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Studies on the changes of West Lake＇s zoobenthic communites after Qiantang River water was pumped into it

Journal of Zhejiang University Science 2002年第1期3卷 118-124页

作者：虞左明严力蛟吴洁 InstituteofEnvironmentalScience Hangzhou310005China AgroecologyInstitute ZhefiangUniversityHangzhou310029China HanzhouEnvironmentalMonitoringCenter Hanzhou310007China

During Jan.1995 to Dec.1996, monthly investigations on the zoobenthic communities of West Lake, samples were collected from six sampling stations. A total of 26 species of macrozoobenthos were identified. The seasonal changes in density and biomass of zoobenthos in this lake were analyzed. The annual mean densities were 980～2751 ind/m\+2 and mean biomass was 19.69-122.80 g/m\+2. The densities in winter and early spring were higher than those in summer and autumn. Comparative study of theprevious data (1982 to 1983) collected by the authors, showed that the succession of zoobenthic communities, dominated by \%Procludius choreus\% in density and \%Bellamya purificata\% in biomass, had been occurred in Xiaonan sub\|lake after Qiantang River water was drawn into it; and that the species and biomass of zoobenthos were then increased and the density was decreased. In other sub\|lakes, the dominant species were \%Limnodrilus hoffmeisteri\% and \%Tokunagayusurika akamusi \%in density and \%Branchiura sowerbyi\% and \%Tokunagayusurika akamusi \%in biomass. The water quality was bad in these sub\|lakes because these dominant species are indicators of eutrophication. According to the Margalef index and Goodnight index, West Lake is still an eutrophic lake. Only the water quality of Xiaonan sub\|lake was improved after water drawn from the Qiantang River was introduced into it.

关键词： zoobenthos eutrophication water pumped West Lake environmental engineering

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Studies on the changes of West Lake's zoobenthic communites after Qiantang River water was pumped into it

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2002年第1期3卷 119-125页

作者：虞左明严力蛟吴洁 Institute of Environmental Science Hangzhou China Agroecology Institute Zhejiang University Hangzhou China Hangzhou Environmental Monitoring Center Hangzhou China

关键词： zoobenthos eutrophication water pumped West Lake environmental engineering

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