大寨海绵田土壤重金属污染评价  

Pollution Assessment of Heavy Metal in Dazhai Sponge Fields

作　　者：张静静[1] 张永清[1] 张华[1] 张文娟[1] 

机构地区：[1]山西师范大学地理科学学院,山西临汾041004

出　　处：《贵州农业科学》2015年第7期186-189,192,共5页Guizhou Agricultural Sciences

基　　金：国家自然科学基金面上项目(30871483)

摘　　要：为全面了解大寨海绵田土壤重金属污染状况,对该区土壤Zn、Cr、Cu、Ni、Pb、As、Cd、Hg含量进行了检测,并分别以山西土壤环境背景值和国家土壤环境质量的二级标准为参照,选用单项污染指数法和内梅罗综合污染指数法对土壤进行污染评估。结果表明:大寨海绵田土壤中8种重金属的平均值和最大值均没有超过国家土壤环境质量的二级标准,但As、Hg、Ni、Pb元素超过了山西土壤环境质量标准;以山西土壤环境背景值为参照,研究区土壤受到As、Hg、Pb的轻度污染,Cu、Ni、Zn、Cd的污染指数也在警戒线上。各重金属潜在生态危害系数表现为Hg﹥Cd﹥As﹥Pb﹥Ni﹥Cu﹥Zn﹥Cr。土壤环境总体存在轻度危害风险。相关分析结果表明,Cr、Ni、Zn、Cu、Cd和As可能是同源或伴生关系,Hg与其他重金属元素不相关。大寨海绵田中污染较重的重金属元素与农业施肥、旅游交通、建筑施工、日常生活和生产活动密切相关。In order to comprehensively know the pollution condition of heavy metal in Dazhai sponge fields, the contents of Zn, Cr, Cu, Ni, Pb, As, Cd and Hg in this area were analyzed, Shanxi Soil Environment Quality Standard and Secondary Soil Environment Quality Standard were used as evaluation standard, the soil pollution status was evaluated based on the single factor index method and Nemoro integrated pollution index. Results：Contents of the eight heavy metals in soil did not exceed the Secondary Soil Environment Quality Standard, contents of As, Hg, Ni and Pb exceeded the Shanxi Soil Environment Quality Standard. The soil in the coverage areas reached high pollution of As, Hg and Pb. And the pollution index of Cu, Ni, Zn and Cd reached alter line. The potential ecological risk index order was Hg 〉 Cd 〉 As 〉 Pb 〉 Ni 〉 Cu 〉 Zn 〉 Cr. The pollution level risk intensity was mild. The correlation analysis indicated that Cr, Ni, Zn, Cu, Cd and As were likely from the same source. Hg and other heavy metals were not related. Heavy metals with high levels of pollution and agricultural fertilization, tourist transportation, construction, daily life and production activities were closely related.

关 键 词：大寨海绵田 土壤 重金属污染 生态风险 

分 类 号：S15[农业科学—土壤学]