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中文摘要：
于2010年夏季（6—8月）在三峡水库典型支流香溪河库湾沿程布点，观测浮游植物的生长特性，探讨夏季浮游植物演替规律及原因。结果表明，夏季水华期间，浮游植物密度和叶绿素a浓度均表现为长江干流显著低于香溪河库湾的特征，这主要是由于长江干流水体掺混剧烈，而香溪河库湾水体垂向掺混微弱，浮游植物生长旺盛；库湾浮游植物种群演替规律为：6—8月的主要藻种依次为硅藻、绿藻和蓝藻。灰色关联分析结果表明，浮游植物密度与库湾真光层深度／混合层深度比值显著相关，浮游植物种群演替的主要影响因素为水温、水体稳定系数及混合层深度。
英文摘要：
To investigate succession of phytoplankton in summer in Xiangxi Bay （XXB） of the Three-Gorge Reservoir （TGR） as affected by environmental factors, continuous field observations were conducted throughout the summer of 2010. Results show that biomass and Chl-a concentration of the phytoplankton in the main stream of the Yangtze River was much lower than that respectively in XXB during the algae bloom season in summer, which was mainly attributed to the fact that the water body of the main stream of the Yangtze River was well mixed, while that of XXB was weakly mixed vertically. As a result the phytoplankton in the latter grew flourishingly and evolved from diatom （ in June） to green algae （ in July） and then to cyanobacteria （in August）. Gray correlation analysis indicates that density of the phytoplankton was closely related to thickness of the euphoric layer and the mixed layer of the waterbody with correlation coefficient being over 0.6 and that succession of the phytoplankton communities was mainly affected by water temperature, waterbody stability and thickness of the mixed layer.
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