新疆若羌县农田土壤重金属分布特征及污染评价

发布时间：2018-01-01 22:17

本文关键词：新疆若羌县农田土壤重金属分布特征及污染评价　出处：《干旱区资源与环境》2017年09期 　论文类型：期刊论文

【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。
[Abstract]:The paper is based on the data of 8 heavy metals (CrPbPbCU, Cuznzhizhuashiu) from 154 groups of farmland soil samples in Ruoqiang County, Xinjiang. The content and spatial distribution of heavy metals in farmland soil were analyzed, and the pollution of heavy metals in soil was evaluated by single factor index method and Nemero comprehensive index method. The results showed that the surface soil was in addition to Cr and CD. The average content of other heavy metals was lower than that of Xinjiang soil background value, and the average content of 8 heavy metals in deep soil was lower than Xinjiang soil benchmark value, indicating that the surface soil was slightly polluted. The deep soil was basically unpolluted, which was consistent with the assessment results of heavy metal pollution. With the exception of Pb, the contents of the other seven heavy metals decreased gradually with the increase of soil depth. Correlation analysis and factor analysis were used to analyze the source of heavy metals in the topsoil of farmland. Six kinds of heavy metals, such as Cr, CD, Cu, Zn, Zn, Ni and as, are mainly derived from the parent material of soil, while Pb and Hg are the main sources of human being.
【作者单位】：新疆农业大学水利与土木工程学院;新疆水文水资源工程技术研究中心;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;
【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
【分类号】：X53;X825
【正文快照】： 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)重金属在土壤中具有隐蔽性、滞后性、累积性和不可逆转性,极难被治理[1]。土壤中的重金属会由雨水淋滤及地表径流作用转移进入地表水系统,进而通过地表水和地下水的交互作用污染地下水体,最终对人类饮用

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