杭州西溪湿地首期工程区浮游植物群落结构及与水质关系

2007年1-12月,调查了西溪湿地(Ⅰ-Ⅳ站)浮游植物的属类组成、密度和生物多样性指数,并将水质理化参数与藻类的群落指标进行相关性分析.4个采样站中共发现8门56个属藻类,其中绿藻门和硅藻门占73.21%.Ⅰ-Ⅳ站藻类年均密度分别为2.88×10~8、0.37×10~8、0.47×10~8和0.71×10~8cells/L,其中绿藻门和隐藻门占总浮游植物密度的93.76%,优势属为小球藻属(Chlorella)、隐藻属(Cryptomonas)和衣藻属(Chamydomonas).Ⅰ-Ⅳ站藻类Margle属多样性指数分别为1.17、1.10、1.08和1.06.根据藻类各项指标值,西溪湿地已遭受污染,水体为富营养型.相关分析结果表明:Ⅰ站和Ⅲ站的浮游植物密度对数与COD_Mn指数呈极显著的正相关关系(P<0.01),Ⅰ-Ⅳ站浮游植物密度对数与水质电导率之间均有显著或极显著的正相关关系.

Community structure of phytoplankon and its relation with water quality in Xixi Wetland for the frist project aera, Hangzhou

Studies on community structures of phytoplankon, including genus richness, density and biodiversities, and regression analysis between community index of phytoplankon and water quality parameters were carried out from Jan. to Dec. of 2007 in Xixi Wetland of the first project-circled aera, Hangzhon. 56 genus of algae were found, of which 73.21% were Chlorophyta and Bacillariophyta. The annual mean density of algae from Ⅰ station to Ⅳ station were 2.88×10~8, 0.37×10~8, 0.47×10~8 and 0.71×10~8 cells/L respectively, of which 93.76% were Chlorophyta and Cryptophyta, and the Chlorella, Cryptomonas and Chamydomonas were dominated in the algae community. The algae diversity indexes of Genus Marglef from Ⅰ station to Ⅳ station were 1.17, 1.10, 1.08 and 1.06 respectively. According to values of algae comprehensive index, Xixi Wetland has suffered serious pollution and can be regarded as eutrophication status. Logarithm density of algae was positively correlated with COD_(Mn) value in station Ⅰ and station Ⅲ (P< 0.01), and positively correlated with water conductivity value from Ⅰ station to Ⅳ station(P< 0.01).