浑善达克沙地春季风沙活动特征观测研究

 通过野外实验观测和室内分析整理的方法，对浑善达克沙地不同程度沙漠化土地的春季风沙活动特征进行了研究。结果表明：输沙率随风速增加成非线性增大；相同风速下，随着土地沙漠化程度的增加，输沙率成指数式增加；春季由于植被高度有限，覆盖度小于10%与覆盖度大于25%的沙地，对风场的响应，表现出明显不同的风沙流结构；不同程度的沙漠化土地上，发生风蚀搬运的物质组成也明显不同；研究区春季影响风沙活动的因素，主要是土地沙漠化程度，降水的迟早以及残存的灌木与多年生草本植物的多少等。

Characteristics of Blown Sand Activities in Hunshandake Sandy Land in Spring

The characteristics of blown sand activities on different degree desertified lands of Hunshandake Sandy Land were studied in this paper based on field observations and laboratory analyses.The results showed that sand transportation rate increased in nonlinear when wind velocity became gradually stronger;under the same wind conditions,sand transport rate increased in exponential function along desertified land degree increasing.Due to limit height of vegetation in spring,the correspondence of sandy desertification lands with the vegetation coverage less than 10% and more than 25% to wind profile presented obviously different sand-flow structure;at the same wind velocity,there were obviously different components in materials transported from different degree desertified lands.Different degree sandy desertification lands,rain time and the numbers of shrubs as well as herbaceous and others remained in study area were considered as the main factors affecting blown sand activity in spring.