Photosynthetic characteristics of a typical desert plant Nitraria tangutorum under four rain addition treatments (+25%, 50%, 75% and 100% of local mean annual precipitation) were measured with Li-6400xt Portable Photosynthesis Analyzer at the eastern edge of the Ulanbuh Desert. Discussed the response process and mechanism of photosynthetic characteristics to rainfall. The main results are as follows:
(1)Net photosynthetic rate (Pn), transpiration rate (Tr), the maximum net photosynthetic rate(Amax), app...