Spatial variability of heavy metals in soil of Three-Gorges Reservior in Chongqing

The spatial variability of heavy metals in soil of Three-Gorges Reservior in Chongqing was studied. The results show that the Hg and Cr of soil heavy metal are distributed lognormally. The semivariogram models of Hg and Cr are power and spherical. These observed items are correlated in a given spatial range. The kriging method is applied to estimate the unobserved points and their group maps are obtained. The spatial variabilities of the heavy metals in Chongqing can be reflected clearly in the maps.