Influence of Topographic Factors on Soil Water and Bulk Density in A Typical Slope Land in the Black Soil Area of Northeast China

A typical slope land with black soil in Guangrong small watershed of Northeast China was taken as the study area.Soil water content and bulk density were measured from soil samples.Spatial analysis,classic statistics,and geostatisitcs were used to explore the effects of topographic factors on soil water and bulk density.Results show that slope has the first significant influence on soil water and bulk density and the correlations are significantly negative.Elevation and slope position have significant effects on soil water and slope aspect has no significant influence on soil water and bulk density.Result from geostatistics analysis demonstrates that soil water and bulk density have a median spatial heterogeneity and a strong spatial heterogeneity,respectively.Slope has the more important effect on soil water and bulk density than others and plays an important role in the control of soil and water loss in the study area.