tenderfoot Creek Experimental Forest, Montana. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/1866

Chicago Manual of Style (16^th Edition):

Lutes, Duncan Campbell. “Comparison of methods for the quantification of coarse woody debris and identification of its spatial scale| A study from the Tenderfoot Creek Experimental Forest, Montana.” 1999. Masters Thesis, Montana Tech. Accessed December 10, 2019. https://scholarworks.umt.edu/etd/1866.

MLA Handbook (7^th Edition):

Lutes, Duncan Campbell. “Comparison of methods for the quantification of coarse woody debris and identification of its spatial scale| A study from the Tenderfoot Creek Experimental Forest, Montana.” 1999. Web. 10 Dec 2019.

Vancouver:

Lutes DC. Comparison of methods for the quantification of coarse woody debris and identification of its spatial scale| A study from the Tenderfoot Creek Experimental Forest, Montana. [Internet] [Masters thesis]. Montana Tech; 1999. [cited 2019 Dec 10]. Available from: https://scholarworks.umt.edu/etd/1866.

Council of Science Editors:

Lutes DC. Comparison of methods for the quantification of coarse woody debris and identification of its spatial scale| A study from the Tenderfoot Creek Experimental Forest, Montana. [Masters Thesis]. Montana Tech; 1999. Available from: https://scholarworks.umt.edu/etd/1866

Montana Tech

10. Snell, J. A. Direct estimation of surface fuel bulk density and loading in western Montana and northern Idaho.

Degree: MS, 1979, Montana Tech

URL: https://scholarworks.umt.edu/etd/2078

Subjects/Keywords: Forest litter; Forest fires Research

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APA (6^th Edition):

Snell, J. A. (1979). Direct estimation of surface fuel bulk density and loading in western Montana and northern Idaho. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/2078

Chicago Manual of Style (16^th Edition):

Snell, J A. “Direct estimation of surface fuel bulk density and loading in western Montana and northern Idaho.” 1979. Masters Thesis, Montana Tech. Accessed December 10, 2019. https://scholarworks.umt.edu/etd/2078.

MLA Handbook (7^th Edition):

Snell, J A. “Direct estimation of surface fuel bulk density and loading in western Montana and northern Idaho.” 1979. Web. 10 Dec 2019.

Vancouver:

Snell JA. Direct estimation of surface fuel bulk density and loading in western Montana and northern Idaho. [Internet] [Masters thesis]. Montana Tech; 1979. [cited 2019 Dec 10]. Available from: https://scholarworks.umt.edu/etd/2078.

Council of Science Editors:

Snell JA. Direct estimation of surface fuel bulk density and loading in western Montana and northern Idaho. [Masters Thesis]. Montana Tech; 1979. Available from: https://scholarworks.umt.edu/etd/2078

Montana Tech

11. Artley, Donald Kenneth. Predicting duff reduction from broadcast burning in western larch – douglas-fir stands.

Degree: MS, 1976, Montana Tech

URL: https://scholarworks.umt.edu/etd/3275

Subjects/Keywords: Forest litter; Forest fires Research

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APA (6^th Edition):

Artley, D. K. (1976). Predicting duff reduction from broadcast burning in western larch – douglas-fir stands. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/3275

Chicago Manual of Style (16^th Edition):

Artley, Donald Kenneth. “Predicting duff reduction from broadcast burning in western larch – douglas-fir stands.” 1976. Masters Thesis, Montana Tech. Accessed December 10, 2019. https://scholarworks.umt.edu/etd/3275.

MLA Handbook (7^th Edition):

Artley, Donald Kenneth. “Predicting duff reduction from broadcast burning in western larch – douglas-fir stands.” 1976. Web. 10 Dec 2019.

Vancouver:

Artley DK. Predicting duff reduction from broadcast burning in western larch – douglas-fir stands. [Internet] [Masters thesis]. Montana Tech; 1976. [cited 2019 Dec 10]. Available from: https://scholarworks.umt.edu/etd/3275.

Council of Science Editors:

Artley DK. Predicting duff reduction from broadcast burning in western larch – douglas-fir stands. [Masters Thesis]. Montana Tech; 1976. Available from: https://scholarworks.umt.edu/etd/3275

Humboldt State University

12. Ewell, Carol Marie. Methods and modeling equations to quantify the litter layer of coniferous forests in California national forests.

Degree: 2006, Humboldt State University

URL: http://hdl.handle.net/2148/140

► Forest litter is a dead fuel layer comprised of recently fallen vegetative particles from trees and other plants such as leaves, needles, cones, and bark… (more)

Subjects/Keywords: Forest litter; Litter loading; Modeling equations; Coniferous forest litter; California national forests; Litter in national forests; Quantify forest litter; Forest floor

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APA (6^th Edition):

Ewell, C. M. (2006). Methods and modeling equations to quantify the litter layer of coniferous forests in California national forests. (Thesis). Humboldt State University. Retrieved from http://hdl.handle.net/2148/140

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

Chicago Manual of Style (16^th Edition):

Ewell, Carol Marie. “Methods and modeling equations to quantify the litter layer of coniferous forests in California national forests.” 2006. Thesis, Humboldt State University. Accessed December 10, 2019. http://hdl.handle.net/2148/140.

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

MLA Handbook (7^th Edition):

Ewell, Carol Marie. “Methods and modeling equations to quantify the litter layer of coniferous forests in California national forests.” 2006. Web. 10 Dec 2019.

Vancouver:

Ewell CM. Methods and modeling equations to quantify the litter layer of coniferous forests in California national forests. [Internet] [Thesis]. Humboldt State University; 2006. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/2148/140.

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

Council of Science Editors:

Ewell CM. Methods and modeling equations to quantify the litter layer of coniferous forests in California national forests. [Thesis]. Humboldt State University; 2006. Available from: http://hdl.handle.net/2148/140

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

13. Patil,Gopal P. Recycling of nutrients through forest litter; -.

Degree: Zoology, 1983, Gujarat University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/30946

none newline

-

Advisors/Committee Members: Vyas,A B.

Subjects/Keywords: forest; litter; nutrients; Recycling; through

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APA (6^th Edition):

P, P. (1983). Recycling of nutrients through forest litter; -. (Thesis). Gujarat University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/30946

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

Chicago Manual of Style (16^th Edition):

P, Patil,Gopal. “Recycling of nutrients through forest litter; -.” 1983. Thesis, Gujarat University. Accessed December 10, 2019. http://shodhganga.inflibnet.ac.in/handle/10603/30946.

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

MLA Handbook (7^th Edition):

P, Patil,Gopal. “Recycling of nutrients through forest litter; -.” 1983. Web. 10 Dec 2019.

Vancouver:

P P. Recycling of nutrients through forest litter; -. [Internet] [Thesis]. Gujarat University; 1983. [cited 2019 Dec 10]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/30946.

