Abstract:The gas exchange characteristics of leaves of the aquatic, arenaceous and halophilous Phragmites communis Trln. Growing in dry desert region of the Hexi Corridor, Gansu province, were studied under natural conditions by using a protable Li-6000 gas analysis system. Daily time courses of gas exchange, air ternperature(Tα), photon flux density (PFD) and air relative humudity(RH) were monitored in hot, sunny days. Significant differences in gas exchange characteristics were found between the three differente e...