【实验目的】目前,我国水体污染日益严重,其中一些主要淡水湖和海湾局部地区的水体富营养化问题尤其突出。太湖、巢湖和滇池现为我国富营养化最严重的湖泊,其生态系统的稳定已受到严重的影响和破坏通过实验,我们可以观察水体富营养化的发生过程,并由此了解水体富营养化造成的原因和可能造成的危害。【实验原理】氮、磷、各类维生素等是水生植物生长所必需的营养元素,但是,水体所含氮、磷等过多,停留时间过长,将会 【Purpose】 At present, the water pollution in our country is worsening day by day. Some of the main freshwater lakes and some parts of the Gulf are particularly eutrophic. Taihu Lake, Chaohu Lake and Dianchi Lake are now the most eutrophic lakes in China. Their ecosystem stability has been severely affected and destroyed. Through experiments, we can observe the eutrophication of water bodies and understand the eutrophication Cause and possible harm caused. 【Principle】 Nitrogen, phosphorus, all kinds of vitamins and other nutrients are essential for the growth of aquatic plants, but the water contains too much nitrogen and phosphorus, residence time is too long, will be