西藏土壤环境背景值的研究

RESEARCH ON THE ENVIRONMENTAL BACKGROUND VALUES OF SOILS IN XIZANG

The environmental background values of 13 elements of Hg,As,Se,Cr ,Mn,V,Pb, Cd,Zn,Cu,Ni,F and Co in Xizang soils are obtained through analyzing and determining 205 samples of surface soils in Xizang and the final data processing. The background val-ues of these elements are compared with those of the corresponding elements in the whole China,U. S. A and Alaska. It is found that the background values of major ele-ments in Xizang soils are higher than the average level of the whole China. The compari-son of background values between Alska and U. S. A shows a similar result. This is be-cause both Xizang and Alaska have a cold climate. Meanwhile, the factor correlation analysis of 13 elements in Xizang soils,organic matter,soil granularity and pH values of Xizang soils are carried out,and R-type cluster analysis is made for these 13 elements.