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www.hydrol-earth-syst-sci-discuss.net/6/6503/2009/
doi:10.5194/hessd-6-6503-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
Parameterization of the coupling CO2 and H2O gas exchange model at the leaf scale of Populus euphratica tree
1Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
2The School of Mathematics, Physics & Software Engineering, Lanzhou Jiaotong University, Lanzhou, 730000, China
Abstract. 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 1ยท5-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. Prediction of net photosynthesis by the coupled model agreed well with the validation data, but the model tended to underestimate rates of transpiration. Overall, the combined model generally captured the diurnal patterns of CO2and H2O exchange resulting from variation in temperature and irradiation.
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Citation: Zhu, G., Li, X., Su, Y., and Huang, C.: Parameterization of the coupling CO2 and H2O gas exchange model at the leaf scale of Populus euphratica tree, Hydrol. Earth Syst. Sci. Discuss., 6, 6503-6534, doi:10.5194/hessd-6-6503-2009, 2009. Bibtex EndNote Reference Manager XML
