In order lo study the water quality of Jingyang River after the development of cascade power stations,the plankton was sampled and investigated in August 2009 from the main and branch stream of Jingyang River. A total of 21 species ( genera) in 5 phylum of phytoplankton were observed in the whole section,among them there were 13 species (genera) of Bacillariophyta,4 species (genera) of Chlorophyta,2 species (genera) of Cyanophyia,l species (genus) of Chrysophyta and I species (genus) of Xanthophyta respectively. 10 species (genera) and 2 phylum of zooplankton were observed in the whole section,among them there were 8 species (genera) of Protozoa and 2 species (genera) of Rotifer. The community structure of phytoplankton in jingyang River was analyzed,the results showed that the water quality in this section was good without being polluted or only with little pollution. The- community composition of the zooplankton was simple in this area,both the abundance and evenness were low and easily disturbed by external environmental factors.%为了更好地了解梯级电站开发后泾洋河水质状况,于2009年8月对泾洋河段干支流浮游生物进行采样和鉴定.结果监测到浮游植物5门21种(属),隶属于硅藻门13种(属)、绿藻门4种(属)、蓝藻门2种(属)、金藻门和黄藻门各1种(属)；浮游动物2门10种(属),隶属于原生动物门8种(属)和轮虫类2种(属).综合分析泾洋河段浮游植物群落结构特征,结果表明,该河段水质状况良好,属于轻污染或无污染状况；浮游动物生物群落结构组成较单一,丰富度与均匀度值均较低,易受外界环境因子的干扰.
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