Abstract: The research was about the effects on soil physical properties of forages and crops in the agro pastoral transitional zone of North China.The result were:the profitable effects of forages on soil physical properties such as soil bulk density, water content, total porosity and total number of >0.25mm aggregates are greater than those of wheat.In the 0-20cm soil layer, the solely sowing pasture which has the smallest soil bulk density, the biggest soil total porosity and total number of >0.25mm aggregates is wheatgrass pasture.The mixed sowing pasture with smooth bromegrass+wheatgrass has the smallest soil bulk density and the biggest total porosity and water content in all kinds of mixed sowing pastures.

Key words: Soil, Physical properties, Forages and crops

摘要： 农牧研究交错带地区退耕还草对土壤物理性状的影响。结果表明,与小麦比较牧草对土壤容重、含水量、孔隙度和团聚体等土壤物理性状的改善作用非常明显。0-20cm土层,单播草地以冰草土壤容重最小,孔隙度和>0.25mm团聚体总数最大,而混播草地则以无芒雀草+冰草的土壤容重最小,而孔隙度和含水量最大。

关键词: 土壤, 物理性状, 退耕还草