• 责任者：Xu Zhiwei (Laboratory of Earth Surface Process and Environment ; School of Geographic and Oceanographic Sciences ; Nanjing University ; Nanjing 210093 ; China) ; Lu Huayu
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(2)
• 关键词：沙漠 ; deserts ; 内蒙古 ; Inner Mongolia
• 页码：p.218-227
• 图表：illus., 1 table, 65 refs.
• 分类号：1400
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

Relics of buried paleo-dune deposits and paleosols provide evidence for desert landscape evolution during Late Quaternary. Mu Us dune field located at semi-arid region of North China, near the northern limit of significant summer monsoon rainfall, is sensitive to climate changes. On the basis of extensive field investigations and previous studies in the Mu Us dune field,we found paleo-dunes and sand sheet layers interbedded within thick loess deposits in the loess-desert transition zone and northern Loess Plateau south and east to the dune field, indicating intensive dune migration to the south and east during arid and cold periods. Relics of paleosols are found distributed in the central and north dune field, implying enhanced vegetation and soil formation under relatively warm and wet climate conditions. 14 representative aeolian sequences were chosen for OSL dating to attempt to reconstruct spatial and temporal changes of the desert borders. Our preliminary results indicate that dunes migrated to the south and east into the Loess Plateau at around 26 - 16ka,with a maximum extension of about 30 -50kin relative to the present border, the area of mobile dunes extended at least 10000km2, accounting for about 25% of modern Mu Us dune field area. During Holocene Optimum（around 9 -5ka）,most of the mobile dunes in the dune field were stabilized by vegetation and soil. Spatial variations of Mu Us dune field during the Last Glacial Maximum and Holocene Optimum are interpreted as direct responses of the sand dune surface to climate changes.