葫芦岛市连山区、龙港区土壤重金属空间分布及污染评价

本文利用地理信息系统及地统计学,对葫芦岛市连山区和龙港区土壤中重金属的污染状况进行了空间变异性分析,对Cd、Cu、Zn污染进行单因子评价。结果表明:土壤Cd、Cu、Zn的理论模型均为球状模型。Cu的C0/(C0+C)为26%,说明Cu体现为中等的空间相关性,Cd、Zn的C0/(C0+C)分别为0.3%、3.2%,说明这2种重金属体现为强烈的空间相关性。在已有监测数据的基础上,制作了该地区土壤Cd、Cu、Zn污染的预测表面,得到研究区土壤重金属的分布图及污染分布图。研究表明,龙港区和杨杖子矿区的土壤已达到了重度污染的水平,不再适合于农业生产。

Spatial Distribution of Soil Heavy Metals and Population Evaluation in Lianshan Country and Longgang Country ,Huludao City

Geographical information system(GIS) combined with Geostatistics was applied to reveal the contamination distribution and spatial variability of soil heavy metal in Lianshan country and Longgang country.Cadmium,copper and zinc pollution was evaluated by the single factor based on the monitoring datas.The results showed that theoretical semivariogram models of soil Cd,Cu,Zn were best described with a spherical model.The ratio of nugget to sill of Cu was 26%,indicating that the spatial correlation of Cu was moderately dependent.The ratios of nugget to sill of Cd,Zn were 0.3% and 3.2%,respectively,indicating that the spatial correlation of the two heavy metals was strongly dependent.From the spatial distribution map of soil we could get the contamination index in the region,which indicating that the soil of Longgang country and Yangzhangzi had been contaminated strongly and is on longer suitable for agricultural production.