中文摘要：

为探索新安江水库（千岛湖）水质的变化规律及其影响因素,利用2009-2010年的逐月水质监测数据,结合文献资料,对新安江水库水质时空变化进行了综合分析.结果表明：在时间分布上,透明度、总氮、总磷及叶绿素受水文季节变化过程、浮游生物生长及人类活动等的综合影响,具有明显的季节变化特征,特别是上游街口断面各指标季节差异显著.空间分布上,上游水质明显劣于下游水质,上游水域透明度低,氮、磷及叶绿素含量高,反映出外源供给和人类活动对新安江水库水质的决定性贡献,控制外源污染是新安江水库水质提升的关键.统计分析表明,新安江水库主要感官指标透明度主要受控于藻类生物量,而藻类生物量变化与氮、磷营养盐的含量关系密切.严格控制入库营养盐通量,控制浮游植物生物量的季节性异常增殖已成为解决新安江水库水环境问题的核心.另外,新安江水库经济鱼类赋存量与捕捞量对水质有一定影响,年度捕捞量与水体透明度具有反相关关系,不能排除鱼类密度过高导致的生态系统失调的可能.因此,要进一步开展渔业养殖的水质效应研究,加强渔业管理,确定科学合理养殖模式,保证新安江水库水质的改善.

英文摘要：

To explore the regular pattern of reservoir water quality variation and its influenced factors of Xin＇ anjiang Reservoir,we comprehensively analyzed the spatial-temporal variations of water quality in Xin＇ anjiang Reservoir（Lake Qiandao） using the water quality data monitored monthly during 2009-2010 and literature.The results showed that an obvious seasonal variation of transparency was caused by the interaction effects among hydrology,organism,and human production activities cause,total nitrogen,total phosphorus and chlorophyll.Especially in the upstream-Jiekou transect,its seasonal change of each indicator is significantly different.The water quality of the upstream was not same to the downstream water quality obviously with low transparency,high content of nitrogen,phosphorus and chlorophyll.This reflects that exogenous supply and human activities have a primary contribution to water pollution.Thus,the water quality could be improved by controlling the exogenous pollution.The main factor that influences transparency of sensory indicators is the algal biomass,while the factor which controls the algae biomass change is the content of nitrogen and phosphorus.Therefore,strictly controlling the quantity of phytoplankton cells is the key to solve water environmental problems of Xin＇ anjiang Reservoir.In addition,the economical fishing quantity and inventory of Xin＇ anjiang Reservoir has certain association with water quality and the inverse correlation was found between the annual fishing quantity and water transparency.Therefore,we should pay more attention to the fisheries management and make a scientific and reasonable fishery culture pattern to keep development of Xin＇ anjiang Reservoir resources sustainable.