The spatial heterogeneity of soil physical properties in forests

Spatial heterogeneity is one of important properties in soil We use the principle and methods of geostatistics to study spatial heterogeneity of soil physical properties under old growth korean pine forests The results of semivariogram analysis show that there are high degrees of spatial heterogeneity in soil moisture,bulk density,capillary moisture capacity and porosity In 0～10 cm laryer,the scale of spatial heterogeneity is 11～13 m,and that is 6～8 m in 11～20 cm layer The degrees of spatial heterogeneity changes with this scales The nugget variance to sill ratio shows that spatial heterogeneity of autocorrelation in total spatial heterogeneity are 52 9%～73 7%(0～10 cm layer)and 69 3%～93 6%(11～20 cm layer)respectively,Both soil moisture and porosity have a stronger anisotropic structure in E 0° and N 90°directions,bulk density and capillary moisture capacity in the same directions are close to isotropy The semivariograms of these physical factors have a close relationships and effect on each others