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	Photosynthesis-transpiration coupling model at canopy scale in terrestrial ecosystem
	Ren C. Y. ; Yu G. R. ; Wang Q. F. ; Guan D. X.
	2005
关键词	photosynthesis rate transpiration rate SMPT-SB model internal conductance canopy scale stomatal conductance water-use co2 behavior carbon plants field parameterization assimilation temperature
英文摘要	At the hypothesis of big leaf, an ecosystem photosynthesis-transpiration coupling cycle model was established by the scaled SMPT-SB model from single leaf to canopy, and model parameterization methods were discussed. Through simulating the canopy light distribution, canopy internal conductance to CO2 can be scaled from single leaf to canopy by integrating to canopy using the relationship between single internal conductance and photosynthetic photon flux density. Using the data observed by eddy covariance method from the Changbai Mountains site of ChinaFLUX, the application of the model at the canopy scale was examined. Under no water stress, the simulated net ecosystem photosynthesis rate fitted with the observed data very well, the slope and R-2 of the line regression equation of the observed and simulated values were 0.7977 and 0.8892, respectively (n = 752), and average absolute error was 3.78 mu mol CO2 m(-2) s(-1); the slope, R-2 and average absolute error of transpiration rate were 0.7314, 0.4355 and 1.60 mmol H2O m(-2) s(-1), respectively (n = 752). The relationship between canopy photosynthesis, transpiration and external environmental conditions was discussed by treating the canopy as a whole and neglecting the comprehensive feedback mechanism within canopy, and it was noted that the precipitation course affected the transpiration rate simulation badly. Compared to the models based on eco-physiological processes, the SMPT-SB model was simple and easy to be used. And it can be used as a basic carbon and water coupling model of soil-plant-atmosphere continuum.
出处	Science in China Series D-Earth Sciences
卷	48
页	160-171
收录类别	SCI
语种	英语
ISSN号	1006-9313
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23153]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Ren C. Y.,Yu G. R.,Wang Q. F.,et al. Photosynthesis-transpiration coupling model at canopy scale in terrestrial ecosystem. 2005.

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