天津七里海湿地水环境重金属污染特征及其影响因素OA
Pollution characteristics and influencing factors of heavy metals in the water environment of Tianjin Qilihai wetland
为评估天津七里海湿地水环境重金属生态风险,本研究于 2021年 12月至 2022年 10月逐月采集该湿地表层水,分析其重金属(Cr、Cu、As、Pb、Cd、Zn、Sr和U)质量浓度季节变化特征及影响因素,并评估湿地水环境重金属污染状况.结果表明,研究区水体中不同种类重金属质量浓度具有显著不同的季节变化特征,其中夏季水体中As和Zn质量浓度显著高于冬季,但夏季水体中Sr和U质量浓度显著低于春季,且Cd和Cu在夏季部分点位质量浓度迅速升高.夏季水体Zn的质量浓度升高主要由缺氧条件下的沉积物释放和降雨输入导致,As的质量浓度变化则主要归因于缺氧条件下沉积物中Fe/Mn氧化物结合As的还原和释放,而夏季Sr和U质量浓度降低则主要归因于降水的稀释效应,但Cd和Cu质量浓度迅速升高则归因于地表径流输入.重金属污染评估结果表明,目前七里海水体重金属污染风险整体处于较低水平,表明七里海湿地在封闭管理并进行生态修复工程后,其水体重金属质量浓度显著降低.由于地表径流输入是增加湿地重金属污染风险的主导因子,因此,建议沿七里海湿地岸带设置连贯的植被缓冲带,进而进一步降低湿地水体重金属污染.
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.
揭敬诚;薛浩;韩晓昆;丁虎;刘展航;张竹卿
天津大学地球系统科学学院,表层地球系统科学研究院,天津 300072天津大学地球系统科学学院,表层地球系统科学研究院,天津 300072||天津市环渤海地球关键带科学与可持续发展重点实验室,天津 300072||天津环渤海滨海地球关键带国家野外科学观测研究站,天津 300072天津大学地球系统科学学院,表层地球系统科学研究院,天津 300072||天津市环渤海地球关键带科学与可持续发展重点实验室,天津 300072||天津环渤海滨海地球关键带国家野外科学观测研究站,天津 300072天津大学地球系统科学学院,表层地球系统科学研究院,天津 300072||天津市环渤海地球关键带科学与可持续发展重点实验室,天津 300072||天津环渤海滨海地球关键带国家野外科学观测研究站,天津 300072天津大学地球系统科学学院,表层地球系统科学研究院,天津 300072天津大学地球系统科学学院,表层地球系统科学研究院,天津 300072
资源环境
重金属季节变化生态风险七里海湿地
heavy metalsseasonal variationecological riskQilihai wetland
《环境工程学报》 2026 (2)
389-402,14
国家科技基础资源调查专项项目(2021FY101001)国家自然科学基金资助项目(42293262)天津市科技局项目(21ZYJDJC00090)
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