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 47 for “"carbon balance"”.
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Nitrogen and carbon balance of lactating Holstein cows during early and midlactation
… 2 factorial design to evaluate nitrogen (N) and carbon (C) partitioning to milk, urine, feces, and body tissue during early and midlactation. Diets containing 16% CP were formulated with 30 or 39% rumen undegradable protein (RUP) obtained by substituting blood meal (EM) for soybean meal (SBM). …
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Plant root contributions to the carbon balance of a changing agricultural Midwest
The long-term carbon balance of the agricultural Midwestern United States will depend on the interactions between climate, land use decisions, plant biology, and biogeochemistry. In agricultural systems, C storage is fully determined by belowground pools, so it is vital to understand the links …
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The modeled effects of fire on carbon balance and vegetation abundance in Alaskan tundra
… Whether tundra remains a global net sink of carbon could depend upon the effects of fire on vegetation, specifically concerning the speed at which vegetation reestablishes, the stimulation of growth after fire, and the changes that occur in species composition during succession. While rapid …
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Tree Growth and Carbon Balance in a Temperate Forest Exposed to Elevated Carbon Dioxide for Eight Years
… atmosphere have focused attention on the global carbon cycle. Increases in atmospheric CO2 concentrations strongly influence plant carbon uptake and because forests account for the bulk of terrestrial productivity the future role of forests in the carbon cycle is a subject of current scientific …
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Process-based simulation of the terrestrial biosphere : an evaluation of present-day and future terrestrial carbon balance estimates and their uncertainty
At present, carbon sequestration in terrestrial ecosystems slows the growth rate of atmospheric CO2 concentrations, and thereby reduces the impact of anthropogenic fossil fuel emissions on the climate system. Changes in climate and land use affect terrestrial biosphere structure and functioning at …
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Idenfitying and Understanding North American Carbon Cycle Perturbations from Natural and Anthropogenic Disturbances
Carbon dioxide accumulating in our atmosphere is one of the most important environmental threats of our time. Humans and changing climate, separately or in concert, have affected global vegetation, biogeochemical cycles, biophysical processes, and primary production. Recent studies have found …
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From land to water: the impacts of forest disturbances on carbon cycling in northern catchments
… and in combination, impact the overall resource balance of northern forests remains poorly understood. This thesis aims to advance our understanding of forest disturbances as drivers of forest resource balances, primarily through shifts in carbon, to better facilitate management of forests under …
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Mesoscale Wind and Temperature Changes over Peatlands of the Hudson Bay Lowlands: impacts on the Surface Energy Balance and Net CO2 Exchange
… peatlands in general are currently a net carbon sink, there is still considerable uncertainty in the long-term combined response of plant productivity and ecosystem respiration to global warming and moisture changes. The Hudson Bay Lowlands (HBL) region of Canada is the second largest …
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Non-growing season CO2 fluxes of a boreal fen – key drivers and responses to anomalous winter conditions
Non-growing season carbon fluxes can contribute to a significant amount of the full-year ecosystem carbon balance. Year-round net ecosystem exchange (NEE) data from 17 years was used to analyse the non-growing season carbon dioxide (CO2) fluxes together with environmental and meteorological …
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Biochar amendment as a tool for improving soil health and carbon sequestration in agro-ecosystems
… farming practices and land-use conversions drive carbon out of soil and into the atmosphere, where it contributes to climate change. Biochar, a soil amendment produced by pyrolyzing organic feedstocks under low-oxygen conditions, is a promising tool to restore soil carbon and draw down atmospheric …
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Understanding ocean iron dynamics and impacts on marine ecosystems
… a crucial element in the regulation of the ocean carbon balance and biogeochemical cycles. Atmospheric deposition of dissolved Fe (dFe) to the ocean has increased over the last decades partly due to human activities, which can significantly alter marine ecosystems. Thus, a comprehensive …
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Carbon Accumulation Rates Over the Holocene in Flow Country Peatlands and the Direct Comparison of Open and Afforested Peatland Carbon Stocks Using Tephrochronology
No other terrestrial biome stores carbon as efficiently as peatland. Covering 2-3% of global land surface they are estimated to store as much as half the carbon contained in the atmosphere. With >30% peatland cover, Scotland has more blanket bog than any other country in Western Europe and are …
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Measurements that fill gaps in emission inventories: gas flares, household biomass stoves, and brick kilns
… there were few previous measurements of black carbon (BC) aerosol and poor understanding of the variability in emissions expected. Aircraft facilitated measurements of flares in the Bakken region showed that BC emission factors were 10 times lower than previously predicted and varied over two …
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Soil Respiration of Native Saskatchewan Grassland Calculated from Carbon Dioxide Concentration Profiles
… native grassland soils was 2.5 kg ha-1 hr -1. A carbon balance showed that an average annual carbon fixation of 240 g carbon per m2 compared with an annual CO2-carbon release of 220 g m-2. An equation is derived to predict CO2 evolution from the native grassland soil from soil moisture and soil …
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Evaluating impacts of hydroclimatic extremes on water use efficiency and carbon use efficiency of northern ecosystems
… ecosystems. As essential global water and carbon balance regulators, these sensitive ecosystems respond to increased warming and altered hydrology with modulated resource use efficiencies. This study aimed to investigate the impacts of various hydroclimatic drivers on ecosystem Water Use …
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Tree functional diversity affects litter decomposition and arthropod community composition in a tropical forest
… crucial role of tropical forests in the global carbon balance is determined by tree growth and the rapid turnover of organic material. Land-use change and forest recovery from disturbance alters species- and functional diversity, which in turn can modify decomposition processes and affect …
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Process design and modeling for the production of triacylglycerols (TAGs) in Rhodococcus opacus PD630
… accumulation of TAG is stimulated when a carbon source is present in the medium in excess and the nitrogen source is limiting growth. Under controlled fermentation conditions the organism Rhodococcus opacus PD630 has been shown to grow to high cell density, producing high yields of TAGs …
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Exploring the role of auxin in phenotypic plasticity in Arabidopsis thaliana root development
… from higher latitudes leading to a different carbon balance. Root respiration and root biomass did not change between these populations isolated from different latitudes. Together these results provide insight into the hormonal, environmental, and genetic controls of root developmental …
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In Hot Water: Thermal Acclimation is Insufficient to Save Corals in the Anthropocene
… ocean warming has jeopardized the delicate balance of the very symbioses that have enabled coral survival. Thermal stress causes a reduction of algal symbionts, a phenomenon referred to as ‘coral bleaching’ that represents dysbiosis in the holobiont and often leads to mortality. Current …
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