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

Council of Science Editors:

P P. Recycling of nutrients through forest litter; -. [Thesis]. Gujarat University; 1983. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/30946

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

Oregon State University

14. Wright, Pamela J. The effect of fire regime on coarse woody debris in the west central Cascades, Oregon.

Degree: MS, Forest Science, 1998, Oregon State University

URL: http://hdl.handle.net/1957/11101

► This study examined the effect of fire regime on coarse woody debris (CWD) mass using a combination of field data and modeling. The objectives were… (more)

▼ This study examined the effect of fire regime on coarse woody debris (CWD) mass using a combination of field data and modeling. The objectives were to use field sampling to determine how CWD differs between two areas that have had different fire regimes, and investigate how fire frequency and severity, stand growth and development, decomposition, and mortality rates affect the amount of CWD for sites experiencing two different fire regimes. One regime had infrequent, high severity fires, with a mean fire return interval over 300 years. The second regime exhibited more frequent (120 years), mixed-severity fires which created a mosaic of patches with multiple disturbance cohorts of shade tolerant tree species within stands. A conceptual model of how CWD might be affected by different fire regimes was developed. Then field data were gathered on CWD mass, tree biomass, and site productivity in Douglas-fir forests within stands that have had two different fire regimes for the past 500 years. Finally, a mass-budget model was developed to compare field data and model results, and was used to better understand the dynamics of CWD with regard to fire regime. While fire frequency and severity established the pattern of CWD succession, it is the interaction of fire regime with the other controlling factors that is responsible for the differences in CWD mass. The study yielded the following findings: 1) Field data indicated that CWD mass was almost twice as high in stands having an infrequent, stand-replacing fire regime (173 Mg/ha) compared with stands having a moderately frequent, mixed-severity fire regime (95 Mg/ha). 2) Factors that appear to have the greatest influence in the study area are decomposition rates, fire severity, fire frequency, and fuel consumption, suggesting that environment and stand structure control CWD mass more than fire regime per Se. 3) Site productivity and mortality rates are similar among sites in the study area, and do not exert a detectable influence for the range of environments examined. 4) CWD distribution was skewed toward the fresher decay classes in the stand-replacing fire regime, but was normally distributed in the mixed-severity regime. 5) CWD levels have greater temporal variability in the infrequent, stand-replacing fire regime than the mixed-severity regime. 6) In the stand-replacing regime, mortality over time contributes to CWD mass since there is a long span of time between events; whereas, in the mixed-severity regime mortality is more associated with events than with stand mortality over time. Advisors/Committee Members: Harmon, Mark E. (advisor), Huff, Mark (committee member).

Subjects/Keywords: Forest litter – Cascade Range

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APA (6^th Edition):

Wright, P. J. (1998). The effect of fire regime on coarse woody debris in the west central Cascades, Oregon. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11101

Chicago Manual of Style (16^th Edition):

Wright, Pamela J. “The effect of fire regime on coarse woody debris in the west central Cascades, Oregon.” 1998. Masters Thesis, Oregon State University. Accessed December 10, 2019. http://hdl.handle.net/1957/11101.

MLA Handbook (7^th Edition):

Wright, Pamela J. “The effect of fire regime on coarse woody debris in the west central Cascades, Oregon.” 1998. Web. 10 Dec 2019.

Vancouver:

Wright PJ. The effect of fire regime on coarse woody debris in the west central Cascades, Oregon. [Internet] [Masters thesis]. Oregon State University; 1998. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/1957/11101.

Council of Science Editors:

Wright PJ. The effect of fire regime on coarse woody debris in the west central Cascades, Oregon. [Masters Thesis]. Oregon State University; 1998. Available from: http://hdl.handle.net/1957/11101

Oregon State University

15. Valachovic, Yana S. Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem.

Degree: MS, Forest Science, 1998, Oregon State University

URL: http://hdl.handle.net/1957/11097

► The effects of initial leaf litter chemistry of 16 common coniferous and deciduous hardwoods and shrubs on their annual decomposition patterns were studied on the… (more)

▼ The effects of initial leaf litter chemistry of 16 common coniferous and deciduous hardwoods and shrubs on their annual decomposition patterns were studied on the H.J. Andrews Experimental Forest (Oregon). Leaf litters were characterized by their chemical qualities, which included measurement of elemental fractions (C, N, P, K, Ca, Mg), proximate fractions (non-polar, polar, acid-soluble extractives, acid-soluble lignin and acid-insoluble "Klason lignin"), and colorimetric characters (total phenolics, reactive polyphenolics, water-soluble carbohydrates, water-soluble condensed tannins, and water and acid-insoluble condensed tannins). These analytical methods improve upon traditional proximate analysis (Ryan et al. 1990) used to characterize leaf litters, through measurement of reactive and residual phenolic fractions and acid-soluble lignin. This paper discusses the procedures that are involved in improving proximate analysis and the link between leaf chemistry and one year decomposition rates. Significant differences were found in leaf litter qualities and in decomposition rates (expressed as decay) among species. The annual decay (k) for the leaf litter ranged from 0.27 to 1.02. The decay values for all species combined had highly significant (p [less than or equal to] 0.0001) correlations with 29 out of the 36 initial chemistry variables tested. The three highest correlations were with acid-insoluble condensed tannins (r= 0.83 p [less than or equal to] 0.0001 n=339), the lignocellulose index (r= -0.81 p[less than or equal to] 0.0001, n=339) and acid-insoluble residue or 'Klason lignin" (r= -0.80 p [less than or equal to] 0.0001, n=339). A multiple regression model with all 16 species suggested that annual decomposition was best related to acid-insoluble condensed tannins, Klason lignin, water-insoluble condensed tannins, Ca and total phenolic:N ( R²=0.84, p [less than or equal] 0.0001, n= 339). Correlation and multiple linear regression models with each species' decay rate revealed that no one single initial chemical predictor could best explain the decomposition rates for each of the 16 species and that there were a wide range of chemical predictors related to the patterns of decomposition for each species. Advisors/Committee Members: Cromack, Kermit Jr. (advisor).

Subjects/Keywords: Forest litter – Biodegradation – Northwest; Pacific

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APA (6^th Edition):

Valachovic, Y. S. (1998). Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11097

Chicago Manual of Style (16^th Edition):

Valachovic, Yana S. “Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem.” 1998. Masters Thesis, Oregon State University. Accessed December 10, 2019. http://hdl.handle.net/1957/11097.

MLA Handbook (7^th Edition):

Valachovic, Yana S. “Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem.” 1998. Web. 10 Dec 2019.

Vancouver:

Valachovic YS. Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem. [Internet] [Masters thesis]. Oregon State University; 1998. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/1957/11097.

