New Course in Environmental Science
New Course in Environmental Science EVSC 2559
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This 1 page Class Notes was uploaded by Domingo Cruickshank on Monday September 21, 2015. The Class Notes belongs to EVSC 2559 at University of Virginia taught by Thomas Smith in Fall. Since its upload, it has received 41 views. For similar materials see /class/209784/evsc-2559-university-of-virginia in Environmental Science at University of Virginia.
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Date Created: 09/21/15
EVSC 2559 Plants People and Culture Outline with Key Terms and Concepts for Lecture 21 Plants and Ecosystems o Ecosystem o the biotic community and it abiotic environment functioning as a system Net photosynthesis o PhotosynthesisRespiration Carbon allocation Environmental conditions that in uence rates of net photosynthesis light nutrients water temperature Net primary productivity NPP o 10 of NPP is consumed by herbivores In uence of temperature precipitation and nutrient availability on NPP Secondary productivity Decomposition o Litterbag experiments I Process of decomposition is studied by following the decay mass loss of DOM through time In uence of climate on rates of decomposition Decomposition of different carbon compounds 7 lignin In uence of lignin concentration on rates of decomposition Biogeochemical cycle 7 inputs and outputs Nutrient internal cycling plants require nutrients in mineral inorganic form Nutrients are absorbed through the roots and transported to the areas where the plant needs them 0 Retranslocation as leaves senesce a larger portion of the nutrient that they contain are reabsorbed back into the plant Mineralization rate DOM is consumed by decomposers nutrients are transformed from an organic to and inorganic or mineral Immobilization rate if the DOM does not provide sufficient nutrients for the decomposers they will take up mineral nutrients from the soil Net mineralization rate the difference between then rates of mineralization and immobilization This is the rate at which nutrients become available for the uptake by plants 0 Changes in carbon C nitrogen N and the ratio of CN during decomposition 0 During decomposition CN ratios decrease 0 As carbon is consumed and nitrogen is immobilized that amount of carbon relative to nitrogen declines Carbon then begins to be the limiting resource and mineralization begins to dominate over immobilization resulting in a net release of nitrogen to the soil 0 Differences in CN of plant litter and decomposer organisms 7 importance in nitrogen dynamics during decomposition O O O O