Chinese Journal of Applied Ecology
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XIE Tao;YANG Zhi-feng
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Abstract: A pot experiment was conducted to study the effects of soil water cont ent on the net photosynthetic rate (Pn), transpiration rate (Tr), st omatal conductance (Gs), intercellular CO2 concentration (Ci), wat er use efficiency (WUE), and light use efficiency (LUE) of fresh water s wamp Phragmites australis from estuarine wetland of Yellow River Delta, with the appropriate soil water condition approached. The results showed that the P n, LUE, Tr , and WUE of fresh water swamp P. australis had o bvious response thresholds on the alteration of soil water content. Waterlogged status was not the optimal water condition for fresh water swamp P. australis . To maintain the normal growth of fresh water swamp P. australis during i ts fast growth period, soil volumetric water content (Wv ) should be above 257% (i.e., relative water content Wr>666%), opt imal Wv should be 369% (i.e., Wr=956%), and the most deficie nt degree of Wv should be about 215% (i.e., Wr=557%). Stomat al limitation was the main tolerance mechanism of fresh water swamp P. austral is under water deficit. Under drought condition, the maximum net photosyntheti c rate (Pn max) and apparen t quantum yield (AQY) of fresh water swamp P. australis declined obvious ly. In the meanwhile, fresh water swamp P. australis could reduce its dark r espiration (Rd) to decrease the consumption of photosynthetic products, an d improve its water use efficiency (WUE) to keep high photosynthetic rate.
Key words: sand-fixing plant, configuration mode, plant community characteristics, water relation, gas exchange.
XIE Tao;YANG Zhi-feng. Effects of water stress on photosynthetic parameters of Phragmites australis in estuarine wetland of Yellow River Delta.[J]. Chinese Journal of Applied Ecology.
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URL: https://www.cjae.net/EN/abstract/abstract2216.shtml
https://www.cjae.net/EN/Y2009/V20/I03/562