末次盛冰期以来库布齐沙漠环境变化

中国北方季风边缘区沙漠/沙地如何响应气候变化及其反馈研究对于理解干旱半干旱地区现代地表过程及其未来环境演变趋势有重要的科学意义.库布齐沙漠作为中国北方季风边缘区中东部唯一的以流动、半流动为主的沙漠,现代地表景观与周围沙地(如毛乌素沙地、浑善达克沙地、科尔沁沙地等)明显不同.晚第四纪以来库布齐沙漠与季风边缘区中东部沙地环...

Environment changes in the Hobq Desert since the Last Glacial Maximum

How the deserts/sandy lands in the monsoonal margin region in northern China responds to climate change and its feedback are of important scientific significance for understanding the modern surface processes in arid and semi-arid regions and their future environmental evolution trends. The Hobq Desert is the only mobile and semi-mobile desert in the middle and east of the monsoonal margin region in northern China. The modern surface landscape is significantly different from the surrounding sandy lands （such as the Mu Us Sandy Land， the Hunshandake Sandy Land， and the Horqin Sandy Land）. There are still many disputes about whether the Hobq Desert has the same evolution process as the sandy lands in the middle and east of the monsoonal margin region and when its wet period occurs since the Late Quaternary. The conclusions of regional aeolian deposition and lacustrine deposition records are obviously different， and there is a difference between the optimal period of humidity in the middle and late Holocene and the early and middle Holocene. Through the process of the probability density distribution （Probability Density Function， PDF） of the aeolian sedimentary age-lithology of the Hobq Desert and its comparison with paleoenvironment records of aeolian deposition and lacustrine deposition from the surrounding sandy lands， it is found that： the environment evolution process of the Hobq Desert is generally consistent with that of sandy lands in the middle and east of the monsoonal margin region since the Last Glacial Maximum. During 27.6-10 ka and the Late Holocene （2-0 ka）， sand activity was strong and the climate was relatively arid； in the early Holocene （10-6 ka）， paleosols began to develop， sand dunes were gradually fixed， humidity increased， and environmental conditions were improved； in the Middle Holocene （6-2 ka）， paleosols developed extensively， sand dunes were fixed， and climate was obviously humid. The process of regional environmental evolution is controlled by both solar insolation in low-latitude and variations of ice volume in high-latitude.