Photosynthetic Characteristics and Water Use Efficiency of Three Species of Desalination Plant Irrigated by Saline Water
With saline water irrigation, we comparatively analyzed main photosynthetic parameters and water efficiency of three desalination plants, Populus euphratica , Tanmrix spp. And Atriplex canescens by u-sing Li-6400 portable photosynthesis system. The results were as follows. (l)In the light intensity 0 - 2 000 μmol · m-2 · s-1 , the net photosynthetic rate (Pn) and stomata conductance (Gs) of Tanmrix spp. Were always in the highest level among 3 species, the next was P. euphratica. (2)When light intensity was in 400 - 2 000 μmol · m-2 · s-1 , the quantity order of transpiration rate(Tr) and intercellular CO2 concentration (C|)was Tanmrix spp. > P. euphratica > A. canescens. But the quantity order of water use effi-ciency(WUE) was A. canescens > Tanmrix spp. > P. euphratica; (3) When light intensity was in 0 - 400 μmol · m-2 · s-1 , P. euphratica had the largest Tr and WUE, the next was Tanmrix spp. On the contrary, C, of A. canescens was significantly higher than that of Tanmrix spp. And P. euphratica respectively. In summary, Atriplex canescens had higher water use efficiency and lower transpiration rate among 3 species of desalination plants, so it was water-saving and anti-drough plant relatively; P. euphratica and Tanmrix spp. Had lower water use efficiency and higher transpiration rate, thus they were water consump-tion plants. Three tested plants all could adapt the environments with higher temperature, higher illumination and drought, indicating to some extent, the 3 species were adaptable to the stressed environment.
desalination plantphotosynthetic characteristicswater use efficiency
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