东北地区土壤风蚀敏感性分区研究OA

[Objective]To further understand the regionalization of soil wind erosion sensitivity in Northeast China.[Method]The wind erosion-sensitive areas of Northeast China were divided during the spring(March—May)from 1990 to 2020 by selecting five key factors,including the number of erosive wind days,vegetation coverage,topography,soil erodibility,and humidity.Based on the analytic hierarchy process(AHP)and the comprehensive sensitivity assessment index,the regional differences in the distribution of wind erosion sensitivity levels in the Northeast China were revealed.Additionally,combined with the dominant wind direction in spring,the transport law of wind-eroded sand and dust were preliminarily explored.[Results]The Northeast China is a major grain-producing area in China,affected by monsoon currents in spring,and the surface soil has low water content,making it prone to wind erosion.The spatial distribution of wind erosion sensitivity was consistent with the number of erosive wind days.Specifically,the extremely sensitive and highly sensitive areas to wind erosion were mainly distributed in the lower reaches of the West Liaohe River,Xilingol,western Hulunbuir,and the Songliao Plain,accounting for 48.61%of the study area.[Conclusion]The land use types in extremely sensitive and highly sensitive areas were dominated by grassland and dry land,respectively.By spatially overlaying the wind direction with the map of soil wind erosion-sensitive areas.The spring dust in Northeast China may mainly originate from The eastern part of the Inner Mongolia Autonomous Region and the Mongolia.