FACTORS EFFECTING THE GEOCHEMICAL BACKGROUND CONTENTS OF HEAVY METALS IN DIFFERENT SOILS OF CHINA
土壤重金属地球化学背景值影响因素的研究

Forty six soil samples including drab soil, yellow brown earth, red earth, yellow earth, lateritic red earth, laterite and limestone soil developed from various parent material of granite, gneiss, gabbro, olivine-gabbro and limestone were collected from Beijing, Jinan, Nanjing, Guangzhou and Guangdong Province. The contents of Cu, Zn, Mn, Cr, Co, Ni, Pb and As were determined. Q mode factor analysis and two groups linear discriminant analysis were carried out and the results showed that the soil samples may be divided into two groups according to their parent material. The first group includes those developed from acidic rocks and can be subdivided into high- and low-lead granite soils. The soils with basic rocks as their parent material belong to the second group which can be further divided into soils developed from either igneous or sedimentary rocks. It is clear that the kinds of parent rock is a much more important factor effecting soil metal contents than the soil types.