环境工程学报2026，Vol.20Issue(2)：389-402,14.DOI:10.12030/j.cjee.202505052
天津七里海湿地水环境重金属污染特征及其影响因素
Pollution characteristics and influencing factors of heavy metals in the water environment of Tianjin Qilihai wetland
摘要
Abstract
To assess the ecological risk of heavy metals in the water of the Qilihai Wetland in Tianjin,this study collected surface water samples from the wetland on a monthly basis from December 2021 to October 2022.The seasonal variation characteristics and influencing factors of the mass concentrations of heavy metals(Cr,Cu,As,Pb,Cd,Zn,Sr,and U)were analyzed,and the pollution status of heavy metals in the wetland water environment was evaluated.The results showed that the mass concentrations of different types of heavy metals in the study area exhibited significantly different seasonal variation characteristics.Specifically,the mass concentrations of As and Zn in summer were significantly higher than those in winter,while the mass concentrations of Sr and U in summer were significantly lower than those in spring.Additionally,the mass concentrations of Cd and Cu increased rapidly at some sampling points during summer.The increase in Zn mass concentration in summer was primarily attributed to sediment release under hypoxic conditions and rainfall input.The variation in As mass concentration was due to the reduction and release of As bound to Fe/Mn oxides in sediments under hypoxic conditions.The decrease in Sr and U mass concentrations in summer was mainly attributed to the dilution effect of precipitation,while the rapid increase in Cd and Cu mass concentrations was due to surface runoff input.The heavy metal pollution assessment results indicated that the overall risk of heavy metal pollution in the Qilihai water body is currently at a relatively low level,suggesting that the mass concentrations of heavy metals in the water have significantly decreased after the wetland underwent enclosed management and ecological restoration.Since surface runoff input is the dominant factor increasing the risk of heavy metal pollution in the wetland,it is recommended to establish continuous vegetation buffer zones along the shoreline of the Qilihai Wetland to further reduce heavy metal pollution in the water body.关键词
重金属/季节变化/生态风险/七里海湿地Key words
heavy metals/seasonal variation/ecological risk/Qilihai wetland分类
资源环境引用本文复制引用
揭敬诚,薛浩,韩晓昆,丁虎,刘展航,张竹卿..天津七里海湿地水环境重金属污染特征及其影响因素[J].环境工程学报,2026,20(2):389-402,14.基金项目
国家科技基础资源调查专项项目(2021FY101001) （2021FY101001）
国家自然科学基金资助项目(42293262) （42293262）
天津市科技局项目(21ZYJDJC00090) （21ZYJDJC00090）