Council of Science Editors:

Valachovic YS. Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem. [Masters Thesis]. Oregon State University; 1998. Available from: http://hdl.handle.net/1957/11097

Oregon State University

16. Yatskov, Mikhail A. A chronosequence of wood decomposition in the boreal forests of Russia.

Degree: MS, Forest Science, 2000, Oregon State University

URL: http://hdl.handle.net/1957/11095

► Coarse woody debris (CWD) decomposition in the Russian boreal forests of the southern taiga zone was studied at four sites located near St. Petersburg in… (more)

▼ Coarse woody debris (CWD) decomposition in the Russian boreal forests of the southern taiga zone was studied at four sites located near St. Petersburg in Northwestern Russia, Krasnoyarsk in Eastern Siberia, lrkutsk in the Baikal region, and Khabarovsk in the Russian Far East. This study was part of a broader research project assessing processes associated with accumulation, storage, and release of carbon by woody detritus in the forests of Russia. A five-class system based on CWD visual characteristics was used to separate logs and snags into decay classes and to estimate their wood density. The largest effect on density was associated with decay classes and species. Region and position had minor effects on density. Decay-class specific density showed a gradual decrease from decay class one (least decayed) to decay class five (most decayed) regardless of species and region. Coniferous snags showed no decrease in density at least for the first two decay classes; for birch this decrease was gradual for both logs and snags. Species became more similar in density from decay class one to decay class five. The chronosequence approach was used to study CWD decomposition by determining change in CWD mass over time. Larch (Larix spp.) and white pine (Pinus siberica/koraiensis) logs had lower decomposition rate-constants than other studied species among the regions fluctuating between 0.015 and 0.031 year [superscript] -1 for larch and 0.015 and 0.019 year[superscript]-1 for white pine. Birch (Betula pendula) had the highest decomposition rate-constants among all species and regions ranging between 0.042 and 0.078 year-1. No effect of temperature or precipitation on decomposition rates was observed among the studied regions, although globally there is a significant effect of temperature at least for species with non-decay resistant heartwood. The management implications of the project results for increasing carbon storage potential of Russian forests through CWD management were examined. The current carbon store of CWD including all forest covered land and disturbed forestland was estimated to be 4.31 Pg C. Depending on species composition, this store can be either decreased to 1.56 Pg C with all tree species being replaced by birch, the fastest decomposing species, or increased to 8.11 Pg C with all species being replaced by Korean pine, the slowest decomposing species. The magnitude of these changes is substantial when compared to the potential increases in carbon sequestration of 2.02 Pg C associated with other management steps such as establishing plantations on forest and agricultural lands, reducing stand replacement fires, reducing harvest rates and increasing rotation age, increasing stand productivity via silvicultural treatments, and establishing plantations on sands, drained peat bogs, and mine tailings. Advisors/Committee Members: Harmon, Mark E. (advisor).

Subjects/Keywords: Forest litter – Biodegradation – Russia

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APA (6^th Edition):

Yatskov, M. A. (2000). A chronosequence of wood decomposition in the boreal forests of Russia. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11095

Chicago Manual of Style (16^th Edition):

Yatskov, Mikhail A. “A chronosequence of wood decomposition in the boreal forests of Russia.” 2000. Masters Thesis, Oregon State University. Accessed December 10, 2019. http://hdl.handle.net/1957/11095.

MLA Handbook (7^th Edition):

Yatskov, Mikhail A. “A chronosequence of wood decomposition in the boreal forests of Russia.” 2000. Web. 10 Dec 2019.

Vancouver:

Yatskov MA. A chronosequence of wood decomposition in the boreal forests of Russia. [Internet] [Masters thesis]. Oregon State University; 2000. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/1957/11095.

Council of Science Editors:

Yatskov MA. A chronosequence of wood decomposition in the boreal forests of Russia. [Masters Thesis]. Oregon State University; 2000. Available from: http://hdl.handle.net/1957/11095

Montana Tech

17. Hillhouse, Margaret I. Strategy for improving the efficiency of duff moisture content and duff structure estimates.

Degree: MS, 1983, Montana Tech

URL: https://scholarworks.umt.edu/etd/3682

Subjects/Keywords: Forest litter; Sampling (Statistics)

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APA (6^th Edition):

Hillhouse, M. I. (1983). Strategy for improving the efficiency of duff moisture content and duff structure estimates. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/3682

Chicago Manual of Style (16^th Edition):

Hillhouse, Margaret I. “Strategy for improving the efficiency of duff moisture content and duff structure estimates.” 1983. Masters Thesis, Montana Tech. Accessed December 10, 2019. https://scholarworks.umt.edu/etd/3682.

MLA Handbook (7^th Edition):

Hillhouse, Margaret I. “Strategy for improving the efficiency of duff moisture content and duff structure estimates.” 1983. Web. 10 Dec 2019.

Vancouver:

Hillhouse MI. Strategy for improving the efficiency of duff moisture content and duff structure estimates. [Internet] [Masters thesis]. Montana Tech; 1983. [cited 2019 Dec 10]. Available from: https://scholarworks.umt.edu/etd/3682.

Council of Science Editors:

Hillhouse MI. Strategy for improving the efficiency of duff moisture content and duff structure estimates. [Masters Thesis]. Montana Tech; 1983. Available from: https://scholarworks.umt.edu/etd/3682

Virginia Tech

18. Neal, Andrew Wilson. Soil Carbon and Nitrogen Dynamics Across the Hillslope-Riparian Interface in Adjacent Watersheds with Contrasting Cellulosic Biofuel Systems.

Degree: MS, Forest Resources and Environmental Conservation, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/48125

► Climate change resulting from emissions of fossil fuel combustion has sparked considerable interest in renewable energy and fuel production research, particularly energy derived from cellulosic… (more)

Subjects/Keywords: switchgrass; forest soils; loblolly pine plantations; litter decomposition; nitrogen mineralization; agroforestry

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APA (6^th Edition):

Neal, A. W. (2014). Soil Carbon and Nitrogen Dynamics Across the Hillslope-Riparian Interface in Adjacent Watersheds with Contrasting Cellulosic Biofuel Systems. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/48125

Chicago Manual of Style (16^th Edition):

Neal, Andrew Wilson. “Soil Carbon and Nitrogen Dynamics Across the Hillslope-Riparian Interface in Adjacent Watersheds with Contrasting Cellulosic Biofuel Systems.” 2014. Masters Thesis, Virginia Tech. Accessed December 10, 2019. http://hdl.handle.net/10919/48125.

MLA Handbook (7^th Edition):

Neal, Andrew Wilson. “Soil Carbon and Nitrogen Dynamics Across the Hillslope-Riparian Interface in Adjacent Watersheds with Contrasting Cellulosic Biofuel Systems.” 2014. Web. 10 Dec 2019.

Vancouver:

Neal AW. Soil Carbon and Nitrogen Dynamics Across the Hillslope-Riparian Interface in Adjacent Watersheds with Contrasting Cellulosic Biofuel Systems. [Internet] [Masters thesis]. Virginia Tech; 2014. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/10919/48125.

Council of Science Editors:

Neal AW. Soil Carbon and Nitrogen Dynamics Across the Hillslope-Riparian Interface in Adjacent Watersheds with Contrasting Cellulosic Biofuel Systems. [Masters Thesis]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/48125

University of British Columbia

19. Woon, Chio-Yio. Study of litterfall and forest floor accumulation in the spacing plantations of Douglas fir at the University of British Columbia Research Forest .

