城市表层土壤磁化率与重金属含量分布的相关性研究  

Correlativity Study of the Distribution of Soil Magnetic Susceptibility and the Heavy Metal Contents in Xi'an City

作　　者：陈秀端[1,2] 卢新卫[1] 杨光[1] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710062 [2]陕西学前师范学院环境与资源管理系,西安710061

出　　处：《环境科学》2013年第3期1086-1093,共8页Environmental Science

基　　金：国家自然科学基金项目(41271510);中央高校基本科研业务费专项(2010ZYGX014;GK200901008);教育部新世纪优秀人才支持计划项目(NCET-05-0861)

摘　　要：以西安城市表层土壤为对象,测定表层土壤样品的磁化率和Co、Cr、Cu、Pb、Sn、Sr、Ba的含量,探讨表层土壤Co、Cr、Cu、Pb、Sn、Sr、Ba含量与磁化率的空间分布规律及二者的相关性.研究表明,西安城市表层土壤重金属含量与磁化率均具有中等程度的变异水平,所测7种重金属元素的平均含量均高于西安市主要土壤类型———褐土表层土壤背景值;土壤中Co、Cr、Cu、Pb、Sn、Sr、Ba的含量均与低频磁化率(χLF)呈显著正相关,而与频率磁化率(χFD)呈显著负相关;土壤低频磁化率的空间分布与重金属Pb、Cu的变化趋势相似,频率磁化率则与Co、Cr、Ba等元素的空间变化趋势相反.污染评价结果显示,西安市土壤重金属处于中度污染,污染负荷指数的空间变化与磁化率指标高度相关.因此土壤磁化率可作为研究城市土壤重金属污染的辅助手段.The magnetic susceptibility and the concentrations of Co, Cr, Cu, Pb, Sn, Sr and Ba in topsoil samples from Xi＇an City were measured to study their spatial distribution and their correlation in this study. The results show that the concentrations of all measured heavy metals are higher than their background values in Cinnamon topsoil, which is the main soil type of Xi＇an City. The heavy metals concentrations and the magnetic susceptibility of the studied samples display moderate variance. Co, Cr, Cu, Pb, Sn, Sr and Ba are significantly positively correlated with low-frequency magnetic susceptibility, while are significantly negatively correlated with frequency susceptibility. The spatial distribution of low-frequency magnetic susceptibility is identical with the concentrations of Pb and Cu. However, the spatial variation of frequency magnetic susceptibility is different from the concentrations of Co, Cr and Ba. The pollution assessment results show that the heavy metal pollution in topsoil of Xi＇an City is moderate. The spatial contribution of the pollution load index was significantly correlated with the magnetic susceptibility of topsoil in Xi＇an City. Therefore, soil magnetic susceptibility can be used as an effective monitoring means for heavy metal pollution in urban soil.

关 键 词：表层土壤 重金属 空间分布 磁化率 城市 

分 类 号：X53[环境科学与工程—环境工程]