干旱区地理2026，Vol.49Issue(9)：1765-1776,12.DOI:10.12118/j.issn.1000-6060.2025.745
柴达木盆地灌丛沙丘风沙沉积记录的气候环境演化
Climatic and environmental evolution recorded by aeolian sediments of nebkha in the Qaidam Basin
摘要
Abstract
Nebkhas are unique aeolian depositional landforms that contain a wealth of information about environ-mental evolution.They serve as valuable archives for paleoclimate studies in arid and semiarid regions.Taking a six-meter-high nebkha on the southern margin of the Qaidam Basin as the study subject,this research collected five optically stimulated luminescence samples and 61 sediment samples from its profile.By analyzing multiple parameters,including grain size,geochemical elements,chemical weathering indices,and nutrients,the study in-vestigated the evolution of the aeolian sedimentary environment during the Late Holocene on a centennial times-cale.The results showed that nebkha sedimentation in the study area primarily involved short-distance saltation and suspension.This process is influenced by changes in climate(dryness and wetness),variations in wind strength,and vegetation succession,resulting in a complex history alternately dominated by deposition and ero-sion.Since 3.91 ka,aeolian activity and climatic conditions in the study area have exhibited four distinct phases:(1)before 3.91 ka:a cold and dry climate with relatively weak aeolian activity.(2)3.91-2.85 ka:relatively warm and humid conditions with enhanced aeolian activity.(3)2.85-1.76 ka:frequent dry-humid fluctuations,with aeolian activity transitioning from weak to strong.(4)since 1.76 ka:a general trend toward a dry and cold climate.The depositional processes within nebkhas thus reflect the phased characteristics of Late Holocene cli-matic and environmental evolution in the Qaidam region,thus offering new sedimentary evidence for understand-ing regional aeolian environmental changes.关键词
灌丛沙丘/风沙沉积/气候演变/柴达木盆地Key words
nebkha/aeolian sediments/climatic evolution/Qaidam Basin引用本文复制引用
孙燕,南维鸽,胡光印,杨林海,胡菁菁,郝雪萌..柴达木盆地灌丛沙丘风沙沉积记录的气候环境演化[J].干旱区地理,2026,49(9):1765-1776,12.基金项目
国家自然科学基金项目(42171004,42271004) （42171004,42271004）
第二次青藏高原综合科学考察研究(2019QZKK0403)资助 （2019QZKK0403）
