Capability of Soil Water Infiltration of Purple Soil in Hilly Area of Central Sichuan

The soil water infiltration process of purple soil and soil infiltration performance under different land use were studied by using the method of core sampler.Influences of soil bulk density,slope,slope aspect on soil infiltration were analyzed.The Chenjiawan watershed of Yanting County in Sichuan Province was chosen as a study area.The results indicated that the rate of soil water infiltration of purple soil decreased with the increase of infiltration time initially,and came into stable situation after 25~30 minutes.The Horton Empirical formula coud simulate the process of soil water infiltration properly.The soil stable infiltration rates changed with different slope aspect as following: semi-shady slope semi-sunny slopesunny slope.The soil bulk density was negatively correlated with soil infiltration rates,the soil infiltration rates decreased as soil bulk density increased.Under different land use types,infiltration of farmland was bigger than that of forestry land.