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《Chinese Journal of Ecology》 2017-04
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Seasonal variation in photosynthetic parameters of Artemisia ordosica in relation to leaf nitrogen and specific leaf area

WANG Zi-qi;ZHA Tian-shan;JIA Xin;WU Ya-juan;ZHANG Ming-yan;MU Jia-wei;School of Soil and Water Conservation,Yanchi Research Station,Beijing Forestry University;  
Understanding the seasonal dynamics of photosynthetic capacity of plants and its relationship with leaf traits is of great significance for accurate simulation of ecosystem carbon cycle.In this study,we measured in situ photosynthetic light and CO_2 response curves of Artemisia ordosica over an entire growing season in the Mu Us Desert,and analyzed the relationship of leaf nitrogen content(N_(mass)),specific leaf area(SLA) with the photosynthetic parameters of A. ordosica. As a result,the maximum net photosynthetic rate(P_(nmax)),apparent quantum yield(α),maximum carboxylation rate(V_(cmax)),maximum electron transportation rate(J_(max)) were relatively higher in the late spring and early autumn in the growing season,largely fluctuated in summer.P_(nmax),α,V_(cmax)and J_(max)ranged as 13. 79-33. 31 μmol CO_2·m~(-2)·s~(-1),0.020-0.053 mol·mol-1,27.25-89.10 μmol·m~(-2)·s~(-1)and 24.19-62.18 μmol CO_2·m~(-2)·s~(-1),and averaged at23.77 μmol CO_2·m~(-2)·s~(-1),0.037 mol·mol-1,56.29 μmol·m~(-2)·s~(-1)and 42.44 μmol CO_2·m~(-2)·s~(-1)respectively. The light compensation point(LCP) and CO_2 compensation point(Co)did not change significantly over the growing season. Correlation analysis showed that photosynthetic parameters P_(nmax),V_(cmax)and J_(max)were positively correlated with N_(mass)and SLA. The results further confirmed that the N_(mass)and SLA were important factors affecting the photosynthetic capacity of A. ordosica. The relationship between photosynthetic parameters and leaf traits obtained in this study can be used to help build parametric models of ecosystem processes.
【Fund】: 国家自然科学基金项目(31270755、31670708和31670710);; 中央高校基本科研业务费专项(2015ZCQ-SB-02)资助
【CateGory Index】: Q945
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