【摘要】 为阐明洈水水库浮游生物的群落结构特征、了解库区水质现状，于2021年7月（夏）、11月（秋）、2022年1月（冬）和3月（春）调查了洈水水库浮游生物群落结构和水质理化指标。结果显示：浮游植物有75属129种，以绿藻门为主；浮游动物（轮虫和浮游甲壳动物）23属31种，以轮虫为主。浮游生物的优势物种主要为链形小环藻（Cyclotella catenate）、双对栅藻（Scenedesmus biguga）、湖泊伪鱼腥藻（Pseudoanabaena limnetica）、螺形龟甲轮虫（Keratella cochlearis）、无节幼体等。浮游植物和浮游动物密度及其生物量年均值分别为1.656×10⁷、1.75×10² ind./L和6.32、1.92 mg/L。在空间分布上，浮游生物的丰度和生物量由上游河道型库区至下游敞水区大致呈逐渐降低的特点。典范对应分析（CCA）结果显示：PO₄^3--P、WT、pH值和DO均对洈水水库中浮游生物群落的生态分布有重要影响，且NO₃^--N和Cond仅对浮游植物影响较大。根据物种多样性评价，洈水水库浮游生物群落结构较稳定，库区水质处于中营养水平。更多还原

【Abstract】 In order to clarify the characteristics of plankton community structure and understand the current status of water quality in Weishui Reservoir,in this study,plankton and water quality surveys were carried out in the typical area of Weishui Reservoir in July （summer） and November （autumn） 2021,January （winter） and March （spring） 2022.The results showed that there were 75 genera and 129 species of phytoplankton,mainly Chlorophyta,and 23 genera and 31 species of zooplankton （rotifers and planktonic crustaceans）,mainly rotifers.The dominant plankton species mainly included Cyclotella catenate,Scenedesmus biguga,Pseudoanabaena limnetica,Keratella cochlearis,nauplius,etc.The annual mean density and biomass of phytoplankton were 1.656×10⁷ ind./L and 6.32 mg/L,respectively,and the annual density and biomass of zooplankton were 1.75×10² ind./L and 1.92 mg/L,respectively.In terms of spatial distribution,the abundance and biomass of plankton decreased gradually from the upstream channeltype area to the downstream open-water area.Canonical correspondence analysis showed that PO₄^3--P,WT,pH and DO all had important effects on the ecological distribution of plankton communities in Weishui Reservoir,while NO₃^--N and Cond only had an effect on phytoplankton.According to the evaluation of species diversity,the plankton community structure of Weishui Reservoir is relatively stable,and the water quality in the reservoir area is in the mesotrophic status.更多还原