Soil Infiltration Characteristics of Purple Soil in Three Gorges Reservoir Area

Method of single-ring was employed to study soil water infiltration characteristics of Purple soil in Three Gorges reservoir area.The results showed that the soil stability infiltration rate of different land utilization types are from 0.0075~1.73 mm/min,and the order of bamboo forest land,preserved szechuan pickle land,citrus land,grassland;The simulating result of Horton infiltration equation in different land utilization types of Purple soil has reached a significant level results at α is 0.01,Horton infiltration equation can be expressed as soil water infiltration model of Purple soil in Three Gorges reservoir area.It has correlation between soil stability infiltration rate and soil physic-chemical properties,a power function between soil stability infiltration rate and sand,a exponentially function between soil stability infiltration rate and bulk gravity,a power function between soil stability infiltration rate and non-capillary porosity,a exponentially function between soil stability infiltration rate and content of water stable aggregate larger than 0.25 mm.Multiple log-linear regression model can be used as forecasting model of soil water infiltration characteristics parameters in purple soil.