郑州市郊土壤重金属的分布变异及来源

分析了郑州市郊区土壤的Cd、Hg、As、Pb、Cr含量,利用地统计学、多元分析和GIS作图等方法分析了郑州市郊区土壤重金属的分布变异和来源。结果表明:郑州市土壤重金属含量10余年来略有上升。土壤Hg、Cd含量分别在6300m和5500 m变程上有不同程度的空间相关性,但土壤Pb、Cr和As的空间变异则呈现较大的随机性。多元分析表明土壤Cd的空间分布主要体现了其自然背景值特征。土壤Cr变异受外源投入的影响较大,但一定程度上也受土壤自然背景因素控制。土壤Pb、As、Hg空间变异都主要受人类活动影响,其中土壤Hg空间变异受土地利用方式影响最明显。

Spatial Variation of Heavy Metals in Soils of Zhengzhou Surburb and Their Origin

The concentrations of Cd,Hg,As,Pb and Cd in soils of Zhengzhou suburb were analyzed,and their spatial variations and origin were characterized with the aid of geostatistics,principle component analysis and Geographic Information System.Results showed that in the past over 10 years,the concentrations of heavy metals in soil increased slightly.In the case of spatial distributions,Hg and Cd in soils exhibited strong and moderately spatial-dependence respectively within the range of 6300 m and 5500 m.However,the concentrations of Pb,Cr and As in soils exhibited no spatial-dependence.The distribution of soil Cd could be viewed as the reflection of its background values.The variation of Cr concentration in soils were influenced mainly by input from outside but also affected by natural background values.The spatial variations of Pb,As and Hg concentrations in soils were induced mainly by anthropogenic activities.Apparently amongst of them,that of Hg were attributed to the differences of land use type.