中文摘要：

剑潭水库是珠江水系东江下游新建水库，2006年10月开始蓄水，2007年6月蓄水完毕．该水库属直流型水库，2008年水力滞留时间为0．46—3．62d．2006—2008年调查了该水库浮游植物的动态特征．结果表明，调查期间浮游植物丰度为182—6267cells／ml，从空间变化看，在调查期间，浮游植物丰度由上游向下游呈上升趋势．从年间变化看，蓄水后第一年坝区浮游植物丰度不仅明显高于蓄水前和蓄水期间，并且浮游植物最高丰度出现在蓄水后第一年的枯水期（12月）．与此同时，在蓄水过程中，浮游植物群落结构也逐渐发生了变化，蓝藻相对丰度明显上升，绿藻相对丰度呈下降趋势．水力滞留时间、透明度和总磷是影响剑潭水库浮游植物时空变化的重要因素．高的平流损失率和低的透明度使得浮游植物现存量与水库氮、磷水平并不相符．相对较长的水力滞留时间、较高的透明度和总磷导致了浮游植物在蓄水后第一年（2008年）的枯水期出现一个峰值．

英文摘要：

Jiantan Reservoir was newly constructed in 2006, and it took eight months to fill the reservoir from October 2006 to June 2007. The reservoir is a through-flowing reservoir with retention time varying from 0.46 to 3.62 d in 2008. Phytoplankton in the reservoir, was investigated to analyze early variation of water quality from 2006 to 2008. Phytoplankton abundance varied from 182 to 6267cells/ml, and was predominated by Chlorophyta. During the investigation, phytoplankton abundance generally increased from the upstream to downstream. After impoundment, both phytoplankton abundance and the relative abundance of Cyanophyta were much higher than those before impoundment or during filling at the dam site. Water retention time, secchi disk depth and total phosphorus were the three possible factors controlling the temporal and spatial variations of phytoplankton abundance and community structure. High advective loss rate and low secchi disk depth made the standing crop of phytoplankton being lower than that in those reservoirs with the same trophic state but longer water retention time. In December, 2008, the first year after filling, the relatively longer water retention time, higher secchi disk depth and total phosphorus concentration resulted in the ＂upsurge＂ of phytoplankton abundance.