铜锈环棱螺对藻华水体理化指标的影响

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Abstract

The effect of different densities(392 ind·m^-2,196 ind·m^-2,98 ind·m^-2 and 0 ind·m^-2) of Bellamya aeruginosa on the physical and chemical properties of algal bloom water by setting up experimental enclosures in pond were studied.The experiment was carried out from September 14,2009,and lasted for two months.The results showed that in the middle and late stages,water transparency in low,medium and high density groups was above 60 cm,but that in the control group showed no significant change and fluctuated from 29 cm to 40.3 cm.It indicates that B.aeruginosa can increase the secchi depth(SD) of water.Dissolved oxygen(DO) in the treated groups was significantly lower than that in the control group,suggesting that snails would reduce the DO of water.In addition,our results showed that snails reduced the total Chl-a,but not the concentration of nutrients in the water.The downward trend of TN and PO₄^3--P concentrations showed negative correlation(R=-0.9851,p<0.05,and R=-0.9678,p<0.05) with the snail density.The data(SD,DO,pH,Chl-a,NH₄⁺-N,NO₃^--N and PO₄^3--P) were analyzed by the Duncan multiple comparison and cluster analysis methods,and showed that there were significant differences between the control group and treatment group at p<0.05 level.Therefore it is suggested that snails can to some extent improve the water quality.

Key words： algal bloom water Bellamya aeruginosa enclosure experiment multiple comparison cluster analysis

Received: 25 October 2010

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	LIU Xia-song
	ZHANG Ke-xin
	Lü Jin
	XIE Li-feng
	LU Kai-hong

Cite this article:

LIU Xia-song,ZHANG Ke-xin,Lü Jin, et al. The effect of Bellamya aeruginosa on the physical and chemical properties of the algal bloom water[J]. , 2010, 29(5): 438-443.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2010/V29/I5/438

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