Assessment and analysis of the freeze-thaw erosion sensitivity on the Tibetan Plateau
WANG Liyan;XIAO Yi;JIANG Ling;OUYANG Zhiyun;State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences;University of Chinese Academy of Sciences;
Following the water erosion and wind erosion,freeze-thaw erosion is the third strong soil erosion in China. The Tibetan Plateau is a severe freeze-thaw erosion area owing to its high altitude,strong radiation and low temperature. Five indices are chosen to assess freeze-thaw erosion. They are annual range of temperature,annual precipitation,slope,slope aspect and vegetation coverage. The results show:( 1) The distribution of freeze-thaw erosion is very extensive in the Tibetan Plateau,with the freeze-thaw erosion area of 149. 02 × 10~4km~2,accounting for 62. 20% of the total area of the Tibetan Plateau. Freeze-thaw erosion sensitive area is56. 80 × 10~4 km~2,among which moderate and more sensitive area is 27. 39 × 10~4 km~2,accounting for 48. 22% of the total freeze-thaw erosion sensitive area in the Tibetan Plateau;( 2) The regional differentiation of freeze-thaw erosion sensitivity is obvious. Different intensities of freeze-thaw erosion sensitivity appear in different regions.The sensitivity is heavy in south and southeast of the plateau,Karakoram Mountains,Qilian Mountains,and Hengduan Mountains.