云南高原湖滨带3种挺水植物对水体N的净化能力及响应

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Abstract

Three emergent aquatic plants including Scirpus validus,Phragmites australis and Zizania latifolia,commonly found in Yunnan plateau wetland lakeside were selected to study the purification effect using pot experiments.The biomass,resistance,nitrogen(N) removal and their relationships of the plants were studied under the TN concentrations of 10 15 mg.L 1in the sewage.The results showed that the N removal ability had significant correlation with the plant physiological reaction and growth.The relative growth rates of S.validus,Z.latifolia and P.australis were 0.0023,0.0012 and 0.0017 d 1,respectively.Growth rate in height of S.validus was 1.4 times and 1.84 times higher than that of Z.latifolia and P.australis,respectively.The biomass of S.validus reached 3.53 g,which was 1.76 times and 2.22 times higher than that of P.australis and Z.latifolia,respectively.The N accumulation capacity of S.validus was 1.1 times and 1.3 times larger than that of P.australis and Z.latifolia,respectively,and it also had significantly higher N assimilation efficiency as compared to Z.latifolia and P.australis.For S.validus,P.australis and Z.latifolia,the sewage N removal rates were 86.59%,76.32% and 74.83%;the rates of N uptake were 23.81%,8.55% and 11.30%;the conductivities were 1.136,2.214 and 1.413;and the ratios of MDA were 0.962,1.629 and 2.06.S.validus appeared to be most efficient in both of purification and stress resistance.The result showed that the functioning of plants and their adaptation to environment not only depend on their biological characteristics but also on the growth environment.To apply the aquatic plants to treat the polluted lakes,the compatibility of plant biological characteristics and plant adaptability should be considered;otherwise,the goal of purifying polluted lake waters could not be reached.

Key words： emergent aquatic plants lakeside nitrogen(N) environmental stress purification

Received: 25 April 2012

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	Articles by authors
	YUE Hai-tao
	TIAN Kun
	ZHANG Kun
	HUANG Yu-chun

Cite this article:

YUE Hai-tao,TIAN Kun,ZHANG Kun, et al. Nitrogen removal ability of three emergent aquatic plants along the plateau lakeside of Yunnan and their response to sewage[J]. , 2012, 31(2): 133-137.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2012/V31/I2/133

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