新疆若羌县农田土壤重金属分布特征及污染评价  

Distribution characteristics and assessment for farmland soil heavy metals pollution in Ruoqiang County of Xinjiang

作　　者：曾妍妍[1,2] 周金龙 王松涛[3] 郑勇 

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052 [2]新疆水文水资源工程技术研究中心,乌鲁木齐830052 [3]新疆维吾尔自治区地质矿产勘查开发局第二水文工程地质大队,昌吉831100

出　　处：《干旱区资源与环境》2017年第9期87-91,共5页Journal of Arid Land Resources and Environment

基　　金：中央返还两权款资金项目(S15-1-LQ);新疆自治区水文学及水资源重点学科基金(xjswszyzdxk20101202)资助

摘　　要：文中在新疆若羌县154组农田土壤样品的8种重金属(Cr、Pb、Cd、Cu、Zn、Ni、As、Hg)测试数据的基础上,进行农田土壤重金属含量和空间分布特征分析,并采用单因子指数法和内梅罗综合指数法进行土壤重金属污染评价。结果表明:表层土壤中除Cr和Cd之外,其余重金属的平均含量均低于新疆土壤背景值,深层土壤中的8种重金属的平均含量均低于新疆土壤基准值,说明表层土壤受到轻度污染,深层土壤基本未受到污染,这与重金属污染评价结果一致;土壤中除Pb外,其余7种重金属均呈现含量随深度的增加而逐渐降低的趋势。采用相关性分析和因子分析进行农田表层土壤重金属来源分析,结果表明,Cr、Cd、Cu、Zn、Ni和As 6种重金属来源相似,主要来源于成土母质,而Pb和Hg主要为人为来源。Based on the testing data of eight heavy metals （Cr, Pb, Cd, Cu, Zn, Ni, As and Hg） in 154 farm- land soil samples collected from Ruoqiang County of Xinjiang, we analyzed the concentrations and distribution characteristics of heavy metals in farmland soil, and used the single factor index method and the Nemerow inte- grated index method to evaluate the soil heavy metals pollution. The results showed that the average concentra- tions of heavy metals except Cr and Cd were lower than soil background values of Xinjiang in topsoil, and the av- erage concentrations of heavy metals were all lower than soil reference values of Xinjiang in deep soil, indicating slight pollution in topsoil and non - pollution in deep soil, which was consistent with the evaluation results of heavy metals pollution. The results also showed that except Pb in soil, the heavy metals concentrations gradually decreased with the increasing depths. Correlation analysis and factor analysis were used to analyze heavy metals sources in farmland topsoil. Results showed that Cr, Cd, Cu, Zn, Ni and As had similar sources, mainly came from soil -forming parent material, while Pb and Hg were mainly associated with anthropogenic sources.

关 键 词：土壤重金属 分布特征 污染评价 来源 若羌县 

分 类 号：X53[环境科学与工程—环境工程]