Topsoil sediment distribution along height above bare tillage land in agro-pastoral ecotone of northern foot of Yinshan Mountain

Based on the field sediment collection experiment by SCC-6 sediment collector and sediment particle composition in lab experiment in order to master the characteristics of wind erosion in agro-pastoral ecotone of northern foot of Yinshan Mountain, the sediment amount distribution along height above bare tillage land in the local was obtained, which revealed the variation of sediment amount and saltation particle composition. In addition, the sediment amount distribution along height and the relation between wind speed and sediment amount was conducted under some different wind forces in 0FDY-1.2 wind tunnel. The results showed that soil wind erosion was the near-surface wind-sand activity. The sediment particle saltates mainly in 7.5-43.5 cm. Wind sediment amount decreased along height, which correlate well with power function, exponent function and logarithm function. The sediment particle composition was influenced strongly by wind erosion intensity and topsoil characteristics. However, the regularity of sediment composition was distinct in a definite paticle size in different heights. Wind erosion amount increases with wind speed exponentially, which was influenced by times that the wind does. It will lay a soild foundation for searching the rules of soil wind erosion and puting forwards some effective measures against soil losses by wind in future.