Degree: 1970, University of British Columbia

URL: http://hdl.handle.net/2429/34512

► Litterfall in the UBG Research Forest was collected from traps randomly-placed in each of five half-acre plots of twelve year old Coastal Douglas fir of… (more)

▼ Litterfall in the UBG Research Forest was collected from traps randomly-placed in each of five half-acre plots of twelve year old Coastal Douglas fir of spacings ranging from 3 x 3 to 15 x 15 feet. Collections were also made from a half-acre plot of 3 x 3 feet spaced eleven year old western hemlock, and from an older, thinned natural stand of western red cedar and western hemlock. Forest floor accumulations and soil samples from each plot were also collected and analysed. The amount of litterfall in the Douglas fir spacing plots showed that the denser the stand the greater was the litterfall. The percentage of litter from broadleaved species present was in increasing order from the 3 x 3 to the 15 x 15 feet Douglas fir plots. The amount of litterfall in the Douglas fir was about 3,000 kg/ha more than that in the western hemlock plot of the same spacing. The litterfall in the cedar-hemlock stand showed a large amount of cones and twigs, but was not greater than the litterfall collected from the denser plantations of Douglas fir. It should be noted that the 3x3 and 6x6 feet Douglas fir plots of this study gave a much greater litterfall than the values reported by other authors for this species. However, judging from the literature, comparable data for stands of this age and density are not available. Since the variation of litterfall within a plot was very great, the number of traps needed will have to be increased to attain a precision of ± 10 gm at 5% probability level for an annual collection. The amount of forest floor decreased as spacing widened. It was shown statistically that two groups of plots existed: one with associated vegetation (12 x 12 and 15 x 15 feet) and the other without (3x3 and 6x6 feet plots). The weight of forest floor of western hemlock was less than that of Douglas fir of the same spacing. The weights of forest floor obtained in this study were well below the figures given by other authors in this field. The index of forest floor turnover, calculated from the ratio of litter-fall/forest floor showed that the closer-spaced plantations had a higher ratio than the wider-spaced. This suggests that faster circulation of nutrient elements is going on in the stand with a full canopy than in a more widely spaced stand. The chemical contents of the litterfall and forest floor were determined on composite samples from each plot. Nutrient concentration in litterfall and forest floor did not vary with spacing in the Douglas fir plots. The ground vegetation layer found only under the wider Douglas fir spacings showed greater concentration of phosphorus and potassium than the litter or forest floor of all the spacings. The calcium concentration in the western hemlock and cedar-hemlock plots was higher than that found in the Douglas fir plots, but phosphorus was found to be lower. However, the total amount of nutrients in litterfall and in forest floor under differently spaced Douglas fir plantations followed a distinct pattern: a higher content was present in the denser and lower in the wider plots.…

Subjects/Keywords: Forest litter; Douglas dir; Reforestation

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APA (6^th Edition):

Woon, C. (1970). Study of litterfall and forest floor accumulation in the spacing plantations of Douglas fir at the University of British Columbia Research Forest . (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/34512

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

Chicago Manual of Style (16^th Edition):

Woon, Chio-Yio. “Study of litterfall and forest floor accumulation in the spacing plantations of Douglas fir at the University of British Columbia Research Forest .” 1970. Thesis, University of British Columbia. Accessed December 10, 2019. http://hdl.handle.net/2429/34512.

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

MLA Handbook (7^th Edition):

Woon, Chio-Yio. “Study of litterfall and forest floor accumulation in the spacing plantations of Douglas fir at the University of British Columbia Research Forest .” 1970. Web. 10 Dec 2019.

Vancouver:

Woon C. Study of litterfall and forest floor accumulation in the spacing plantations of Douglas fir at the University of British Columbia Research Forest . [Internet] [Thesis]. University of British Columbia; 1970. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/2429/34512.

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

Council of Science Editors:

Woon C. Study of litterfall and forest floor accumulation in the spacing plantations of Douglas fir at the University of British Columbia Research Forest . [Thesis]. University of British Columbia; 1970. Available from: http://hdl.handle.net/2429/34512

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

University of Arkansas

20. Skvarla, Michael Joseph. Ozark Highland Cunaxidae (Acari: Prostigmata): Descriptions and keys to genera found to occur in the region and a new phylogenetic hypothesis for the family.

Degree: MS, 2011, University of Arkansas

URL: https://scholarworks.uark.edu/etd/120

► Fourteen genera of Cunaxidae (Acari: Prostigmata) are reported from the Ozark Highlands for the first time. Descriptions, diagnoses, and illustrated keys to genera and… (more)

Subjects/Keywords: Biological Sciences; Bdelloidea; Forest litter; Interior highlands; Predatory mites; Entomology

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APA (6^th Edition):

Skvarla, M. J. (2011). Ozark Highland Cunaxidae (Acari: Prostigmata): Descriptions and keys to genera found to occur in the region and a new phylogenetic hypothesis for the family. (Masters Thesis). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/120

Chicago Manual of Style (16^th Edition):

Skvarla, Michael Joseph. “Ozark Highland Cunaxidae (Acari: Prostigmata): Descriptions and keys to genera found to occur in the region and a new phylogenetic hypothesis for the family.” 2011. Masters Thesis, University of Arkansas. Accessed December 10, 2019. https://scholarworks.uark.edu/etd/120.

MLA Handbook (7^th Edition):

Skvarla, Michael Joseph. “Ozark Highland Cunaxidae (Acari: Prostigmata): Descriptions and keys to genera found to occur in the region and a new phylogenetic hypothesis for the family.” 2011. Web. 10 Dec 2019.

Vancouver:

Skvarla MJ. Ozark Highland Cunaxidae (Acari: Prostigmata): Descriptions and keys to genera found to occur in the region and a new phylogenetic hypothesis for the family. [Internet] [Masters thesis]. University of Arkansas; 2011. [cited 2019 Dec 10]. Available from: https://scholarworks.uark.edu/etd/120.

Council of Science Editors:

Skvarla MJ. Ozark Highland Cunaxidae (Acari: Prostigmata): Descriptions and keys to genera found to occur in the region and a new phylogenetic hypothesis for the family. [Masters Thesis]. University of Arkansas; 2011. Available from: https://scholarworks.uark.edu/etd/120

University of Colorado

21. Retuta, Ariel Michelle. Effect of Heating Temperature on Dissolvable Constituents from Soil and Litter Material in the Colorado Front Range.

Degree: MS, 2018, University of Colorado

URL: https://scholar.colorado.edu/cven_gradetds/356

► Wildfires are a natural and ubiquitous phenomenon that leave behind a perturbed hydrologic environment. Post-fire landscapes become susceptible to erosion, decreased infiltration capacity, and soil… (more)

