Abstract：[Background] The ecological environment of Bashang Plateau and northern mountainous region in North China is fragile and soil erosion is serious, which potentially threatens the ecological security and sustainable development of this region and surrounding areas. The purpose of this study is to improve the understanding of soil erosion dynamic in the study area, and to provide scientific basis for comprehensive land management and improvement of soil and water conservation measures in the region.[Methods] We selected meteorological data, NDVI data sets and geo-related data from 1998 to 2015, and applied the USLE, RWEQ model and trend analysis to study the soil erosion dynamics in the region and its influencing factors of spatiotemporal distribution and change trends.[Results] 1) The distribution of soil erosion in the study area changed from wind erosion to water erosion from northwest to southeast. During 1998-2015, water erosion decreased significantly. Although wind erosion increased somewhat since 2008, the overall trend decreased and only a small part of the study area was intensified. 2) Soil and topography reflected the spatial differences for soil erosion. The northwest part in the study area is flat with high elevation, while southeast part is undulating with multi-gradient slope factor and its main soil types with relatively high soil erodibility. 3) Rainfall erosivity and wind force were the important driving factors for soil erosion, with strong spatiotemporal differences. Rainfall erosivity generally increased from 1998 to 2015, while overall trend of weather factor showed a slight downward trend. During the period from 1998 to 2015, fraction vegetation cover increased significantly.[Conclusions] With the increase of fraction vegetation cover, the overall soil erosion gradually decreases, and the vegetation restoration project in the sandstorm source area of Beijing and Tianjin plays an important role.
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2021, Vol. 19 
