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《Oceanologia Et Limnologia Sinica》 1993-04
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COMPREHENSIVE EVALUATION OF EUTROPHICATION IN DONGHU, LAKE WUHAN

Cai Qinghua(Institute of Hydrobiolcgy, Academia Sinica, Wuhan 430072)  
Evaluation of the eutrophication in a (or trophic state of) lake is a multivariate comprehensive decision-making process quantifying the qualitative probltm. Besides establishment of a rational evoluation index system for the trophic state of a lake, a key problem in this process is to determine the weight attributions of the observed indices. Wing indices commonly used to the monitor aquatic ecosystem, this work included seven nutrient (nitrate-N, nitrite-N, ammonium-N, total-N, phosphate-P, total-P and silicates) and three phytoplanktonic (mean gross primary productivity, biomass and chorolophyll a) parameters in the index system. By using hierarchial analysis, the weight contributions of the ten parameters to eutrophication were determined in % as 2.9, 0.7, 1.7, 8.3, 5.3, 13.2, 1.3 and 16.6, 10.5, 39.6 respectively for nitrate-N, nitrite-N, ammonium-N, total-N, phosphate-P, total-P, silicates and mean gross primary productivity, bio-mass, chorolophyll a (consistency ratio CR = 0.060.10). This work established new method for evaluating lake eutrophication was established. The application of this evaluation system to Donghu, Lake Wuhan, demonstrated that the eutrophication in this lake was quite serious. Data from 1980 to 1984 at the two sampling stations in the lake showed that this lake was changing from an eutrophic to a hypereutrophic one. It is pointed out that the trophic state of Donghu Lake did not undergo significant changes in recent years, although values of several parameters, especially phytoplanktonic indices, obviously declined. The ecological application of the analytic hierarchy process is discussed in this paper.
【Fund】: 国家自然科学基金
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