摘要
湖泊水质和生态体系关乎当地经济和社会发展。近几十年以来,太湖水质不断恶化,为了解太湖湖体水环境现状,为其后续治理提供理论指导,选取2021年第19—53周(2021年5月3日—2022年1月2日)湖心监测站pH、溶解氧、高锰酸钾指数、氨氮、总磷的自动监测数据,分析其时间变化特征,并进行水质指标间的相关性分析、水质评价和主成分分析。研究表明:丰水期DO、COD_(Mn)、TP均低于枯水期,NH_(3)-N高于枯水期;丰水期和枯水期的COD_(Mn)与DO都呈现负相关,TP与DO、COD_(Mn)与TP总体上呈现正相关,NH_(3)-N与DO在丰水期呈现正相关、枯水期呈现负相关;太湖的主要污染物是TP,受其影响,丰水期、枯水期均为Ⅳ类水质;周边城市工业废水的排放是太湖污染的主要影响因子,其贡献率达到37.3%,其次,农业化肥的施用和水产养殖也是影响太湖水质的主要因子。该结论对太湖水环境治理具有一定的参考意义。
The water quality and ecosystem of lakes are related to local economic and social development.In recent decades,the water quality of the Taihu Lake has been deteriorating.In order to understand the water environment of Taihu Lake and provide theoretical guidance for the subsequent governance,this article selects automatic monitoring data of pH,DO,COD_(Mn),NH_(3)-N and TP from The Central Lake Monitoring Station for weeks 19 to 53 in 2021(May 3,2021 to January 2,2022),analyses its time variation characteristics and the correlation between water quality indicators and conducts water quality assessment and principal component analysis.The results showed that:The values of DO,COD_(Mn)and TP in wet season were lower than those in dry season,while the value of NH_(3)-N in wet season was higher than that in dry season;COD_(Mn)was negatively correlated with DO in wet season and dry season,TP was positively correlated with DO and COD_(Mn)was positively correlated with TP in general and NH_(3)-N was positively correlated with DO in wet season and negatively correlated with DO in dry season;The main pollutant of Taihu Lake was TP,and the water quality of Taihu Lake was classⅣin wet season and dry season under the influence of TP.The discharge of industrial wastewater from surrounding cities was the main factor of the pollution of the Taihu Lake,with a contribution rate of 37.3%.The application of agricultural fertilizers and aquaculture were also the main factors of the water quality of the Taihu Lake.The conclusion of this paper had a certain reference significance for the water environment management of Taihu Lake.
作者
薛艳
周萱萱
宋玉芝
XUE Yan;ZHOU Xuan-xuan;SONG Yu-zhi(Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,School of Environment Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Nanjing 210044,China;School of Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing 210044,China)
出处
《环境生态学》
2023年第10期124-130,共7页
Environmental Ecology
基金
国家自然科学基金资助项目(42077303)资助。
关键词
太湖
水质
动态变化
水质评价
主成分分析
Taihu Lake
water quality
dynamic change
water quality evaluation
principal component analysis
