【摘要】 通过野外小区试验,研究内蒙古砂土地区坡地土壤表层施用PAM、石膏及其混合物后对产流、产沙量的影响。试验结果表明,PAM对试验所用的砂土具有减小降雨入渗及减少土壤流失的作用,而施用石膏既可以增加水分入渗又可以减少土壤流失。施用PAM与石膏的混合物,在PAM用量为1 g/m2时,可以增加土壤水分入渗;在PAM用量为2 g/m2时,石膏用量大时入渗效果比较好,而在石膏用量为20 g/m2时,则不能起到增加水分入渗的作用。更多还原

【Abstract】 Field experiments were performed for study of the effects of polyacrylamide(PAM),gypsum and their mixtures used in soil surface on runoff and sediment yield.The results show that PAM may help to decrease rainfall infiltration and soil erosion,while the utilization of gypsum leads to the increase of rainfall infiltration and decrease of soil erosion.It is also indicated that the mixture of PAM and gypsum with the PAM content being 1g/m~2 can increase the rainfall infiltration,and that the mixture with high content of gypsum and PAM content being 2g/m~2 can obtain satisfactory result of rainfall infiltration,while the mixture with the gypsum content being 20g/m~2 does not have evident effects on the increase of rainfall infiltration.更多还原