荒漠绿洲下垫面粒度特征与供尘关系的研究

Research on Grain Characteristics of Falling Dust and Different Surfaces and Their Relationships on Oasis

研究以野外观测为主要手段,分析了不同高度大气降尘与不同下垫面沙粒的粒度特征及二者间的关系。结果表明:近地表0.1 m处收集到的沙尘物质主要来自于近地表跃移的沙粒,随着高度的增加,降尘中细沙成分越来越少,粉沙成分越来越大。不同下垫面粒度特征与扬沙起尘关系密切,其粒度特征可反映下垫面向大气提供沙尘的程度。

The grain characteristic of falling dust and different height surface and their relationship were analyzed by the field observation data. The results are as follows： the falling sand-dust of 0. 1 m height near surface is mainly from saltation matter, the fine sand compositions of falling dust are fewer and the powder sand elements are more. The relationships between the grain characteristics of surface and the sand dust storm are obvious, and the grain characteristics can reflect the degree of affording sand-dust from surface.