Global ETD Search
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Showing 1 to 7 of 7 for “"net ecosystem production"”.
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Uncertainty quantification and calibration of physical models
<p>An ecosystem model is a representation of a real complex ecological system, and is usually described by sophisticated mathematical models. Terrestrial Ecosystem Model (TEM) is one of the ecosystem models, that describes the dynamics of car- bon, nitrogen, water and other vegetation related …
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Simulating the Impacts of Land-Use Land-Cover Changes on Cropland Carbon Fluxes in the Midwest of the United States
… (LULC) changes, such as changes in cropland production technologies, tillage practices, and planted crop species, could have large impacts on carbon fluxes. However, the impacts remain highly uncertain at regional to global scales. Satellite remote sensing is commonly used to create products …
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The Flow Regime of Function: Influence of flow changes on biogeochemical processes in streams
Streams are ecosystems organized by disturbance. One of the most frequent disturbances within a stream is elevated flow. Elevated flow can both stimulate ecosystem processes and impede them. Consequently, flow plays a critical role in shifting the dominant stream function between biological …
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Partitioning soil respiration in response to drought and fertilization in loblolly pine: laboratory and field approaches
An understanding of ecosystem-level carbon (C) sequestration, or net ecosystem production (NEP), requires the separation of heterotrophic, microbial respiration (RH) from autotrophic, root-derived respiration (RA) as the components of RS (i.e., NEP = NPP - RH). However, separating these two sources …
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Effects of experimentally-altered hydrology on ecosystem function in headwater streams
Forested headwater stream ecosystems are important integrators of terrestrial and aquatic systems and their function depends greatly on water availability. In the southern Appalachians, models of future climate change predict alterations to the timing and intensity of storms such that most …
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Modeling the combined environmental effects on net land carbon flux in the present and future scenarios
Anthropogenic activities such as fossil fuel production and Land Use and Land Use Changes (LULCC) have been contributing to the sources for the atmospheric carbon dioxide (CO2) in the global carbon cycle. The terrestrial ecosystem globally absorbs about 30% of the anthropogenic CO2 emissions as a …
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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)
… extents of biases in terrestrial gross primary production (GPP) due to the use of meteorological reanalysis datasets. I first calibrated the model using meteorology and eddy covariance data from 25 flux tower sites ranging from the tropics to the northern high-latitudes, and thereafter repeated …