金昌市城区绿化带土壤重金属含量特征及污染评价  

Features of concentrations and pollution assessments of the heavy metals in greenbelt soils in urban area,Jinchang,Gansu,China

作　　者：黄璜[1] 南忠仁[1] 刘晓文[1] 李媛[1] 丁海霞[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,兰州大学资源环境学院,兰州730000

出　　处：《干旱区资源与环境》2010年第2期187-191,共5页Journal of Arid Land Resources and Environment

基　　金：自然科学基金(NSFC40671167);国家环境保护公益性项目(NEPCP200809098)资助

摘　　要：通过对金昌城区主要交通干道周围绿化带土壤的取样调查,分析了Cu、Zn、Ni、Pb和Cd五种重金属元素含量分布的总体特征,并利用地积累指数法对绿化带土壤重金属进行污染评价。结果表明:五种重金属平均含量均超过了该地区的背景值,其中Cu和Ni含量最高,且具有明显的高度富集的特征。绿化带土壤中五种重金属变异系数均较大,其中Cu和Ni变异系数达到了125.06%和86.64%,属强变异性。地积累污染指数法的污染评价结果显示,Cu和Ni已分别构成4级和3级污染,且污染范围较广;而Zn和Pb均未构成污染,Cd构成了1级污染,但大部分样点中其含量均已超过了该地区的土壤背景值,表现出了明显的积累。In this study, soil samples were collected from the greenbelt soils along main streets in urban area, Jinchang city, in order to analyze the general features of selected metal concentrations. The geo - accumulation index was employed to assess the heavy metal pollution in studied area. Our findings showed that the concentra- tions of all five heavy metals exceeded their background levels, and the levels of metal Cu and Ni had the highest concentrations and showed remarkable accumulation in studied soils. The variation coefficients of five heavy metals were all in high levels in green belts soil, and those of element Cu and Ni reached up to 125.06% and 86. 64% , respectively, indicating that they were of strong variation. The results of pollution assessments showed that the degree of metal Cu and Ni pollution had already posed grade 4 and grade 3 in comparatively broad areas, respectively; while the ones of metal Zn and Pb pollution not, the one of Cd pollution grade 1, according to the standards of assessments. But the concentrations of the element Zn, Pb, and Cd exceeded their background levels.

关 键 词：金昌市 重金属 绿化带 地积累指数法 污染评价 

分 类 号：S153.61[农业科学—土壤学]