【摘要】 在太湖用围隔试验，研究湖泊底泥和外源污染对富营养化湖泊藻类种群的影响．结果表明，在没有底泥和外源污染（相当于彻底清淤和截污）的情况下，围区内（２００ｍ２）水体氮磷浓度均有明显下降，但藻类生物量却急剧上升，且出现“藻华”．结合南京玄武湖和杭州西湖的截污、清淤挖泥、引水冲污等富营养化防治措施的实际效果分析，探讨了截污、清淤、引水冲污对富营养化湖泊藻类种群的影响．指出对严重富营养化的湖泊，单纯采取截污、清淤或引水冲污难以控制富营养化藻类种群暴发，有时甚至还会导致藻类生物量增加、富营养化呈现加重的趋势；对浅水湖泊富营养化的防治，应根据系统论和生态系统理论的原理，在控制外源污染的同时，着眼于中性地恢复湖泊原有的以高等水生植物为主的生态系统，并维护其动态平衡．更多还原

【Abstract】 For controlling the fearful eutrophication,some artificial controls are employed in the West Lake and Lake Xuanwu.These artificial controls include the interception of wastewater,diluting with diversion works,desilting and others.Long term monitoring data shows that these controls have little influence on eutrophication.There are no significant change in the biomass and structure of phytoplankton.Some interesting results are got form our enclosure experiment conducted in Lake Taihu.In the enclosed lake water column (200m 2) without the influences of substrate sludge and wastewater,the concentration of nitrogen and phosphorus decreases but the algal biomass increases comparing with the open lake water.The algal bloom emerges also in the enclosure.更多还原