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EXPERIMENTS ON AQUATIC ECOSYSTEM REGIME SHIFT IN ENCLOSURES NEAR LAKE DIANCHI, CHINA.

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Title: EXPERIMENTS ON AQUATIC ECOSYSTEM REGIME SHIFT IN ENCLOSURES NEAR LAKE DIANCHI, CHINA.
Authors: Yingcai Wang1,2, Zhen Wan1,2, Fengyi Chang1,2, Yanhui Li1,2, Yanping Su1,2, Lanlan Lu1,2, Yinwu Shen1, Genbao Li1, Dunhai Li1, Yongding Liu1 liuyd@ihb.ac.cn
Source: Fresenius Environmental Bulletin. 2009, Vol. 18 Issue 3, p294-303. 10p. 1 Graph.
Subject Terms: *Biotic communities, *Aquatic ecology, *Environmental remediation, *Environmental engineering, *Population biology, *Lakes
Geographic Terms: China
Abstract: To discover how a lake converts from a turbid state to clean state, and what drives this process, we constructed controlled enclosure ecosystems and used the ecological remediation method to force ecosystems to convert from the turbid state to the clean state. Our results show that the driving forces include temperature, macrophyte, silver carp and mussel, which form a combined force to drive the con- trolled ecosystem to switch. There is a threshold existing in treated enclosure ecosystem during the conversion from turbid to clean state. When TP <0.09 mg.L-1, Chl-a <0.036 mg.L-1, transparency >62 cm, TN <2.15 mg.L-1, CODMn <13.7 mg.L-1, tubidity <10, and the number of algal cells <106 cells.L-1, the treated ecosystem changes sharply from turbid to clean state. The conversion process can be divided into three phases: turbid state, clean-turbid transitional state as well as clean state, and described with the power function Y = a*Xb (where Y is water parameter, X is time, a and b are constants), which indicates that the shift in the enclosure ecosystem from turbid to clean state is discontinuous. [ABSTRACT FROM AUTHOR]
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Abstract:To discover how a lake converts from a turbid state to clean state, and what drives this process, we constructed controlled enclosure ecosystems and used the ecological remediation method to force ecosystems to convert from the turbid state to the clean state. Our results show that the driving forces include temperature, macrophyte, silver carp and mussel, which form a combined force to drive the con- trolled ecosystem to switch. There is a threshold existing in treated enclosure ecosystem during the conversion from turbid to clean state. When TP <0.09 mg.L-1, Chl-a <0.036 mg.L-1, transparency >62 cm, TN <2.15 mg.L-1, CODMn <13.7 mg.L-1, tubidity <10, and the number of algal cells <106 cells.L-1, the treated ecosystem changes sharply from turbid to clean state. The conversion process can be divided into three phases: turbid state, clean-turbid transitional state as well as clean state, and described with the power function Y = a*Xb (where Y is water parameter, X is time, a and b are constants), which indicates that the shift in the enclosure ecosystem from turbid to clean state is discontinuous. [ABSTRACT FROM AUTHOR]
ISSN:10184619