Investigation on Maximum Spatial Variation Intervals of Heavy Metal Elements in Soils with Different Methods——Example from Shangyu City of Zhejiang Province

Heavy metal spatial variation in soils was studied in Shangyu City of Zhejiang Province with methods of geostatistics and global spatial autocorrelation.The results show that the method of spatial autocorrelation is more directly-viewing and stable than geostatistic method.But the precision of the spatial autocorrelation method depends on spatial intervals and the computational complexity is remarkably increased with decrease of the spatial intervals.Whereas,geostatistic method can not only get spatial variation intervals very quickly,but also can speculate the spatial variability degree.And more accurate results can be obtained by geostatistic method when fitting model is further optimized.