Comparative Analysis of Photosynthesis of Three Stipa Species Based on A Photosynthesis Model

作     者：Chan Zhou is with College of Life Science,Liaoning University,Shenyang,110036,China Zhuo Zhang is with College of Biology and Environment Engineering,Shenyang University,Shenyang,110044,China .Yunfei Yang is with Institute of Grassland Science,Northeast Normal University,Key Laboratory for Vegetation Ecology,Ministry of Education,P.R.China,Changchun,130024,China.Qiong Gao is with College of Resources Science and Technology,Beijing Normal University,Key laboratory of Environmental Change and Natural Disasters,Ministry of Education,Beijing,100875,China. 

会议名称：《2011 Chinese Control and Decision Conference（CCDC）》

会议日期：2011年

学科分类：09[农学] 0903[农学-农业资源与环境] 090302[农学-植物营养学] 

基　　金：supported in part by the National Natural Science Foundation of China under Grant 30900117,30770397,30960261 Scientific research Project of Education Department of Liaoning Province under Grant L2010149 The Third Building Project of “Project 211”of Liaoning University--Modern Biological Technology and Exploitation and Using of Northeast Germplasm Resources 

关 键 词：Stipa species photosynthesis characteristics photosynthesis model 

摘      要：We compared photosynthetic characteristics of three Stipa species in NECT,Stipa baicalensis,*** and *** based on ecophysiological traits derived from parameters of a photosynthesis *** net photosynthesis rates,transpiration rate and stomatal conductance,together with microclimate variables of the respective species and sites were observed in July *** photosynthesis rates of three Stipa species were then regressed on incident light intensity,leaf temperature and CO2 partial pressure,and stomatal conductance by means of the nonlinear least square technique and the modified Thornley and Johson’s leaf photosynthesis *** results showed that Thornley and Johson’s photosynthesis model explained on 60.49%,86.17% and 81.36% of variations in observed net photosynthesis rates for three ***,*** and ***,*** difference in photosynthetic characteristics for three Stipa species explained adaptation to conditions of their respective *** photo efficiency of *** is an adaption to lower photosynthetic active radiation （PAR） at high latitude of the meadow steppe *** the other hand,*** in typical steppe and *** in desert steppe sites are located at lower latitude with more available PAR,thus they showed relative lower photon *** conductance of *** is low because of their low leaf nitrogen concentration,which may be caused by the low available soil nitrogen due to low decomposition rates at high *** contrast to ***,*** shows much lower base rate of mitochondria respiration because of higher leaf temperature often experienced by plants at desert steppes.