▼ Wildfires are a natural and ubiquitous phenomenon that leave behind a perturbed hydrologic environment. Post-fire landscapes become susceptible to erosion, decreased infiltration capacity, and soil hydrophobicity, which facilitate transport of post-fire residue into surface waters serving potable water sources. The risks posed by post-fire residue deposition to raw water sources and subsequent impairment of water quality are difficult to understand due to the complex nature of wildfire effects. Research indicates that soil organic matter (SOM) and plant material undergo chemical and structural changes following heating. As a result, water extractable organic matter from forest floor material altered by heat may be significantly different from that of unaltered material in quantity and quality. To address the impacts of ash on water quality, surface soils and litter were progressively heated to a range of temperatures (150 to 550˚C) and subsequently leached in water to evaluate changes in the release of dissolvable constituents as a function of burn temperature. Water quality parameters assessed include dissolved organic carbon (DOC), dissolved organic nitrogen (DON), dissolved inorganic nitrogen (DIN), fractions of water extractable organic carbon and nitrogen (WEOC and WEON), and soluble elements. The quality of dissolved organic matter (DOM) from unaffected and heat-impacted soil and litter was assessed using ultraviolet absorbance at 254 nm (SUVA₂₅₄). Following heating, the quantity and solubility of DOC and DON from soil were enhanced at 250˚C to 350˚C while the litter decreased drastically after material was heated above 150˚C. DOC contributions from litter across all temperatures exceeded that from soil while DON contributions for both materials were comparable. Soluble element trends varied; however, litter concentrations were magnitudes higher than soil for all except for Al and Mn, which were comparable. For both soil and litter leachates, SUVA₂₅₄ increased with increasing temperature, indicating a higher concentration of aromatic moieties for leachates of heat-impacted material. Findings contribute to the growing understanding of impacts wildfires have on water quality and helps identify major contributors (soil or litter) to water quality risk based on fire severity. Advisors/Committee Members: Fernando L. Rosario-Ortiz, R. Scott Summers, Deborah Martin.

Subjects/Keywords: forest fire; litter; soil; water quality; wildfire; Environmental Engineering; Environmental Studies

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APA (6^th Edition):

Retuta, A. M. (2018). Effect of Heating Temperature on Dissolvable Constituents from Soil and Litter Material in the Colorado Front Range. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/356

Chicago Manual of Style (16^th Edition):

Retuta, Ariel Michelle. “Effect of Heating Temperature on Dissolvable Constituents from Soil and Litter Material in the Colorado Front Range.” 2018. Masters Thesis, University of Colorado. Accessed December 10, 2019. https://scholar.colorado.edu/cven_gradetds/356.

MLA Handbook (7^th Edition):

Retuta, Ariel Michelle. “Effect of Heating Temperature on Dissolvable Constituents from Soil and Litter Material in the Colorado Front Range.” 2018. Web. 10 Dec 2019.

Vancouver:

Retuta AM. Effect of Heating Temperature on Dissolvable Constituents from Soil and Litter Material in the Colorado Front Range. [Internet] [Masters thesis]. University of Colorado; 2018. [cited 2019 Dec 10]. Available from: https://scholar.colorado.edu/cven_gradetds/356.

Council of Science Editors:

Retuta AM. Effect of Heating Temperature on Dissolvable Constituents from Soil and Litter Material in the Colorado Front Range. [Masters Thesis]. University of Colorado; 2018. Available from: https://scholar.colorado.edu/cven_gradetds/356

22. Magda Elisa Turini da Cunha. Indicadores químicos do efeito de borda em fragmentos de floresta da região de Londrina - Paraná.

Degree: 2007, Universidade Estadual de Londrina

URL: http://www.bibliotecadigital.uel.br/document/?code=vtls000124964

►

Florestas tropicais vêm sendo transformadas em mosaicos onde os fragmentos florestais se encontram em uma matriz agro-pastoril. A ação de elementos externos como radiação solar,… (more)

▼

Florestas tropicais vêm sendo transformadas em mosaicos onde os fragmentos florestais se encontram em uma matriz agro-pastoril. A ação de elementos externos como radiação solar, vento, pesticidas e fertilizantes faz a floresta próxima à borda se diferenciar do interior. As características químicas do solo e da serapilheira foram estudadas em sete fragmentos de florestas nativas da região de Londrina, PR no período de agosto/2004 a julho/2005, com intuito de verificar a relação entre alterações na composição de espécies arbóreas e a ciclagem de nutrientes nesses locais. Foram realizadas coletas mensais de serapilheira e a fração foliar foi submetida a análises de nutrientes como N, P K, Ca e Mg. Amostras de solo superficial (0 ? 20 cm) foram coletadas nas parcelas para análise química e isotópica. As características químicas e isotópicas foram correlacionadas com as espécies arbóreas. A produção anual de serapilheira na borda florestal foi maior do que a 70 m para o interior da floresta. As maiores taxas de transferência dos nutrientes Mg e P para o solo foram encontradas na borda e a 35 m para o interior da floresta. Cálcio e Mg foram utilizados com mais eficiência pelas plantas a 70m e 0m da borda, respectivamente. A composição isotópica do solo da borda florestal apresentou enriquecimento em 13C devido principalmente a altas taxas de luminosidade a que plantas presentes na borda são submetidas, e apresentou enriquecimento também em 15N devido principalmente à influência da fertilização de áreas agrícolas próximas às bordas. Não foi possível verificar a presença de efeito de borda através da correlação: entre características químicas do solo e composição de espécies.

Tropical forests have been transformed in mosaics where the forest fragments are in an agricultural matrix or pasture. The external action of elements as solar radiation, wind, pesticides and fertilizers make the close forest to the border if differentiates of the interior. The soil and litter chemical characteristics were studied in seven native forest fragments in Londrina, PR region from August/ 2004 to July/ 2005, to verifying the relationship among alterations in the arboreal composition of species and the nutrients cycling those places.. Monthly collections of litter were performed and nutrients concentations of N, P K, Ca and Mg in foliar fraction was determinated. Superficial soil samples (0 - 20 cm) were submited for chemical and isotopic analysis. The chemical and isotopics characteristics were correlated with the arboreal species. The annual litter production in edge was higher as interior. The transference of nutrients Mg and P from the vegetation to the soil was higher in edge and 35 m. Ca and Mg were used more efficiently by the plants at 70 m and 0 meters from the edge, respectively. Plants of the interior use efficiency Ca, while Mg was better used by edge species. The soil isotopic composition in edge presented enrichment in 13C owed to high luminosity rate what species of the edge are submitted, and presented enrichment also in 15N…

Advisors/Committee Members: Efrain Rodrigues, Ph.D. ., Hideaki Wilson Takahashi, José Marcelo Torezan.

Subjects/Keywords: Solos florestais; Serapilheira; Ciclo mineral (Biogeoquímica); Forest soils; Forest litter; Mineral cycle (Biogeochemistry)

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APA (6^th Edition):

Cunha, M. E. T. d. (2007). Indicadores químicos do efeito de borda em fragmentos de floresta da região de Londrina - Paraná. (Thesis). Universidade Estadual de Londrina. Retrieved from http://www.bibliotecadigital.uel.br/document/?code=vtls000124964

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

Chicago Manual of Style (16^th Edition):

Cunha, Magda Elisa Turini da. “Indicadores químicos do efeito de borda em fragmentos de floresta da região de Londrina - Paraná.” 2007. Thesis, Universidade Estadual de Londrina. Accessed December 10, 2019. http://www.bibliotecadigital.uel.br/document/?code=vtls000124964.

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

MLA Handbook (7^th Edition):

Cunha, Magda Elisa Turini da. “Indicadores químicos do efeito de borda em fragmentos de floresta da região de Londrina - Paraná.” 2007. Web. 10 Dec 2019.

