干旱区地理2024，Vol.47Issue(11)：1876-1886,11.DOI:10.12118/j.issn.1000-6060.2024.003
中晚全新世科尔沁沙地气候变化及沙地演化研究
Climate change and desert evolution of Horqin Sandy Land in the mid-late Holocene
摘要
Abstract
The Horqin Sandy Land in Inner Mongolia,China,known for its ecological fragility and climate sensi-tivity,is highly responsive to climate change.This study aims to elucidate the evolutionary processes of the sandy terrain and its response to climatic variations,establishing a theoretical foundation for the future protection and management of sandy lands.The research focuses on an eolian paleosol profile situated on the northeastern pe-riphery of the Horqin Sandy Land.Through grain size analysis,loss on ignition,and phytolith analysis,the study reconstructs past climate changes and sandy land dynamics since the mid-Holocene.The results identify distinct phases of stability and expansion in the Horqin Sandy Land between 5700 and 2400 cal a BP,highlighting a strong correlation between eolian activity and climate fluctuations.From 5700 to 4800 cal a BP,the sandy land re-mained predominantly stable,coinciding with an intensified East Asian summer monsoon that fostered a warm and moist climate.This stability was followed by gradual expansion between 4800 and 3900 cal a BP,as the weakening summer monsoon led to colder and drier conditions that increased eolian activity and sandy land spread.The period from 3900 to 3300 cal a BP marked a return to stability and contraction,driven by a warmer and more humid climate conducive to soil development.However,from 3300 to 2400 cal a BP,colder and more arid conditions prompted renewed sandy land expansion,ultimately leading to the burial of the paleosol layer with sand.In summary,the evolution of the Horqin Sandy Land during the middle to late Holocene is closely linked to climate variations driven by the East Asian summer monsoon.These findings underscore the need for careful consideration of climate impacts in the development of policies for sandy land management.关键词
科尔沁沙地/气候变化/沙地演化/植硅体分析/粒度分析Key words
Horqin Sandy Land/climate change/desert evolution/phytolith anlysis/grain-size anlysis引用本文复制引用
廖婉约,介冬梅,高桂在,王江永..中晚全新世科尔沁沙地气候变化及沙地演化研究[J].干旱区地理,2024,47(11):1876-1886,11.基金项目
国家自然科学基金面上项目(42271162) （42271162）
吉林省自然科学基金面上项目(20220101149JC) （20220101149JC）
吉林省自然科学基金联合基金项目(2412021ZD005)资助 （2412021ZD005）
