基于CSLE的泛第三极地区土壤侵蚀强度空间分布特征OA北大核心CSTPCD

[Objective]The aims of this study are to quantify soil erosion and analyze its distribution pattern in the Pan-Third Pole region,and to provide scientific basis for soil erosion control in this region.[Methods]Based on a stratified systematic design with unequal probabilities,a total of 31 406 sampling units were selected.The Chinese Soil Loss Equation(CSLE)was employed to calculate the soil erosion rate.The Moran's index(Ⅰ)was used to characterize its spatial distribution in the Pan-Third Pole region.[Results](1)The mean soil erosion rate was 162.73 t/(km2·a)in the Pan-Third Pole region,and the proportion of the soil loss area was 7.75％.The areas with the soil erosion rate exceeding 500 t/(km2·a)mainly distributed in West Asia,East Asia and South Asia.(2)Soil erosion was highly aggregated in the study region.The value of Moran's I was up to 0.920 9.The spatial aggregation manifested as high-high and low-low aggregations,and the former was observed primarily in northern West Asia,northern and southwestern South Asia,as well as northeastern China,Loess Plateau,and southern Tibet.(3)Soil erosion was relatively more serious in the grassland,scrubland and arable land.Especially in the grassland with the altitude≥1 000 m,scrubland and arable land above 500 m,the percentage of the soil loss area exceeded 25％,and the mean soil erosion rate ranged from 426.85 to 683.72 t/(km2·a).[Conclusion]In the Pan-Third Pole region,the grassland with the altitude between 1 000 and 6 000 m,scrubland between 500 and 4 000 m and arable land from 1 000 to 4 000 m were judged as the key areas susceptible to soil erosion,which requires the special attention.