蓝藻爆发后南太湖水域浮游生物及富营养化

State of Plankton and Eutrophication after Outbreak of Cyanophyta Bloom-forming in South of Taihu Lake

在对南太湖近岸水域生态环境调查的基础上,分析了2007年5月底太湖蓝藻爆发后该水域浮游生物种类组成、物种多样性及富营养化状况。结果表明,测区内鉴定有浮游植物243属种隶属于7个门,其中蓝藻数量最多,绿藻次之,铜绿微囊藻为优势种;浮游动物175属种隶属于4个门,各站点种类分布较为均匀。调查区域内浮游动物多样性指数略高于浮游植物,平均多样性指数分别为1.623和1.703,多样性程度低。综合营养状态指数分析表明,调查水域有不同程度富营养,呈由东至西(幻溇港至新塘港)富营养程度递增趋势,新塘港达中度富营养,湖心区水域富营养程度高于支流入湖口水体;说明南太湖水域水体的富营养污染可能主要受到蓝藻大规模爆发的西、北太湖的影响,而从湖州市各支流水系进入的富营养污染相对较少。

Species composition,diversity of plankton and state of eutrophication after outbreak of Cyanophyta bloom-forming in Taihu Lake were investigated during the cruise conducted in the south of Taihu Lake.A total of 243 taxa of phytoplankton and 175 taxa of zooplankton were identified,belong to 7 phy.And 4 phy.,respectively.With maximum individual of Cyanophyta and Chlorophyta,M.aeruginosa was the dominant taxon of phytoplankton and have a proportional horizontal distribution of zooplankton in this area.The biod...