Seasonal Variation and Correlation with Environmental Factors of Photosynthesis and Water Use Efficiency of Juglans regia and Ziziphus jujuba. - Yang, Hai‐Bo; An, Shu‐Qing; Sun, Osbert‐Jianxin; Shi, Zuo‐Min; She, Xin‐Song; Sun, Qing‐Ye; Liu, Shi‐Rong (Journal of Integrative Plant Biology, 2008)