大阳垾城市湿地公园土壤重金属污染及生态风险预警评估  

Heavy Metal Pollution and the Assessment of its Ecological Risk Early Warning in Dayanghan Metropolitan Wetland Park

作　　者：王波[1] 冯昌伟[1] 刘晓青[1] 周守标[1] 戴万宏[1] 

机构地区：[1]安徽师范大学环境科学与工程学院,安徽芜湖241003

出　　处：《土壤通报》2013年第2期484-489,共6页Chinese Journal of Soil Science

基　　金：安徽省高校省级科学研究项目(KJ2010A150);高等学校省级教学质量与教学改革工程项目(20100245);安徽师范大学重点扶持建设课程项目(023-060824)资助

摘　　要：对芜湖市大阳垾城市湿地公园不同土地利用类型的土壤及底泥重金属含量进行了检测,根据土壤背景值与国家土壤环境质量标准评价了土壤环境质量状况,分析了重金属污染的来源,并对土壤及底泥重金属的生态风险进行了预警评估。结果表明:土壤及底泥中Zn、Pb、Cd、Ni和Cr的含量均超过了土壤背景值,其中Pb含量高于国家土壤一级标准值40%,Cd含量高于国家土壤二级标准值173%;Cu、Zn、Pb、Ni和Cr等5种元素具有同源性,主要来源于交通污染源;不同利用类型土壤生态风险存在显著差异,其中林地(IER=4.27)和湿地(IER=4.00)土壤属于中警,水稻田、水体底泥和荒地土壤属于轻警,菜地属于预警。分析显示大阳垾城市湿地公园土壤及底泥存在较高的生态风险。The contents of Ni, Cu, Pb, Cr, Zn, As, Cd an d Hg in soil and sediment samples were collected and analyzed in Dayanghan metropolitan wetland-park. The pollution status of heavy metals in soil and sediment was evaluated according to their background contents and the national quality standards in soil. The sources of these heavy metals and ecological risk early warning assessment in soil and sediment were studied also. The results indicated that, the contents of Zn, Pb, Cd, Ni and Cr exceeded background levels, and the content of Pb was 40% higher than the primary, standard value of nation, and the content of Cd was 173% higher than the secondary value of nation. The heavy metal accumulation of the soils and sediment were induced by traffic. The pollution of woodland （IER =4.27） and wetland （IER =4.00） was at medium early warning level, and the paddy-field, sediment and wildland were at slight early warning level, and vegetable plot was prewarnimg. In conclusion, Dayanghan metropolitan wetland park soil and sediment were at relatively highly ecological risk.

关 键 词：城市湿地公园 土壤 重金属 生态风险预警评估 芜湖市 

分 类 号：X53[环境科学与工程—环境工程]