Modeling Carbon Exchange in Different Forest Ecosystems by CEVSA Model: Comparison with Eddy Covariance Measurements
Received date: 2006-10-16
Revised date: 2007-01-29
Online published: 2007-03-10
The model of Carbon Exchange in the Vegetation-Soil-Atmosphere (CEVSA) is an ecosystem mechanical model to simulate energy transfers and water, carbon and nitrogen cycles based on ecophysiological processes. It has been widely used at the scales of regional and global; however, the description of water and carbon fluxes have not yet been evaluated and validated at ecosystem scale. The revised CEVSA model incorporates several significant improvements over the previous version of CEVSA. Using data from eddy covariance measurements in three different forest ecosystems, which represent the temperate mixed forest, temperate deciduous forest and sub-tropical coniferous forest, respectively, we tested and evaluated the previous and revised CEVSA model. The revised and previous model both can simulate the seasonal variation of carbon exchange in different forest ecosystem, and the revised model simulated much better the temporal variation and magnitude of carbon exchange than the previous model did. However, systematic errors in flux simulation were also identified for particular time of season in different ecosystems. The present study shows that the revised CEVSA model can simulate the seasonal pattern and magnitude of CO2 fluxes, but further improvement in calibrating the model simulation, especially in the responses and adaptability of photosynthesis and respiration to environment change, is required.
Key words： Ecosystem model; Forest ecosystems; Carbon exchange; Eddy covariance.
GU Feng-xue, [CAO Ming-kui], YU Gui-rui, TAO Bo, WEN Xue-fa, LIU Yun-fen,et al . Modeling Carbon Exchange in Different Forest Ecosystems by CEVSA Model: Comparison with Eddy Covariance Measurements[J]. Advances in Earth Science, 2007 , 22(3) : 313 -321 . DOI: 10.11867/j.issn.1001-8166.2007.03.0313
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