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

作　　者：廖婉约 介冬梅 高桂在[1,2,3,4] 王江永 LIAO Wanyue;JIE Dongmei;GAO Guizai;WANG Jiangyong(School of Geographical Sciences,Northeast Normal University,Changchun 130024,Jilin,China;Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains,Ministry of Education,Changchun 130024,Jilin,China;Institute for Peat and Mire Research,State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Changchun 130024,Jilin,China;Institute of Grassland Science,Key Laboratory for Vegetation Ecology,Ministry of Education,Changchun 130024,Jilin,China;College of Geography and Remote Sensing Sciences,Xinjiang University,Urumqi 830017,Xinjiang,China)

机构地区：[1]东北师范大学地理科学学院,吉林长春130024 [2]长白山地理过程与生态安全教育部重点实验室,吉林长春130024 [3]国家环境保护湿地生态与植被恢复重点实验室,吉林长春130024 [4]植被生态科学教育部重点实验室,吉林长春130024 [5]新疆大学地理与遥感科学学院,新疆乌鲁木齐830017

出　　处：《干旱区地理》2024年第11期1876-1886,共11页Arid Land Geography

基　　金：国家自然科学基金面上项目(42271162);吉林省自然科学基金面上项目(20220101149JC);吉林省自然科学基金联合基金项目(2412021ZD005)资助。

摘　　要：科尔沁沙地生态环境脆弱,对气候变化反应敏感,明确沙地演化规律及其对气候变化的响应对于未来沙地保护和管理具有重要理论指导意义。以科尔沁沙地东北缘一处风沙古土壤剖面为研究对象,利用粒度、烧失量、植硅体指标系统重建了科尔沁沙地中晚全新世以来的气候变化和沙地演化。结果表明:5700~2400 cal a BP期间,科尔沁沙地经历了2次固定期和2次扩张期。第一次固定期为5700~4800 cal a BP,东亚夏季风强烈,气候温暖湿润,沙地大部分为固定沙丘;第一次扩张期为4800~3900 cal a BP,此时夏季风不断衰退,气候开始变得冷干,导致沙地逐渐扩张;第二次固定期为3900~3300 cal a BP,气候转暖湿,土壤发育,沙地面积减少;第二次扩张期为3300~2400 cal a BP,气候转冷干,沙地再次扩张,古土壤层普遍被风沙覆盖。总之,东亚夏季风驱动的气候变化驱动了科尔沁沙地中晚全新世沙地演化,沙地管理政策的制定需要特别关注未来气候变化趋势。The Horqin Sandy Land in Inner Mongolia,China,known for its ecological fragility and climate sensitivity,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 periphery 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 remained 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 

分 类 号：P534.632[天文地球—第四纪地质学] P467[天文地球—古生物学与地层学] P931.3[天文地球—地质学]