中文摘要：

对巴音温都尔沙漠的表层土壤进行的粒度分析及风蚀量估算结果表明，巴音温都尔沙漠属就地起沙，从丘间低地、沙丘基部到沙丘顶部，平均粒径逐渐变细，分选情况逐渐变好；未沙化土地的平均粒径最细，分选较差。偏度是流动沙丘表层土壤全部为正偏，未沙化土地为负偏。在沙丘不同部位正偏程度也不同，沙丘顶部表现为极正偏，偏度在此出现最大值。未沙化土地、丘间低地及沙丘基部均呈多峰态，而沙丘顶部则呈典型的双峰态。在成沙过程中，每成1g沙最多要耗土9．56g，损失掉的土壤以小于0．25mm的细粒物质居多，表明土地在沙漠化过程中损失的土壤是形成沙尘暴的主要尘源。

英文摘要：

The Bayinwenduer desert is one of the five large deserts in Inner Mongolia, China. So far, there are no system researches on the formation causes of this desert. This paper has analyzed grain sizes distribution and estimated desertification process loss on Bayinwenduer desert. The grain sizes distribution has measured with sieve method and analyzed with traditional sizing assay method. The sizing parameter has been calculated with Folk and Ward graphing method and the cumulative frequency curve features has been explained with Visher graph. The loss during desertification process has been estimated with the size comparison analysis method of the content ratio changing between erosional grain and un-erosional grain. The specific thought of paper is to make an analogy on the percentage composition of different position and different size between the dune and the non-desertificated land. Generally speaking, the bigger of the value, the more of the soil loss. If the biggest soil loss quantity has been calculated, the others positions of the dune can be determined. too. Sothis paper uses the biggest ratio to estimate the loss of the soil during desertification process. Results show that the sand of the desert is from the local place. From intervale, proximal of dune and top of dune, the mean grain sizes become finer and finer but the size sorting become better. The soil of the non-desertificated land has finest grain and worse sorting. Skewness of surface soil of mobile is positive while that of the surrounding non-desertificated land is negative. There are different skewnesses at different places and the top of dune shows the largest positive skewness. The non-desertificated land, the intervale and the proximal of dune have showed multimodality, meanwhile, the top of dune has showed two-humped. During the desertification process, the forming of 1 g sand causes 9.56 g soil loss and the lost soils are mainly fine particle of which grain diameter is less than 0.25 mm, which indicates that the lost soil during the proces