【摘要】 [目的]冻融作用是黑土区的主要自然现象之一。研究黑土区冻融作用对侵蚀沟发育的影响,以便防止冻融侵蚀,保护黑土资源。[方法]采取室内试验与野外定点定位观测相结合方法,开展冻融作用对黑土物理性状、冻胀量以及侵蚀沟岸冻裂融塌的试验观测。[结果]冻融作用使土壤水分增加,容重减小,孔隙度增大,土壤团聚体总量降低,冻胀量加大。[结论]冻融作用导致土壤抗蚀能力降低,是加剧侵蚀沟发育的主要影响因素之一。更多还原

【Abstract】 [Objective]Freezing and thawing is one of the major natural phenomena in the black soil area.The effects of freezing and thawing cycling on eroded gully development were studied to prevent freezing and thawing erosion,and then protect the black soil resources.[Methods]The soil physical properties,variation of soil body and gully bank were measured during freezing and thawing process by field measurements and laboratory simulations.[Results]Freezing and thawing cycling increased soil moisture,porosity and frost heaving amount,and the bulk density and the content of soil aggregate were reduced.[Conclusion]Freezing and thawing cycling results in the decrease of soil erosion resistance,it is the main factor leading to an aggravation of erosion gully development.更多还原