摘要
选取内蒙古河套平原东部的托克托地区作为研究对象,以1 564个表层土壤样品的测试数据为基础数据,基于GeoExp l多元地学数据空间数据管理与分析系统,对土壤中重金属元素(Cd、Hg、As、Cu、Pb、Cr、Zn、N i)含量进行系统描述统计及空间分布分析,区内这几种重金属元素中Hg变异系数最大,Pb变异系数最小;8种重金属元素的高含量区主要集中在研究区西北部的农田和居民用地区。在此分析基础上,采用模糊综合评价法对土壤重金属污染等级进行评价,其评价结果为一级,即研究区内的表层土壤大部分暂未受重金属污染;但区内大黑河流域重金属含量较高,容易受重金属污染,结合其地表覆盖情况,推断此处土壤重金属元素的高含量与人类农田灌溉、化肥及农药的使用有关。
Hetao Plain is a typical kind of irrigated agriculture area in Inner Mongolia.This study focused on the Tuoketuo area located in the eastern part of Hetao Plain.Totally 1,564 samples of the surface soil were analyzed based on the GeoExpl system,and eight heavy metal elements including Cd,Hg,As,Cu,Pb,Cr,Zn and Ni in the top soil were analyzed.Among these heavy metal elements,the maximum of variable index is Hg and the minimum of it is Pb.The high concentration of these heavy metal elements has been found in the northwestern part of the study area.Based on these data,a fuzzy comprehensive assessment is carried out.The results can reasonably reflect the region＇s soil quality.The paper concludes that the soil in the Tuoketuo area is not contaminated by heavy metals while it is high in some area,especially along the Heihe River area.Irrigation and the improper usage of pesticides and chemical fertilizers containing heavy metals are considered to be the cause of the heavy metal contamination in the soil.
出处
《现代地质》
CAS
CSCD
北大核心
2009年第2期365-371,共7页
Geoscience
基金
内蒙古自治区人民政府与中国地质调查局合作项目(1212010511210)
关键词
土壤重金属
模糊综合评价
内蒙古托克托地区
heavy metal contamination
fuzzy comprehensive assessment
Tuoketuo area in Inner Mongolia
