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首页> 美国政府科技报告 >Nitrogen Interactions and Photosynthetic Responses to CO2: Work Plan for Biocon211 Experiment/Physiological Measurements at Cedar Creek
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Nitrogen Interactions and Photosynthetic Responses to CO2: Work Plan for Biocon211 Experiment/Physiological Measurements at Cedar Creek

机译：氮的相互作用和对CO2的光合响应：Cedar Creek的Biocon211实验/生理测量工作计划

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摘要

Nitrogen plays a critical role in photosynthetic function, which in turn can211u001eaffect many ecosystem processes through its effects on plant growth and ecosystem 211u001ecarbon cycles. As a result of its central role in photosynthetic enzymes, leaf N 211u001estatus can affect the magnitude of photosynthetic enhancement by elevated CO(sub 211u001e2). It is now well-recognized that species responses to elevated CO(sub 2) may be 211u001edifferent when species are grown in isolation vs. in a mixed community. Part of 211u001ethis effect may result from effects on leaf N itself as a result of species 211u001ecompetition for N in N-limited ecosystems, and part of the effect is simply a 211u001efunction of dilution of leaf nutrients in leaves with greater carbohydrates as a 211u001eresult of elevated CO(sub 2). However, photosynthetic efficiency itself may be 211u001eaffected if N-limited plants reallocate N within leaves away from carboxylation 211u001efunctions under elevated CO(sub 2) compared to ambient plants (Drake et al. 211u001e1997). Thus while there is cause to believe that there are interactive effects of 211u001eN and CO(sub 2) on species photosynthetic physiology, there is little 211u001eexperimental data to support or reject this idea, particularity in realistic 211u001eecosystems under field conditions.

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