腾格里沙漠表土磁化率的指示意义  

Significance of surface soil magnetic susceptibility in the Tengger Desert

作　　者：霍斌昱 郭本泓 刘成英 徐恒明 蒋宇强 HUO Binyu;GUO Benhong;LIU Chengying;XU Hengming;JIANG Yuqiang(School of Earth Sciences,Lanzhou University,Key of Laboratory Mineral Resources in Western China(Gansu Province),Lanzhou 730000,Gansu,China)

机构地区：[1]兰州大学地质科学与矿产资源学院,甘肃省西部矿产资源重点实验室,甘肃兰州730000

出　　处：《干旱区研究》2025年第4期613-621,共9页Arid Zone Research

基　　金：国家自然科学基金项目(42274100,42372208);第三次新疆综合科学考察项目(2023xjkk0100)。

摘　　要：解析磁化率指标在干旱区沉积物中的指示意义对理解干旱区过去降水历史和粉尘物源变化具有重要意义。然而,干旱区表土磁化率变化指示降水还是物源仍存争议。腾格里沙漠位于季风边缘区,已开展了丰富的物源工作,是研究沙漠表土磁化率指示意义的理想区域。本文采集了腾格里沙漠大范围表土和石羊河表层沉积物样品开展研究。结果显示:腾格里沙漠表土磁化率、百分比频率磁化率与降水相关性较低(R^(2)=0.01和R^(2)=0.02),不能指示降水变化。结合前人结果综合分析发现,沙漠表土磁化率的空间差异较大时,具有反映物源变化潜力;沙漠表土磁化率空间变化较小时,不能有效区分物源。在干旱区开展气候环境研究时,应用单一磁化率指标解释物源和环境变化时需充分考虑其多解性。The magnetic susceptibility of soils is crucial for paleoenvironmental and paleoclimatic studies.How-ever,debate persists regarding whether soil magnetic susceptibility can serve for paleoprecipitation reconstruction or reflects changes in prevenance in arid regions.To address this issue,new magnetic measurements were con-ducted on modern soil samples across the Tengger Desert,on the edge of the East Asian summer monsoon region.The weak correlation between the soil magnetic susceptibility,frequency-dependent susceptibility,and modern mean annual precipitation(R^(2)=0.01 and 0.02)suggests that precipitation is not the primary factor driving varia-tions in the surface soil magnetic susceptibility in the Tengger Desert.Conversely,distinct magnetic differences among arid regions indicate that soil magnetic susceptibility can differentiate between origin areas.These find-ings underscore the need for careful interpretation of soil magnetic susceptibility when conducting climate and en-vironmental research in arid regions.

关 键 词：磁化率 降水量 物源 腾格里沙漠 

分 类 号：P318.2[天文地球—固体地球物理学]