中文摘要：

在这研究，在 Horqin 沙的陆地区域上的沙跳跃和灰尘排放上的土壤潮湿的效果被调查，基于在 2010 的三个灰尘事件的观察。开始表面粒子的运动的最小的磨擦速度，也就是阀值磨擦速度，被估计是 0.34， 0.40，和 0.50 m s < 啜 class= “ a-plus-plus ” > 在干燥、干燥、湿的土壤下面的 1 分别地调节。在在干燥、干燥的土壤下面的灰尘事件期间与观察比较调节，灰尘排放流动在湿事件期间是更小的，但是沙粒子的跳跃活动(d 50 m ) 更强壮。在空中的灰尘粒子的尺寸分布(0.1 d 20 m ) 表演更好的灰尘粒子的集中(0.1 d 0.3 m ) 在干燥土壤条件下面有一座第二等的山峰，当他们在湿土壤条件下面是不在的时。这建议表面土壤粒子尺寸分发能被土壤潮湿改变。在湿土壤条件下面，粒子看起来有一种更大的尺寸，和因此更潜在的 saltating 粒子是可得到的。这解释在湿土壤条件下面观察的更强壮的跳跃过程的出现。

英文摘要：

In this study, the eff ects of soil moisture on sand saltation and dust emission over the Horqin Sandy Land area are investigated, based on observations of three dust events in 2010. The minimum friction velocity initiating the motion of surface particles, namely, the threshold friction velocity, is estimated to be 0.34, 0.40, and 0.50 m s？1 under the very dry, dry, and wet soil conditions, respectively. In comparison with the observations during the dust events under the very dry and dry soil conditions, the dust emission fl ux during the wet event is smaller, but the saltation activities of sand particles （d≧50 μm） are stronger. The size distributions of airborne dust particles （0.1≦d≦20 μm） show that concentrations of the fi ner dust particles （0.1≦d≦0.3 μm） have a secondary peak under dry soil conditions, while they are absent under wet soil conditions. This suggests that the surface soil particle size distribution can be changed by soil moisture. Under wet soil conditions, the particles appear to have a larger size, and hence more potential saltating particles are available. This explains the occurrence of stronger saltation processes observed under wet soil conditions.