Comparison of interpolation methods for content of soil available phosphor Mapping monthly precipitation for Tibetan Plateau with GIS and multivariate analysis based on DEM data Spatial Variability of Soil DNA in China Fir and Masson Pine Mixed Forest in Three Gorger Reservoir Areas Comparison of spatial interpolation methods for daily meteorological elements. Spatial analysis of species diversity in the tropical vegetations along the vertical belt at Bawangling Nature Reserve,Hainan Island