洞庭湖水质及富营养状态评价

根据2009年洞庭湖水质监测数据,参照GB3838-2002中Ⅲ类水质标准,采用单因子评价法、综合污染指数法和综合营养指数法对洞庭湖水质及富营养状况进行评价。单因子法结果表明,在总氮、总磷不参与评价的情况下,2009年洞庭湖湖体水质整体为优;湖水中总氮、总磷污染严重,监测断面总磷浓度均劣于Ⅲ类水质要求。综合营养指数评价结果表明,洞庭湖水质处于中营养和轻度富营养水平;综合污染指数评价进一步表明,洞庭湖湖体水质劣于入湖口水质,入湖口水质劣于出湖口水质的分布特征。

Water Quality and Eutrophication Analysis in Lake Dongting

According to Basic Analytical of Environmental Quality for Surface Water in China（GB3838-2002）,this paper adopted methods of single-factor appraisal,comprehensive pollution index and comprehensive nutrition index based on the 2009 monitoring data to estimate the situation of the water quality of the Lake Dongting.The method of single-factor appraisal turned out that the whole water quality was excellent in case that it excluded the appraisal of TN and TP in 2009,that the pollutions of TN and TP were relatively serious,that all the concentrations of TP from the monitoring section were inferior to the water quality requirements of Ⅲ class.The appraisal of comprehensive nutrition index showed that the quality of the lake was in the level of moderate nutrition and light eutrophication.The appraisal of comprehensive pollution index further showed the distribution characteristics that the water quality in the body of the lake was inferior to the water in the entry,which was also inferior to the water in the exit.