Hydrology and Earth System Sciences Discussions www.hydrol-earth-syst-sci-discuss.net 1812-2108 1812-2116 6 5 2009 10.5194/hessd-6-6503-2009 http://www.hydrol-earth-syst-sci-discuss.net/6/6503/2009/ http://www.hydrol-earth-syst-sci-discuss.net/6/6503/2009/hessd-6-6503-2009.html http://www.hydrol-earth-syst-sci-discuss.net/6/6503/2009/hessd-6-6503-2009.pdf 6503 6534 2009-10-26 Parameterization of the coupling CO2 and H2O gas exchange model at the leaf scale of Populus euphratica tree G. Zhu syh@lzb.ac.cn X. Li Y. Su C. Huang Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China The School of Mathematics, Physics & Software Engineering, Lanzhou Jiaotong University, Lanzhou, 730000, China The following two models were combined to predict simultaneously CO2 and H2O gas exchange at the leaf scale of Populus euphratica: a Farquhar et al. type biochemical sub-model of photosynthesis (Farquhar et al., 1980) and a Ball et al. type stomatal conductance sub-model (Ball et al., 1987). The photosynthesis parameters, Vcmax, Jmax, TPU, and Rd (maximum carboxylation rate allowed by ribulose 1·5-bisphosphate carboxylase/oxygenase (Rubisco), rate of phosynthetic electron transport, triose phosphate use, and day respiration) at the measurement temperature were determined by using the genetic algorithm (GA) method based on A/Ci data sets. The stomatal conductance sub-model was calibrated independently. 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