Vancouver:

Cunha METd. Indicadores químicos do efeito de borda em fragmentos de floresta da região de Londrina - Paraná. [Internet] [Thesis]. Universidade Estadual de Londrina; 2007. [cited 2019 Dec 10]. Available from: http://www.bibliotecadigital.uel.br/document/?code=vtls000124964.

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

Council of Science Editors:

Cunha METd. Indicadores químicos do efeito de borda em fragmentos de floresta da região de Londrina - Paraná. [Thesis]. Universidade Estadual de Londrina; 2007. Available from: http://www.bibliotecadigital.uel.br/document/?code=vtls000124964

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

McGill University

23. Pelletier, Bernard, 1964-. A multivariate analysis of tree species influence on forest floor fertility.

Degree: MS, Department of Natural Resource Sciences., 1993, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile68239.pdf

► The objective of this study was to assess tree species influence on forest floor fertility in a mixed forest stand using Redundancy Analysis (RDA). Eighty… (more)

Subjects/Keywords: Forest soils.; Forest litter.; Soil fertility

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APA (6^th Edition):

Pelletier, Bernard, 1. (1993). A multivariate analysis of tree species influence on forest floor fertility. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile68239.pdf

Chicago Manual of Style (16^th Edition):

Pelletier, Bernard, 1964-. “A multivariate analysis of tree species influence on forest floor fertility.” 1993. Masters Thesis, McGill University. Accessed December 10, 2019. http://digitool.library.mcgill.ca/thesisfile68239.pdf.

MLA Handbook (7^th Edition):

Pelletier, Bernard, 1964-. “A multivariate analysis of tree species influence on forest floor fertility.” 1993. Web. 10 Dec 2019.

Vancouver:

Pelletier, Bernard 1. A multivariate analysis of tree species influence on forest floor fertility. [Internet] [Masters thesis]. McGill University; 1993. [cited 2019 Dec 10]. Available from: http://digitool.library.mcgill.ca/thesisfile68239.pdf.

Council of Science Editors:

Pelletier, Bernard 1. A multivariate analysis of tree species influence on forest floor fertility. [Masters Thesis]. McGill University; 1993. Available from: http://digitool.library.mcgill.ca/thesisfile68239.pdf

Humboldt State University

24. Pillers, Michael D. Fine fuel dynamics of old-growth redwood forests.

Degree: MS, Natural Resources, 1989, Humboldt State University

URL: http://hdl.handle.net/2148/888

► Litterfall and litter decomposition were measured for two years at four sites in old-growth redwood (Sequoia sempervirens) forests. Sites were selected to represent sloped and… (more)

▼ Litterfall and litter decomposition were measured for two years at four sites in old-growth redwood (Sequoia sempervirens) forests. Sites were selected to represent sloped and flat areas at inland and coastal locations. Both a litterbag and an in situ, mass balance style of analysis were used to determine decomposition rates. Litterfall, decomposition rates and, forest floor litter layer loadings were used to model equilibrium (decomposition=litterfall) litter loads and the time required to attain them. Average annual litterfall at the four sites ranged from 3122 kg ha-1 yr-1 to 4687 kg ha-1 yr-1. Pseudotsuga menziesii litter exhibited the fastest decomposition rates, losing an average of 55 per cent of its original weight at the end of two years. Lithocarpus densiflorus lost 50 per cent and S. sempervirens, 42 per cent. Decomposition rate constants (k) calculated from the litterbag analysis ranged from .273 to .405. Values of k estimated from the mass balance analysis were slightly lower, ranging from .210 to .262. Equilibrium litter loads estimated with the modeling procedure ranged from 7760 kg/ha to 14,500 kg/ha. In comparison, samplings of existing forest floor litter loads resulted in estimations of 14,340 kg/ha to 22,300 kg/ha. Times required for the litter layers to reach equilibrium were estimated to be 7 to 11 years with the litterbag analysis and from 11 to 20 years with the mass balance study. Statistical analysis suggested that, for the two year period, S. sempervirens litterfall at the sloped, inland site was significantly lighter (p<.05) than the other three sites. No statistically significant differences (p<.05) in decomposition rates were found among the four sites in the litterbag analysis. In the mass balance study, the existing litter layer at the coastal flat site was significantly thinner (p<.05) than the inland flat and coastal sloped sites while the litter at the inland sloped site was significantly thicker. Advisors/Committee Members: Stuart, John.

Subjects/Keywords: Forest litter – California; Forest litter – Biodegradation; Fire ecology – California; Redwood; Coast redwood

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APA (6^th Edition):

Pillers, M. D. (1989). Fine fuel dynamics of old-growth redwood forests. (Masters Thesis). Humboldt State University. Retrieved from http://hdl.handle.net/2148/888

Chicago Manual of Style (16^th Edition):

Pillers, Michael D. “Fine fuel dynamics of old-growth redwood forests.” 1989. Masters Thesis, Humboldt State University. Accessed December 10, 2019. http://hdl.handle.net/2148/888.

MLA Handbook (7^th Edition):

Pillers, Michael D. “Fine fuel dynamics of old-growth redwood forests.” 1989. Web. 10 Dec 2019.

Vancouver:

Pillers MD. Fine fuel dynamics of old-growth redwood forests. [Internet] [Masters thesis]. Humboldt State University; 1989. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/2148/888.

Council of Science Editors:

Pillers MD. Fine fuel dynamics of old-growth redwood forests. [Masters Thesis]. Humboldt State University; 1989. Available from: http://hdl.handle.net/2148/888

Montana Tech

25. Wordell, Thomas A. Inorganic Content of forest Floor Layers Under Ponderosa Pine and Grand Fir Cover Types in the blue Mountains of Northeast Oregon.

Degree: MS, 1995, Montana Tech

URL: https://scholarworks.umt.edu/etd/5684

Subjects/Keywords: Forest litter Blue Mountains (Or. and Wash.); Forest litter Analysis.

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APA (6^th Edition):

Wordell, T. A. (1995). Inorganic Content of forest Floor Layers Under Ponderosa Pine and Grand Fir Cover Types in the blue Mountains of Northeast Oregon. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/5684

Chicago Manual of Style (16^th Edition):

Wordell, Thomas A. “Inorganic Content of forest Floor Layers Under Ponderosa Pine and Grand Fir Cover Types in the blue Mountains of Northeast Oregon.” 1995. Masters Thesis, Montana Tech. Accessed December 10, 2019. https://scholarworks.umt.edu/etd/5684.

MLA Handbook (7^th Edition):

Wordell, Thomas A. “Inorganic Content of forest Floor Layers Under Ponderosa Pine and Grand Fir Cover Types in the blue Mountains of Northeast Oregon.” 1995. Web. 10 Dec 2019.

Vancouver:

Wordell TA. Inorganic Content of forest Floor Layers Under Ponderosa Pine and Grand Fir Cover Types in the blue Mountains of Northeast Oregon. [Internet] [Masters thesis]. Montana Tech; 1995. [cited 2019 Dec 10]. Available from: https://scholarworks.umt.edu/etd/5684.

