江苏省典型省管湖泊富营养化现状

Eutrophication status of typical lakes administrated by Jiangsu Provincial Goverment

为全面了解江苏省湖泊富营养化现状,选取13个典型省级以上管理湖泊(简称“省管湖泊”)为研究对象,于2022年1—12月进行水质调查,分析水质时空特征,评估富营养化现状,并讨论富营养化空间差异的原因。结果表明,13个典型省管湖泊水体营养盐指标含量丰富,其中TN均超过Ⅳ类标准,固城湖水体TP含量为Ⅱ类标准,其他湖泊介于Ⅳ~Ⅴ类;综合营养状态指数(TLI)结果显示湖泊富营养化水平存在区域性的差异,位于长江干流水系的固城湖和石臼湖富营养化程度较低,其中固城湖全年结果均评价为中营养型湖泊,其他区域12个湖泊均呈轻度富营养状态。

In order to comprehensively understand the eutrophication status of lakes in Jiangsu province,13 typical lakes administrated by Jiangsu Provincial Goverment were selected as research objects,and water quality surveys were conducted from January to December 2022.The spatio-temporal characteristics of water quality were analyzed,the eutrophication status was scientifically assessed,and the causes for the spatial differences in eutrophication were discussed.The results indicated that the water body of 13 typical provincial lakes was rich in nutrient salt indicators,with total nitrogen levels exceeding class IV.The total phosphorus content of Gucheng Lake water reached the ClassⅡstandard,while other lakes ranged between classⅣ~Ⅴ.The comprehensive trophic index(TLI)results showed that there were regional differences in the eutrophication level of lakes.Gucheng Lake and Shijiu Lake,located in the main stream of the Yangtze River,had lower eutrophication levels.Specifically,Gucheng Lake had been evaluated as mesotrophic throughout the year,and 12 lakes in other areas were in a state of mild eutrophication.