title: Seasonal fluctuations and temperature dependence in photosynthetic parameters and stomatal conductance at the leaf scale of Populus euphratica Oliv.
abstract: A combined model to simulate CO₂ and H₂O gas exchange at the leaf scale was parameterized using data obtained from in situ leaf-scale observations of diurnal and seasonal changes in CO₂ and H₂O gas exchange. The Farquhar et al.-type model of photosynthesis was parameterized by using the Bayesian approach and the Ball et al.-type stomatal conductance model was optimized using the linear least-squares procedure. The results show that the seasonal physiological changes in photosynthetic parameters (e.g., V(cmax25), J(max25), R(d25) and g(m25)) in the biochemical model of photosynthesis and m in the stomatal conductance model should be counted in estimating long-term CO₂ and H₂O gas exchange. Overall, the coupled model successfully reproduced the observed response in net assimilation and transpiration rates.
authors.affiliation: Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou, China.
authors.forename: Gao-Feng
authors.initials: GF
authors.lastname: Zhu
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Yong-Hong
authors.initials: YH
authors.lastname: Su
authors.forename: Ling
authors.initials: L
authors.lastname: Lu
authors.forename: Chun-Lin
authors.initials: CL
authors.lastname: Huang
mesh_terms: D001499:Bayes Theorem; D001692:Biological Transport; D002681:China; D008954:Models, Biological; D010788:Photosynthesis; D018515:Plant Leaves / Q000378:metabolism; D054046:Plant Stomata / Q000378:metabolism*; D032107:Populus / Q000378:metabolism*; D012621:Seasons; D013696:Temperature