Council of Science Editors:

Wordell TA. Inorganic Content of forest Floor Layers Under Ponderosa Pine and Grand Fir Cover Types in the blue Mountains of Northeast Oregon. [Masters Thesis]. Montana Tech; 1995. Available from: https://scholarworks.umt.edu/etd/5684

McGill University

26. Turgeon, Julie. Production and biodegradation of dissolved carbon, nitrogen and phosphorus from Canadian forest floors.

Degree: PhD, Department of Geography., 2008, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile115710.pdf

►

Dissolved organic matter (DOM) is operationally defined as soluble/colloidal material passing through a 0.45mum filter paper. The importance of DOM in soils relies on its… (more)

▼

Dissolved organic matter (DOM) is operationally defined as soluble/colloidal material passing through a 0.45mum filter paper. The importance of DOM in soils relies on its role in soil formation and weathering processes, plant and microbial assimilation and soil and water acidification. However, the scientific community studying DOM still disagrees on whether fresh or humified material is the major source of DOM within the forest floor. One of the factors that could influence the overall importance of DOM production by organic horizons is its potential for biodegradability. In addition, the interaction occurring between the nutrients (i.e. nitrogen (N) and phosphorus (P)) and carbon (C) substrate is believed to be of major importance.

To acquire more knowledge on the production and biodegradation of dissolved C, N and P during decomposition of organic matter (OM), I performed laboratory incubations to evaluate rates of production and transformation, the influence of the degree of OM decomposition and stand type on these rates, and the stoichiometric relationships of the different quotients during the incubations. First, I performed a 30-day incubation of coniferous and deciduous OM from 10 Canadian forest floors representing various degrees of OM decomposition and subsequently measured the amount of: dissolved organic carbon (DOC), total dissolved nitrogen (TDN), nitrate (NO3-N), ammonium (NH4-N), dissolved organic nitrogen (DON), total dissolved phosphorus (TOP) and carbon dioxide (CO2-C). I performed water extractions with the same set of samples to evaluate the biodegradability of DOC and DON and the transformations of TDN, NO3-N and NH4-N.

Fresh material produces more DOM than humified material; material in the midpoint of decomposition (F horizon) produced the largest amount of DIN. Coniferous and deciduous samples did not display different rates of DOM production, most likely because of the overshadowing effect of OM degree of decomposition. I found strong links between the organic matter and dissolved phase C and N content and C:N quotient. The biodegradation, measured as DOC disappearance and mineralization of CO2-C, showed a discrepancy, reflecting the importance of increasing microbial biomass at the beginning of the incubation in response to priming effect. The sharp decrease of TDN and DON observed in the first few days of the incubation, in addition to increasing amount of dissolved inorganic N as waste products during decomposition of DON, supports this hypothesis. A better understanding of the dynamics of dissolved C, N and P in soil is essential to further understand their role in global elemental cycles, including climate change, forest management and pollution.

Subjects/Keywords: Forest litter – Canada.; Forest litter – Biodegradation – Canada.; Soils – Organic compound content – Canada.

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

APA (6^th Edition):

Turgeon, J. (2008). Production and biodegradation of dissolved carbon, nitrogen and phosphorus from Canadian forest floors. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile115710.pdf

Chicago Manual of Style (16^th Edition):

Turgeon, Julie. “Production and biodegradation of dissolved carbon, nitrogen and phosphorus from Canadian forest floors.” 2008. Doctoral Dissertation, McGill University. Accessed December 10, 2019. http://digitool.library.mcgill.ca/thesisfile115710.pdf.

MLA Handbook (7^th Edition):

Turgeon, Julie. “Production and biodegradation of dissolved carbon, nitrogen and phosphorus from Canadian forest floors.” 2008. Web. 10 Dec 2019.

Vancouver:

Turgeon J. Production and biodegradation of dissolved carbon, nitrogen and phosphorus from Canadian forest floors. [Internet] [Doctoral dissertation]. McGill University; 2008. [cited 2019 Dec 10]. Available from: http://digitool.library.mcgill.ca/thesisfile115710.pdf.

Council of Science Editors:

Turgeon J. Production and biodegradation of dissolved carbon, nitrogen and phosphorus from Canadian forest floors. [Doctoral Dissertation]. McGill University; 2008. Available from: http://digitool.library.mcgill.ca/thesisfile115710.pdf

McGill University

27. Turgeon, Julie. Production and Biodegradation of Dissolved Carbon, Nitrogen and Phosphorous from Canadian Forest Floors.

Degree: PhD, Department of Geography, 2009, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile105310.pdf

►

Dissolved organic matter (DOM) is operationally defined as soluble/colloidal material passing through a 0.45~m filter paper. The importance of DOM in soils relies on its… (more)

Subjects/Keywords: Forest litter – Canada.; Forest litter – Biodegradation – Canada.; Soils – Organic compound content – Canada.

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APA (6^th Edition):

Turgeon, J. (2009). Production and Biodegradation of Dissolved Carbon, Nitrogen and Phosphorous from Canadian Forest Floors. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile105310.pdf

Chicago Manual of Style (16^th Edition):

Turgeon, Julie. “Production and Biodegradation of Dissolved Carbon, Nitrogen and Phosphorous from Canadian Forest Floors.” 2009. Doctoral Dissertation, McGill University. Accessed December 10, 2019. http://digitool.library.mcgill.ca/thesisfile105310.pdf.

MLA Handbook (7^th Edition):

Turgeon, Julie. “Production and Biodegradation of Dissolved Carbon, Nitrogen and Phosphorous from Canadian Forest Floors.” 2009. Web. 10 Dec 2019.

Vancouver:

Turgeon J. Production and Biodegradation of Dissolved Carbon, Nitrogen and Phosphorous from Canadian Forest Floors. [Internet] [Doctoral dissertation]. McGill University; 2009. [cited 2019 Dec 10]. Available from: http://digitool.library.mcgill.ca/thesisfile105310.pdf.

Council of Science Editors:

Turgeon J. Production and Biodegradation of Dissolved Carbon, Nitrogen and Phosphorous from Canadian Forest Floors. [Doctoral Dissertation]. McGill University; 2009. Available from: http://digitool.library.mcgill.ca/thesisfile105310.pdf

University of Hong Kong

28. Lam, Kwan-sing, Paul. Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv.ex B1. (moraceae).

Degree: M. Phil., 1984, University of Hong Kong

URL: Lam, K. P. [林群聲]. (1984). Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv. ex B1. (moraceae). (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120656 ; http://dx.doi.org/10.5353/th_b3120656 ; http://hdl.handle.net/10722/33223

published_or_final_version

Zoology

Master

Master of Philosophy

Subjects/Keywords: Forest litter - Biodegradation - Environmental aspects.; Moraceae.

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APA (6^th Edition):

Lam, Kwan-sing, P. (1984). Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv.ex B1. (moraceae). (Masters Thesis). University of Hong Kong. Retrieved from Lam, K. P. [林群聲]. (1984). Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv. ex B1. (moraceae). (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120656 ; http://dx.doi.org/10.5353/th_b3120656 ; http://hdl.handle.net/10722/33223

Chicago Manual of Style (16^th Edition):

Lam, Kwan-sing, Paul. “Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv.ex B1. (moraceae).” 1984. Masters Thesis, University of Hong Kong. Accessed December 10, 2019. Lam, K. P. [林群聲]. (1984). Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv. ex B1. (moraceae). (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120656 ; http://dx.doi.org/10.5353/th_b3120656 ; http://hdl.handle.net/10722/33223.

