抚仙湖水体透明度及主要影响因子变化分析

Analysis of Water Transparency and Main Influencing Factors in Fuxian Lake

以抚仙湖历年水体透明度及主要影响因子常规监测资料为依据,分析水质变化及其环境风险,并提出对策措施。结果表明:20世纪80年代至2002年,抚仙湖水体中浮游藻类数量明显增加,在这期间,即1990—2020年水体叶绿素a浓度也明显上升,水体透明度快速下降,水体透明度主要受浮游藻类和叶绿素a的影响。随着抚仙湖流域水污染治理及水生态修复工作的推进,近10a来抚仙湖水体溶解性有机污染物平稳下降,水体透明度趋于稳定,透明度主要受降雨影响明显。湖泊治理和维护是一个长期过程,要遏制抚仙湖富营养化趋势,稳定并提高水体透明度,需持续全面地实施全流域水生态环境保护与综合治理。

Based on the data of water transparency and its main influencing factors in Fuxian Lake over the years,this paper analyzed the changes of water quality and its environmental risks,and the countermeasures were put forward.The results showed that the number of planktonic algae in Fuxian Lake has increased significantly from 1980s to 2002.During this period,the concentration of chlorophyll-a in the water also has increased significantly from 1990 to 2020,and the water transparency decreased rapidly.The water transparency was mainly affected by planktonic algae and chlorophyll-a.With the advancement of water pollution control and water ecological restoration in the lake,the dissolved organic pollutants in the water of Fuxian Lake have decreased steadily in the past ten years,and the transparency of the water has become stabilized,and the transparency has been significantly affected by rainfall.The control and maintenance of the lake is a long-term process.In order to contain the eutrophication trend of Fuxian Lake and to stabilize and improve the transparency of the water body,the water ecological environment protection and comprehensive management of the whole watershed need to be carried out continuously and comprehensively.