Effect of Soil Antecedent Water Content on Soil Water Movement and Transport on Loess Slope Land

According to the results of simulation rainfall experiments,the transport traits of soil water on loess slope lands with different soil antecedent water content,1.3%,5.7%,9.7%,14.2% and 18.9%,respectively,are investigated.It shows that the initiation runoff time climbs with an increase in soil antecedent water content.The mean coefficient of surface runoff presents a linearity relation with soil antecedent water content,while the mean sediment content of surface runoff shows a parabola relation with it,with the lest amount of 9.7% land.The more the soil antecedent water content is,the more the accumulative infiltration amount,and the less percent of runoff translating into soil are.To promote the rare rainfall infiltration and lessen the water and soil loss,protective farming measures are suggested in rainy season.