Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"soil biogeochemistry"”.
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Soil chemistry and ecology on a restoration trajectory of a coastal sandplain forest, Punakaiki, New Zealand
… the interactive role of vegetation and soil biogeochemistry on an ecological restoration trajectory on the West Coast of New Zealand. The Punakaiki Coastal Restoration Project (PCRP) was developed to restore degraded land to a more natural vegetation, resembling the original sandplain …
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Towards Sociobiogeochemistry: Critical Perspectives on Anthropogenic Alterations to Soil Nitrogen Chemistry via U.S. Urban and Suburban Development
… component of ecosystem functioning, changes to soil biogeochemistry have significant effects on overall ecosystem health. With cities continuing to grow and develop in extent, the impacts of urbanization and suburbanization on soils are of particular concern. Despite a wide range of natural …
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Short Rotation Forestry and Earthworm Diversity: Impacts and Responses
… and quantity of leaf litter, and its impact on soil fauna, of which the earthworm community is a major component. Earthworms have direct impacts on the soil biogeochemistry of SRF systems, and the tree species can impact on the associated earthworm community. The aim of this study was to …
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Quantifying biophysical and biogeochemical influence on northern high latitudes greenhouse gases dynamics
… chemical interactions within the atmosphere-land-soil continuum determined the production, transport and flux of GHGs from site to regional and global scales. I focused on the impacts of three key GHGs that can largely contribute to climate change in terrestrial processes: (1) Carbon Dioxide …
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Oligohaline wetland response and recovery following storm-driven saltwater intrusion in coastal Louisiana
… changes to coastal wetland plant communities and soils by changing the environmental conditions in which they exist. Here I examined the impacts of storm-induced saltwater intrusion and post-intrusion conditions on the structure and growth of an oligohaline wetland plant community, and on wetland …
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Soil microbial response to land management practices and wildfire in Appalachian ecosystems
… is critically controlled by the activity of soil microbial communities. Understanding how soil microbial communities change as a result of different land management practices or natural disturbances can provide insight into the effects of these perturbations on ecosystem health, such as water …
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Understanding seed-soil adhesion by myxospermous seeds and their biophysical function in agroecosystems
… services that support wildlife and regulate soil function. The fate of arable seeds is vital in shaping the aboveground composition of plant communities in agroecosystems. Understanding seed fate informs seedbank dynamics with multi-species interactions, as well as safeguarding arable …
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The Influence of Selection Silviculture Biomass Harvesting on Soil Carbon, Nutrients, and Respiration in a Northern Mixed-Deciduous Forest
Concerns have been raised about soil fertility following increased recovery of biomass in northern mixed deciduous forests. Several studies suggest that biomass extraction and enhanced decomposer activity can lead to losses of soil C and nutrients, increased nitrification, and reduced soil CO2 …
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Seasonal responses of carbon, nitrogen, and phosphorus cycling to woodland reduction and different organic matter additions in the semiarid Great Basin
… carry ecosystem-level consequences because soil microorganisms can immobilize nutrients or render them available for plant uptake. The stochastic nature of resource availability in drylands may cause these ecosystems to be particularly susceptible to disturbance. We used two common fuel …
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The Effect of Prescribed Burning on Soil Microbial Communities, Nutrients, and Carbon Dioxide Fluxes Under and Between Sagebrush Canopies in the Semi-Arid Rangelands of Northern Nevada
… to cause immediate and long-term changes to soil microbial communities, nutrient dynamics, and carbon dioxide (CO2) fluxes. These changes can have direct and indirect effects on soil biochemistry and respiration. The effects of fire on soil largely depend on time and seasonality, frequency, …
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Effects of different canopy tree species on belowground biogeochemistry in a wet lowland tropical forest
… standing litter varied by species, as did total soil and microbial C and N pools. Rates of soil extracellular acid phosphatase activity (Ptase) varied both by species and functional group, with higher rates of Ptase activity observed under legumes. In addition, Ptase activity was significantly …
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Effects of different canopy tree species on belowground biogeochemistry in a wet lowland tropical forest
… standing litter varied by species, as did total soil and microbial C and N pools. Rates of soil extracellular acid phosphatase activity (Ptase) varied both by species and functional group, with higher rates of Ptase activity observed under legumes. In addition, Ptase activity was significantly …
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Macro to Micro Legacies of Landuse at the Calhoun Critical Zone Observatory
… diagnostic of landuse history and, 3) plot-based soil investigations of three chronosequence landuse histories approximating the temporal successional progression from pre-disturbance forested landcover into deforested agricultural management and finally into secondary old-field mixed pine forests …
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Impacts of model-data uncertainties on biogeophysical-biogeochemical interactions in a land surface model (with an emphasis on the northern high-latitude regions)
… energy/water fluxes) and reservoirs (e.g., soil carbon stocks). In continuation from Chapter 2, I used the ISAM in Chapter 3 to extend the analysis for biases in ecosystem energy and water fluxes arising due to the use of the meteorological reanalysis of the NCEP/NCAR and the CRUNCEP. In …