中文摘要：

为了研究黄河调水调沙对黄河口及其邻近水域浮游植物群落的影响,于2009年7月黄河第九次调水调沙后对黄河口及其邻近水域的浮游植物进行了调查。利用网采浮游植物样品研究了该水域浮游植物的种类组成、丰度分布、优势种以及生物多样性,结果表明调查水域共鉴定出浮游植物29属53种,隶属于硅藻门、甲藻门、蓝藻门、金藻门和绿藻门,其中硅藻43种,甲藻6种,还有少数浮游植物属于蓝藻门、金藻门和绿藻门;浮游植物细胞丰度为0.96×104～76.32×104个/m3,平均丰度为21.23×104个/m3;主要优势种类有念珠藻（Nostocaceae）、八幅辐环藻（Actinocyclus oc-tonarius）、佛氏海线藻（Thalassionema frauenfeldii）和卡氏角毛藻（Chaetoceros castracanei）等;调水调沙引起的黄河径流量的增加对黄河口及其邻近水域浮游植物群落结构的影响显著。该研究揭示了特定时期黄河口及其邻近水域浮游植物的群落结构,并丰富了该水域浮游植物群落的基础资料,为深入探讨河口环境变化对浮游植物群落的影响提供了重要依据。

英文摘要：

Investigation was carried out in July 2009 in Huanghe Estuary in China and its adjacent area after the ninth water regulation in order to study the influence of the event on phytoplankton community structure in this area.The species composition,abundance,dominant species and community diversity of net-phytoplankton were studied.A total of 53 phytoplankton species were identified.The Bacillariophyta accounted for 81.1% with 44 species and the Pyrrophyta accounted for 11.3% with 6 species.Besides,there were also Cyanophyta,Chrysophyta and Chlorophyta.The total abundance of phytoplankton was 0.96×104—76.32×104 cells/m3 and the mean value was 21.23×104 cells/m3.The main dominant species were Nostocaceae,Actinocyclus octonarius,Thalassionema frauenfeldii and Chaetoceros castracanei.The increased runoff of the Huanghe River caused by the water regulation had significant impacts on the phytoplankton community structure.The phytoplankton community structure of specific period is revealed,the basic information of phytoplankton community is enriched and important references are provided for further research about the influences of environmental changes on the phytoplankton community in the Huanghe Estuary and its adjacent area.