MLA Handbook (7^th Edition):

Lam, Kwan-sing, Paul. “Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv.ex B1. (moraceae).” 1984. Web. 10 Dec 2019.

Vancouver:

Lam, Kwan-sing P. Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv.ex B1. (moraceae). [Internet] [Masters thesis]. University of Hong Kong; 1984. [cited 2019 Dec 10]. Available from: Lam, K. P. [林群聲]. (1984). Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv. ex B1. (moraceae). (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120656 ; http://dx.doi.org/10.5353/th_b3120656 ; http://hdl.handle.net/10722/33223.

Council of Science Editors:

Lam, Kwan-sing P. Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv.ex B1. (moraceae). [Masters Thesis]. University of Hong Kong; 1984. Available from: Lam, K. P. [林群聲]. (1984). Ecological studies of litter production and decomposition in a mixed forest in Hong Kong with special reference to ficus fistulosa reinv. ex B1. (moraceae). (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120656 ; http://dx.doi.org/10.5353/th_b3120656 ; http://hdl.handle.net/10722/33223

University of Hong Kong

29. 梁慶祥; Leung, Hing-cheung. Aspects of leaf litter decomposition in Kandelia candel (L.) Druce.

Degree: M. Phil., 1986, University of Hong Kong

URL: Leung, H. [梁慶祥]. (1986). Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120772 ; http://dx.doi.org/10.5353/th_b3120772 ; http://hdl.handle.net/10722/33122

published_or_final_version

Botany

Master

Master of Philosophy

Subjects/Keywords: Forest litter - Biodegradation.; Kandelia candel - Biodegradation.

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APA (6^th Edition):

梁慶祥; Leung, H. (1986). Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. (Masters Thesis). University of Hong Kong. Retrieved from Leung, H. [梁慶祥]. (1986). Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120772 ; http://dx.doi.org/10.5353/th_b3120772 ; http://hdl.handle.net/10722/33122

Chicago Manual of Style (16^th Edition):

梁慶祥; Leung, Hing-cheung. “Aspects of leaf litter decomposition in Kandelia candel (L.) Druce.” 1986. Masters Thesis, University of Hong Kong. Accessed December 10, 2019. Leung, H. [梁慶祥]. (1986). Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120772 ; http://dx.doi.org/10.5353/th_b3120772 ; http://hdl.handle.net/10722/33122.

MLA Handbook (7^th Edition):

梁慶祥; Leung, Hing-cheung. “Aspects of leaf litter decomposition in Kandelia candel (L.) Druce.” 1986. Web. 10 Dec 2019.

Vancouver:

梁慶祥; Leung H. Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. [Internet] [Masters thesis]. University of Hong Kong; 1986. [cited 2019 Dec 10]. Available from: Leung, H. [梁慶祥]. (1986). Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120772 ; http://dx.doi.org/10.5353/th_b3120772 ; http://hdl.handle.net/10722/33122.

Council of Science Editors:

梁慶祥; Leung H. Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. [Masters Thesis]. University of Hong Kong; 1986. Available from: Leung, H. [梁慶祥]. (1986). Aspects of leaf litter decomposition in Kandelia candel (L.) Druce. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3120772 ; http://dx.doi.org/10.5353/th_b3120772 ; http://hdl.handle.net/10722/33122

University of Saskatchewan

30. Jean, Melanie 1987-. Effects of leaf litter and environment on bryophytes in boreal forests of Alaska.

Degree: 2017, University of Saskatchewan

URL: http://hdl.handle.net/10388/8247

► Bryophytes dominate the forest floor, regulate soil microclimate, and participate in the carbon (C) and nitrogen (N) cycles in coniferous boreal forests, while deciduous stands… (more)

▼ Bryophytes dominate the forest floor, regulate soil microclimate, and participate in the carbon (C) and nitrogen (N) cycles in coniferous boreal forests, while deciduous stands support a lower bryophyte abundance. Recent increases in fire severity throughout the northwestern boreal forest could result in a shift from conifer to deciduous dominated stands. Although broadleaf litter is hypothesized to be detrimental to bryophytes, little is known regarding the mechanisms through which forest canopies affect moss communities and ecosystem processes. In this study, I explored how canopy type and leaf litter affect bryophyte succession, growth, and associated N2-fixation in interior Alaska. I quantified bryophyte communities in a 163-year chronosequence in deciduous-broadleaf and coniferous stands. Bryophyte communities diverged at about 40 years after fire, with low bryophyte cover in mature deciduous forests and high bryophyte cover in mature coniferous forests, which was associated with increased leaf litter in deciduous stands. I then directly tested leaf litter as the main mechanism explaining this discrepancy in bryophyte abundance between the two forest types using a field-based experiment. I used transplants of a common bryophyte, the feather moss Hylocomium splendens (Hewd) Schimp., in deciduous and coniferous stands with manipulations of broadleaf litter to quantify the impacts of leaf litter on moss growth. I found that leaf litter had a much larger detrimental impact on moss growth than the other environmental characteristics of deciduous and coniferous stands, therefore providing experimental support to this previously hypothesized mechanism. Lastly, feather mosses are known to host N2-fixing cyanobacteria, but little is known regarding how this ecosystem process varies temporally, spatially, or among forest types. I measured N2-fixation rates in feather mosses over three years using stable isotope labelling (15N2). I found that N2-fixation rates were extremely variable among years and were linked to precipitation. Feather moss contribution to ecosystem N-budgets remained low in deciduous stands, while they were much higher and variable in coniferous stands. Changes in canopy composition and associated changes in leaf litter inputs induced by climate change will have profound impacts on moss communities, and may have cascading impacts on forest structure and composition. Advisors/Committee Members: Johnstone, Jill F, Mack, Michelle C, Sheard, John W, Lamb, Eric G, Knight, Diane J.

Subjects/Keywords: boreal forest; bryophyte; moss; nutrient cycling; succession; leaf litter; fire; canopy effects

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APA (6^th Edition):

Jean, M. 1. (2017). Effects of leaf litter and environment on bryophytes in boreal forests of Alaska. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/8247

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

Chicago Manual of Style (16^th Edition):

Jean, Melanie 1987-. “Effects of leaf litter and environment on bryophytes in boreal forests of Alaska.” 2017. Thesis, University of Saskatchewan. Accessed December 10, 2019. http://hdl.handle.net/10388/8247.

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

MLA Handbook (7^th Edition):

Jean, Melanie 1987-. “Effects of leaf litter and environment on bryophytes in boreal forests of Alaska.” 2017. Web. 10 Dec 2019.

Vancouver:

Jean M1. Effects of leaf litter and environment on bryophytes in boreal forests of Alaska. [Internet] [Thesis]. University of Saskatchewan; 2017. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/10388/8247.

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

Council of Science Editors:

Jean M1. Effects of leaf litter and environment on bryophytes in boreal forests of Alaska. [Thesis]. University of Saskatchewan; 2017. Available from: http://hdl.handle.net/10388/8247

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

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