通过网格采样法对冬季巢湖西半湖浮游藻类进行科学采集，运用多种方法对浮游藻类的叶绿素含量、个体数量以及群落结构进行了测试、分析与鉴定，补充了巢湖水体中浮游藻类的多样性资料，系统研究了浮游藻类的分布特征。结果表明，浮游藻类叶绿素含量与藻密度呈正相关，两者分布都呈现由河流入湖口和湖中岛屿附近水体向周边降低的变化趋势。浮游藻类群落以蓝藻门为优势门，优势属主要包括微囊藻属、裸藻属、小球藻属、直链藻属和鱼腥藻属。结合多种生物评价方法，如叶绿素含量评价、特征性藻类污染指数评价和藻类群落的多样性指标（Margalef 丰度指数、Shannon Weaver多样性指数、Lloyd Ghelardi均匀度指数和优势度指数）评价，对冬季巢湖西半湖的富营养化和污染状况进行了评估。结果表明，巢湖西半湖水体冬季总体处于中度营养和轻度污染的状态，河流入湖口湖区和湖中岛屿附近水体的富营养化和污染程度较高。%Grid sampling method was employed to collect the planktonic alga from western half of Chaohu Lake in winter .The individuals ,chlorophyll content and community structure of planktonic alga were determined and identified . The results show that positive correlation is observed between chlorophyll contents and alga density .Both chlorophyll contents and alga density decrease gradually from the estuaries to other parts of the lake ,and this tendency is also found in the vicinity of Gushan island ,one of the islands in the lake .The predominant phylum is Cyanophyta ,and the dominant species include Microcystis , Euglena,Chlorella,Melosira and Anabaena.Moreover ,the contamination status and the degree of eutrophication in the lake were evaluated by using various biological assessment methods including chlorophyll content ,index of chlorophyll contents ,index of special planktonic alga ,and diversity indexes (Shannon‐weaver ,evenness ,abundance and dominance) .The results indicate that the western half lake is moderately nutritional and lightly contaminated , and that an elevated degree of eutrophication and contamination is observed in the estuaries of the lake and the vicinity of the island .
展开▼
