Effects of different rotational tillage patterns on soil physical properties and yield of winter wheat-spring maize rotation field in Weibei highland Soil aggregate stability and erodibility under forest vegetation in the Loess Plateau using the Le Bissonnais method Dual effect of fruit tree cultivation on soil physical characteristics Review of researches on soil aggregate and soil organic carbon Effects of lucerne-crop rotation patterns on soil aggregate stabilityand soil organic carbon Effects of land abandonment on soil aggregate and organic carbon stability in cold waterlogged paddy fields