“十一五”期间洞庭湖水环境质量状况及变化趋势分析

The Analysis of the Water Quality and Its Change Trend of Dongting Lake during the Period of "Eleventh Five-Year"

利用洞庭湖水质监测数据,对洞庭湖水环境质量状况进行综合分析.分析结果表明,＂十一五＂期间洞庭湖水质整体为优,出湖口水质相对较好,2008~2010年洞庭湖水质进一步改善;＂十一五＂期间,西洞庭湖、南洞庭湖营养状态指数小于50,属中营养;东洞庭湖营养状态指数2008年以前小于50,属中营养,2008~2010年大于50,属轻度富营养.

A comprehensive analysis of water quality conditions of the Dongting Lake with water quality monitoring data of the lake was made.The results indicated that during the period of ＂Eleventh Five-Year＂,the water quality of Dongting Lake was generally good,and its export of the lake was relatively better,and the water quality of Dongting Lake was further improved from 2008 to 2010;during the period of ＂Eleventh Five-Year＂,the trophic state index of West Dongting Lake and South Dongting Lake were both lower than 50,and were classified to moderate nutrient.The trophic state index of East Dongting Lake was lower than 50 before 2008,and this was classified into moderate nutrient;it was higher than 50 during 2008-2010,which was classified into mildly eutrophic.