Effect of Different Land Use Type of Soil Porosity Characteristics at Dry-hot Valley of Yuanmou

The soil bulk density,soil total capillary,capillary porosity and non-capillary porosity of 5 different land use types in 0~100 cm soil profile were studied.The results showed that the soil bulk density increased with the increasing of soil depth in 0~100 cm soil profiles of 5 different land use types,but the change patterns of soil total capillary and non-capillary porosity were on the contrary.The soil capillary porosity was higher and it mainly depending on soil texture of dry-hot valley.The results suggested that the distribution differences of soil bulk density,soil total capillary,capillary porosity and non-capillary porosity in soil profile caused by the different land use types at dry-hot valley.