AN INVESTIGATION ON THE SOIL TYPES AND THEIR VALUE ANALYSIS IN JIANFENGLING REGION,HAINAN ISLAND

According to the Chinese Soil Taxonomy Classification (the second edition),based on the 64 soil profiles data collected in Jianfengliug region,Hainan Island,selecting 5 diagnostic characteristics (OM,pH,BS,Al,ECEC) of the soils,using the methods of both principal component analysis and discriminatory analysis,the soil types were classified into 7 subgroups as follows: humic yellow soil,surface-gley yellow soil(belonging to yellow soil great group);typical lateritic yellow soil(belonging to lateritic yellow soil great group);humic latosol,moist latosol and rich-base latosol(belonging to latosol great group) and dry red earth great group.The total accuracy of discrimination is more than 75.6%.The equations were established through the principal component analysis.They defined the eigenvalues,delimitation index and the figure of the principal component scattering points with discriminatory boundaries of soil classification.The variation of the types both in the boundaries of soil classification and the characteristics of the soils are of significant difference.