中国巢湖富营养化趋势及防治对策巢湖为中国五大淡水湖之一，共有３３条河流汇入，入湖径流量占巢湖水量的９８％。每天约有３．７ｔ磷和６１．７ｔ氮流入巢湖，氮、磷平均浓度分别为３７．０７ｍｇ／ｌ和２．０３ｍｇ／ｌ。近３０年来，森林覆盖率降至６．７７％，水土流... Chaozhou Lake Eutrophication Tendency and Preventive Measures Chaohu Lake is one of the five largest freshwater lakes in China with a total of 33 rivers. The runoff into the lake accounts for 98% of the Chaohu Lake. About 3.7t of phosphorus and 61.7t of nitrogen flow into Chaohu every day. The average concentration of nitrogen and phosphorus is 37.07mg / l and 2.03mg / l respectively. In the past 30 years, the forest coverage rate has dropped to 6.77%.