The Research of Soil Infiltration Character Influence by Environmental Factor

With the method of double-rings,we studied the effect of different topographic condition(slope gradient,slope position,slope exposures) and rainfall on soil infiltration.The results indicated that infiltration rate display notable spatial variation,with the increasing of slope gradient,the soil infiltration rate decreased,it cost more time to reach the steady infiltration.But when the gradient is more than 20 degree,the steady infiltration present a hight value.The soil infiltration on the southern slope of mountain usually is higher than that on the northern slope of moutain in both watertsheds.On different slope position,it exhibited a tendency of lowing in soil infiltration rate with the drop of position.Before rain,both of the initial infiltration rate and steady infiltration rate are more than after rain,and it is easier to reach the steady infiltration.