RESEARCHES ON SOIL ENVIRONMENTAL BACKGROUND VALUES IN TIBET

Key words: 
• Tibet /
• background values /
• soil /
• R-type of cluster analysis

Abstract: The environmental background values of 13 elements of Hg, As, Se, Cr,Mn, V, Ph, Cd, Zn, Cu, Ni, F and Co in xizang soils are obtained through analyzing and determining 205 samples of surface soils in Tibet and the final data processing. The background values 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 elements in Tibet soils are higher than the average level of the whole China. The comparison of background values between Alska and U.S.A. shows a similar result. This is because both Tibet and Alaska have a cold climate. Meanwhile, the factor correlation analysis of 13 elements in Tibet soils, organic matter, soil granularity and pH values of Tibet soils are carried out, and R-type cluster analysis is made for these 13 elements.