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 20 of 251 for “"carbon and nitrogen"”.
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Carbon and nitrogen cycling in vegetated coastal ecosystems
… play a disproportionate role in greenhouse gas (carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O)) and nutrient cycling. Vegetated coastal ecosystems (e.g., mangroves, salt marshes, and seagrasses) are key drivers of coastal greenhouse gas and nutrient cycling because of their …
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Soil carbon and nitrogen cycle modeling for bioenergy crops
Due to the increase in the demands for bioenergy, considerable areas in the Midwestern United States (US) could be converted into croplands for second generation bioenergy, such as the cultivation of miscanthus and switchgrass. Study on the effect of the expansion of these crops on soil carbon and …
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Carbon and nitrogen removal in a granular bed baffled reactor
… concerns for the treatment of high strength carbonaceous wastewaters in anaerobic systems is to achieve an optimum growth environment for acidogenesis and methanogenesis. Such wastewaters with high nutrient levels could cause additional problems as anaerobic units are usually designed for the …
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Carbon and nitrogen mineralization in temperate forest soils at low temperatures
In the past, carbon (C) and nitrogen (N) mineralization in temperate forest soils was often considered negligible at low temperatures during the dormant season, which is questioned by recent findings. Climate models predict warmer winters but little is known about the temperature sensitivity of C …
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Polarization in the elastic scattering of protons from carbon and nitrogen
… of protons elastically scattered from nitrogen and carbon has been measured using double scattering techniques 0 The polarization was determined for nitrogen at a scattering angle of 48°c .mo in the proton energy interval 7.6 to 11.8 MeV. The polarization from carbon '~as determined …
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Soil carbon and nitrogen dynamics affected by tillage and cover cropping
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Regulatory mechanisms underlying C3 carbon and nitrogen metabolism under elevated CO2
… will affect species-specific responses to carbon (C) gain in plants, in turn impacting plant productivity in natural and agro-ecosystems in the future. Several interacting environmental and genetic factors affect species-specific response to C gain under elevated atmospheric CO2 …
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Carbon and Nitrogen Dynamics of a Lagoon Salt Marsh in Davenport, California
<p>Wetlands are complex environments that play a critical role in regulating the global biogeochemical cycle of carbon (C) and nitrogen (N). Wetlands are critical contributors to global climate change and atmospheric chemistry since they store as much as 33% of the world’s soil organic carbon …
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A size-based model of carbon and nitrogen flows in plankton communities
… is developed to investigate the dynamics of carbon and nitrogen flows in plankton communities. All parameters in the model are determined by body size using empirically-determined relationships calculated from published data. The model is robust with respect to most parameters and …
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Organic amendment effects on carbon and nitrogen mineralization in an Appalachian minesoil
… as a topsoil substitute during surface-mined land reclamation is practiced in areas with thin, unrecoverable topsoil. The long-term productivity of topsoil substitutes has often been difficult to maintain under forage and row crops. The objective of this project was to evaluate the …
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CARBON AND NITROGEN CYCLING IN GIANT CANE (ARUNDINARIA GIGANTEA (WALT.) MUHL.) RIPARIAN ECOSYSTEMS
Large stands of Arundinaria gigantea (Walt.) Muhl., called canebrakes, were vital to wildlife and lowland ecosystem functions and historically covered millions of acres in the southeastern United States. Since European settlement, human disturbance (i.e, clearing for agriculture and fire …
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Examining the Role of Climate, Carbon and Nitrogen Interactions in the Terrestrial Biosphere
… thesis, a comprehensive model of terrestrial nitrogen (N) dynamics is developed and coupled with the geographically explicit terrestrial C cycle model of ISAM. Observations from the Long-term Intersite Decomposition Experiment (LIDET) dataset were compiled for the calibration and validation of …
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Understanding the impact of residue and nitrogen inputs on soil carbon and nitrogen dynamics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Mechanistic drivers of mycorrhizal type effects on soil carbon and nitrogen cycling across scales
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Carbon and nitrogen cycling and soil quality under long-term crop rotation and tillage
This Dissertation was approved for publication on 2016-12-22 at 11:25.
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The Effects of Biochar and Reactive Iron Additions on Soil Carbon and Nitrogen Retention
… as part of global efforts to conserve nutrients and enhance carbon (C) sequestration. But reliably increasing SOM has proven difficult because most of the organic matter that enters soil as plant litter and organic amendments (i.e., compost, manure) is susceptible to decomposition by soil …
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Belowground Carbon and Nitrogen Cycling in a Loblolly Pine Forest Managed for Bioenergy Production
… fuel combustion has intensified research into carbon-neutral energy and fuel production. Therefore, bioenergy production has expanded during the last decade, increasing demand for forest-based bioenergy feedstocks. Millions of acres of privately and industrially owned pine plantations exist …
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Tree species effects on the release of dissolved organic carbon and nitrogen from decomposing logs
Besides carbon dioxide emissions, the leaching of dissolved organic carbon (DOC) and nitrogen (DON) is the most important process contributing to the mass loss of coarse woody debris (CWD comprising all dead woody material with at least >7 cm in diameter). Increased DOC and nitrogen (N) inputs into …
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Carbon and Nitrogen Dynamics in High Intensity Minimal Exchange Shrimp (<i>Litopenaeus vannamei</i>) Raceways
… between the 2 density treatments, (2) construct carbon and nitrogen budgets to see where the carbon and nitrogen went in the system for all growouts, (3) determine if plastic media had any effects on water quality parameters and shrimp production, (4) determine if plastic media allowed for a …
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