Study of the Effect of Soil Temperature on Soil Water Infiltration

In order to determine the effect of temperature on soil water infiltration parameters characteristics,the research about three typical soil(Shenmu Sand soil,Ansai Loess soil,Yangling Lou soil) has been carried out at the temperature of 18℃,25℃,27℃,30℃,35℃.the power function was used to fit the relationship between the wetting front distance and time.Also the cumulative depth of infiltration and infiltration rate can be fitted by using the Philip infiltration formula.The results show that:(1) The effect of temperature on the wetting front distance mainly through the parameter to realize,and the effect on infiltration rate mainly through affects the moisture absorption rate S;(2) With the temperature rising,the time to reach a certain depth of water infiltration between the same kind of soil will shorten,but it will be significantly differences among different texture of the soil;(3) With the temperature rising,the rate of wetting front transport and infiltration rate will increase.And the relationship between them with time and temperatures can be fitted by the complex power multi-function;(4) The wetting front transport rate and water infiltration rate of the same soil will change with the temperature change.The effect in the low temperature stage will be greater than that in the warmer stage.Based on this study,it will give some suggestion on Water Saving Irrigation in the Loess Plateau timely.