湖泊的富营养化是一个世界性的环境问题，所造成的严重生态后果和经济损失，已经引起世界各国的关注。在２０世纪７０年代，自清河水清草绿，景色宜人。近年来由于市政建设用地，河的大部分被填平，结果在吴淞中学校园内留下了一段河道和一个小池塘。由于缺乏管理，水生植被被 The eutrophication of lakes is a worldwide environmental issue. The serious ecological consequences and economic losses caused by the lake have drawn worldwide attention. In the 1970s, the Qinghe River was green and the scenery was pleasant. In recent years, most of the river has been filled due to municipal construction. As a result, a river course and a small pond have been left on the Wusong Middle School campus. Due to lack of management, aquatic vegetation was