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 54 for “"net primary production"”.
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Forest Net Primary Production Resistance Across a Gradient of Moderate Disturbance
… the effect of moderate disturbance on forest production and the mechanisms sustaining or supporting the recovery of the C cycle across a range of moderate disturbance severities. We used a broad plot-scale gradient of upper canopy tree mortality within a large manipulation of forest …
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Future potential net primary production trends of contiguous United States rangelands
… to affect many of the factors that influence the production of rangeland vegetation. Understanding future trends and patterns in net primary production (NPP) requires projected potential NPP to better understand how rangelands will be affected by a changing climate. Here, I used climate data …
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Future potential net primary production trends of contiguous United States rangelands
… to affect many of the factors that influence the production of rangeland vegetation. Understanding future trends and patterns in net primary production (NPP) requires projected potential NPP to better understand how rangelands will be affected by a changing climate. Here, I used climate data …
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Ecosystem Net Primary Production Responses to Changes in Precipitation Using an Annual Integrated MODIS EVI
In this study, the relationship of above-ground net primary productivity (ANPP) with precipitation using the enhanced vegetation index (EVI) from satellite data as surrogate for ANPP was assessed. To use EVI as a proxy for ANPP we extracted the satellite data from areas with uniform vegetation in a …
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Analysis of Net Primary Production Models and Observations in the Tropical Pacific Ocean and Their Relationship with Fisheries Yield
<p>Primary production regulates fisheries yield, but testing the degree to which it is so is complicated by our limited ability to measure and model net primary production in the ocean. Herein, I analyze primary production and fisheries yields in the tropical Pacific Ocean, and how uncertainties in …
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Distributional models of ocean carbon export
… flux and other key variables – temperature, net primary production, and depth. Particular use is made of (probability) distributional descriptions of quantities that are known to vary appreciably. First, using established thermodynamic dependencies for primary production and respiration, a …
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Climate change and plant species composition and community structure in the Central Grassland Region of North America
… to influence soil water balance, which is a primary determinant of terrestrial vegetation. Aspects of soil water balance have been shown to affect many properties of plant communities. The distribution of the earth's major biomes, for example, can be largely predicted from temperature and …
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Model-based analysis of climate change impacts on the productivity of oak-pine forests in Brandenburg
… forest productivity, I calculated the change in net primary production on the base of a large set of climate scenarios for different tree species and the total area of Germany. Temperature increases up to 3 K lead to positive effects on the net primary production of all selected tree species. …
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The Role of Floods in Particulate Organic Matter Dynamics of a Southern Appalachian River/Floodplain Ecosystem
… floodplain litter, and aboveground herbaceous net primary production at 12 sites. Annual litter inputs (274-625 g m-2 y-1) were typical of a temperate deciduous forest, but lower than other floodplain forests in the eastern United States. Mean aboveground herbaceous net primary production …
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Trophic dynamics in the fine-root based food web: integrating resource heterogeneity, root herbivores, and root foraging
… they influence ecosystem-scale factors such as net primary production is unclear. In addition, little is known regarding root herbivore foraging behaviors and, more importantly, whether these foraging behaviors can actually influence species interactions. In this dissertation, I present a …
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Distributional models of ocean carbon export
… flux and other key variables - temperature, net primary production, and depth. Particular use is made of (probability) distributional descriptions of quantities that are known to vary appreciably. First, using established thermodynamic dependencies for primary production and respiration, a …
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Effects of drought on the growth of young and mature temperate forests in West Virginia
… was to determine the variation in aboveground production between two different aged forest stands and to evaluate the effect of drought on inter-annual variation in productivity. Aboveground net primary production (ANPP) was compared with precipitation and the Palmer Drought Severity Index to …
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Understanding Forest Landscape Response to Global Climatic Change: An Uncertainty Evaluation Based on Spatial Modeling
… at different levels, including physiology (e.g. net primary production) and seedling establishment response at the species level, the colonization and competition response at the forest succession level, and the species composition response at the community level. For this purpose, a forest …
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The Effect of Elevated Carbon Dioxide and Ozone on Soybean Development, Leaf Anatomy and Productivity
… increase in canopy photosynthesis or gross primary production (GPP). A draw-back of FACE is that GPP cannot be measured directly. Measurements of micrometeorology, leaf photosynthetic properties and canopy structure were combined in an adapted version of the Integrated Scientific Assessment …
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The timing of growing season drought and its effects on above- and belowground production in a mesic grassland
… the response of both above- and belowground net primary production (ANPP & BNPP) to reductions in precipitation in a mesic, tallgrass prairie in NE Kansas. Experimental plots were subjected to one of three drought treatments (25% reductions in the average growing season precipitation [GSP]) …
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Vegetation survey of Namibia: conceptualisation and implementation of a nation-wide vegetation survey serving practical land management needs
… services derived from ecosystems encompass food production {crop growing or provision of pastures for livestock and game), the provisioning of raw materials, including a profusion of materials and processes, such as building materials, fuel, water, shelter, erosion control and sediment retention, …
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Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa
Procedures for measuring phytoplankton production in the southern Benguela upwelling region were investigated. A 125 ml incubation bottle is recommended for routine primary production measurements. Exposure of production samples to high light intensities during manipulations on deck was found to …
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Quantifying Crop Yield, Bioenergy Production And Greenhouse Gas Emissions From Cropland And Marginal Land Using A Model-Data Fusion Approach
… dedicated to quantifying and evaluating biofuel production and potential climate change mitigation due to potential large-scale bioenergy expansion in the conterminous United States, using model-data fusion approaches.</p> <p>Biofuel made from conventional (e.g., maize (<em>Zea mays</em> L.)) and …
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A modeling study of the marine biogeochemistry, plankton dynamics, and carbon cycle on the continental shelf off the West Antarctic Peninsula
… the model, and values of vertically integrated net primary production (NPP) are largely consistent with observations. Although a bias towards lower surface dissolved inorganic carbon (DIC) and alkalinity was identified in the model results, interannual variability was similar to the observed in …
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A modeling study of the marine biogeochemistry, plankton dynamics, and carbon cycle on the continental shelf off the West Antarctic Peninsula
… the model, and values of vertically integrated net primary production (NPP) are largely consistent with observations. Although a bias towards lower surface dissolved inorganic carbon (DIC) and alkalinity was identified in the model results, interannual variability was similar to the observed in …
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