State Key Laboratory of Earth Surface Processes and Resource Ecology, MOE Engineering Research Center of Desertification and Blown-Sand Control, No. 19 Xinjiekouwai Street, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, No. 19 Xinjiekouwai Street, Beijing 100875, China.
State Key Laboratory of Earth Surface Processes and Resource Ecology, MOE Engineering Research Center of Desertification and Blown-Sand Control, No. 19 Xinjiekouwai Street, Beijing 100875, China; Faculty of Geographical Science, Beijing Normal University, No. 19 Xinjiekouwai Street, Beijing 100875, China.
Sci Total Environ. 2018 Jun 15;627:586-599. doi: 10.1016/j.scitotenv.2018.01.270. Epub 2018 Feb 3.
To identify characteristics of aeolian activity and the aeolian environment in China's eastern desert region, this study collected surface sediment samples from the main desert and sandy lands in this region: the Hobq Desert and the Mu Us, Otindag, Horqin, and Hulunbuir sandy lands. We analyzed the grain-size characteristics and their relationships to three key environmental indicators: drift potential, the dune mobility index, and vegetation cover. The main sediment components are fine to medium sands, with poor (Hulunbuir) to moderate (all other areas) sorting, of unimodal to bimodal distribution. This suggests that improved sorting is accomplished by the loss of both relatively coarser and finer grains. Since 2000, China's eastern desert region has generally experienced low wind energy environmental conditions, resulting in decreased dune activity. In the Hobq Desert, however, the dry climate and sparse vegetation, in conjunction with the most widely distributed mobile dune area in the eastern desert region, have led to frequent and intense aeolian activity, including wind erosion, sand transport, and deposition, resulting in conditions for good sediment sorting. In the Mu Us, Otindag, and Horqin sandy lands, mosaic distribution has resulted from wind erosion-dominated and deposition-dominated aeolian environments. In the Hulunbuir Sandy Land, high precipitation, low temperatures, and steppe vegetation have resulted in well-developed soils; however, strong winds and flat terrain have created an aeolian environment dominated by wind erosion.
为了识别中国东部沙漠地区的风沙活动和风沙环境特征，本研究从该地区主要沙漠和沙地采集了表层沉积物样品：包括巴丹吉林沙漠和毛乌素沙地、浑善达克沙地、科尔沁沙地和呼伦贝尔沙地。我们分析了粒度特征及其与三个关键环境指标的关系：漂移潜力、沙丘移动指数和植被覆盖。主要的沉积物成分是细砂到中砂，分选性较差（呼伦贝尔）到中等（其他所有地区），呈单峰到双峰分布。这表明通过去除相对较粗和较细的颗粒来改善分选性。自 2000 年以来，中国东部沙漠地区的风能环境条件普遍较低，导致沙丘活动减少。然而，在巴丹吉林沙漠，干旱的气候和稀疏的植被，再加上该地区分布最广的活动沙丘区，导致频繁而强烈的风沙活动，包括风蚀、风沙搬运和沉积，从而形成了良好的沉积物分选条件。在毛乌素沙地、浑善达克沙地和科尔沁沙地，风沙环境以风蚀主导和沉积主导的镶嵌分布。在呼伦贝尔沙地，高降水、低温和草原植被导致了发育良好的土壤；然而，强风和平坦的地形创造了以风蚀为主导的风沙环境。
