干旱区研究2025，Vol.42Issue(9)：1671-1680,10.DOI:10.13866/j.azr.2025.09.11
巴丹吉林沙漠周边沉积物粒度空间分异与粉尘释放源区识别
Spatial variations in sediment size serve as a basis for the identification of dust emission source areas around the Badain Jaran Desert
摘要
Abstract
To elucidate the sediment grain size characteristics and identify potential dust emission sources in the regions of the Badain Jaran Desert,110 surface(0-2 cm)and subsurface(10-20 cm)sediment samples from sev-en typical areas(Wentugaole Gobi,Alatengaobao Gobi,Yabulai Gobi,Alatengchaoke Gobi,Dingxin-Dongfeng Gobi,Gurinai Dry Lake,and Juyanhai Dry Lake)surrounding the desert were collected in August 2023.Sieving and laser particle size analyses were combined to analyze the grain composition.A sediment erosion-deposition model was used to quantify the potential erosion-deposition and emission rates of PM10.The findings are summa-rized as follows.(1)Surface sediments exhibited triple peaking distributions dominated by fine sand(2-3 Φ),fine gravel(-3--1 Φ),and very fine silt(8-9 Φ)due to the superimposition of hydraulic processes and eolian ero-sion.The subsurface layers had quadruple peaking distributions with an additional coarse silt particle peak.The fraction of sand(58.23％-84.60％)in the surface layers significantly exceeded that in the subsurface layers(30.87％-81.20％)as the sand content increased,while the proportions of gravel,silt,and clay declined from the Dingxin-Dongfeng Gobi to the Yabrai Gobi.(2)The surface fine-particle loss in the Dingxin-Dongfeng Gobi and Gurinai Dry lakes was the most pronounced,with the highest values in the potential erosion-deposition rates(7.82％)and emission rates of PM10(4.01％).In contrast,Yabulai Gobi exhibited the lowest values(0.15％and 0.02％for those traits,respectively.(3)The dry lake areas were dominated by fine-grained deposits from the lake,whereas the Gobi regions were influenced by alluvial-proluvial processes that lacked sorting.The Dingxin-Dong-feng Gobi,a high-wind-energy zone,exhibited surface coarsening due to the high intensity of spatially heteroge-neous eolian erosion.In summary,the Dingxin-Dongfeng Gobi and Gurinai Dry lakes were considered the prima-ry potential dust emission sources around the Badain Jaran Desert.Moreover,land conservation in these areas is critical for regional sand control and dust transport between regions.关键词
粒度特征/粉尘释放潜力/潜在蚀积率/沉积环境/巴丹吉林沙漠Key words
grain size characteristics/dust emission potential/potential erosion-deposition rate/sedimentary en-vironment/Badain Jaran Desert引用本文复制引用
刘军,左合君,王海兵,张雪,廖承贤..巴丹吉林沙漠周边沉积物粒度空间分异与粉尘释放源区识别[J].干旱区研究,2025,42(9):1671-1680,10.基金项目
国家自然科学基金项目(42261002,41861001) （42261002,41861001）
内蒙古农业大学实验教学仪器设备研制与标本制作项目(YZ2024013) （YZ2024013）
