上海大莲湖水域浮游植物群落结构特征及水质评价

分别于2009年春、夏、秋、冬4季对上海大莲湖水域浮游植物和水质进行了4次采样调查,应用Pielou均匀度指数、Shannon-Wiener多样性指数、Margalef物种丰富度指数及优势度等指标分析了不同季节大莲湖水域浮游植物的群落结构特征;并结合理化指标,对大莲湖水域的水体营养状况进行了综合评价。结果表明,大莲湖水域检出浮游植物共计7门40属64种,其中,以绿藻门种类数最多,其次是蓝藻门和硅藻门;浮游植物密度变化范围为0.35×106~10.87×106L-1;浮游植物优势种季节性变化明显,优势种种类较多,为9~14种,优势度不高,变化范围为0.02~0.60。依据浮游植物密度、优势种等群落结构特征评价得出,大莲湖水域水质介于中营养化至富营养化状态之间;由Pielou均匀度指数、Shannon-Wiener多样性指数及Margalef物种丰富度指数得出的评价结果差异较大,其中利用Pielou均匀度指数获得的评价结果与依据理化指标、浮游植物密度及优势种获得的评价结果基本一致,说明该指数适用于大莲湖水域水体营养状态的评价。

Characteristics of Phytoplankton Community Structure and Evaluation of Water Quality of Dalian Lake,Shanghai

Water samples were collected from the water area of the Dalian Lake,Shanghai in the four seasons of 2009,separately,for analysis of Pielou evenness index,Shanon-Wienner diversity index,Margalef richness index and Mcnaughton index to study community structure characteristics of the phytoplankton in the lake and of physicochemical indices to evaluate trophic state of the waterbody.Results show that a total of 64 species of phytoplankton were identified,belonging to 40 genera of 7 phyla in the water samples fr...