土壤容重对溶质迁移过程的影响

土壤在径流作用下发生流失、土壤溶质迁移等现象,是一个受径流、土壤性质、下垫面特性、土地利用方式等多种因素综合影响的复杂过程.利用斜坡土槽,采用一定的坡度和实验流量,对不同容重的土样进行了室内放水实验,研究了在土壤饱和条件下,土壤容重对土壤溶质迁移过程的影响.实验结果表明:(1)随径流作用时间的增加,单位时间内土壤溶质迁移量逐渐减少,其关系可用幂函数来描述；(2)土壤溶质发生迁移是受地表径流和壤中流共同作用的结果；(3)土壤容重对土壤溶质迁移过程影响总体表现为土壤容重越大,随径流迁移的土壤溶质量越少；(4)土壤容重增加相同幅度,但同时刻随径流迁移的土壤溶质递减量逐渐减少.

Effect of Soil Bulk Density on Process of Soil Solute Transport

Loss of surface soil and soil solute transport induced by soil water erosion are parts of the complexprocess that is controlled by runoff,soil properties,land surface characteristics,land use and many otherfactors.In this study,a soil trench with a certain degree of slope and a certain rate of surface flow was setupin a laboratory to study the effects of different soil bulk densities on solute migration.The results showedthat during the soil erosion process,the rate of solute transport gradually reduced with time,which can bewell described by apower function.The migration of soil solute was affected by both runoff and subsurfaceflow at the same time.Less soil solute was migrated from the soil with greater soil density as described in apower function.