150 ka以来中国沙土带千年尺度沙地进退演化

IF 6.6 1区 农林科学 Q1 SOIL SCIENCE
Lixing Zhang, Dapeng Yue, Jingbo Zhao, Xiaoning Wang, Yueshan Liu, Lili Yang
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引用次数: 0

摘要

了解风沙活动的演变和沙漠/沙区环境的变化,对于阐明风沙活动的发生机制和促进生态恢复具有重要意义。虽然中国黄土-黄土带的黄土和湖泊记录证据表明东亚冬季风在沙尘暴活动中的作用,但这些记录不能明确划分沙尘暴的强度等级和物质成分的变化,也不能解释沙尘暴活动的机制。本研究利用晶粒尺寸、磁化率(MS)和SiO2/Al2O3比值分析,以及晶粒尺寸端元(EM)模型、分形维数(Dv)和基于MS的古降水重建来阐明这些方面。4个粒径端元(EMs)显示,细粒主要来自西风和土壤作用,而粗粒主要来自EAWM。根据毛乌素沙地东南缘LHG剖面风蚀活动强度的变化,将风蚀活动强度划分为3个等级,这是毛乌素沙地东南缘LHG剖面强烈风蚀的主要标志。自150ka以来,经历了3次主要的砂土膨胀期和3次固定或收缩期。除低潮前期转为典型的沙漠环境,年平均降水量(MAP)为164.49 mm外,基本为沙质环境。沙漠/沙的演变受湿度、植被和风场条件的制约。这些因子由太阳日照和冰盖动力学共同驱动,并同步记录冰期-间冰期和千年尺度的振荡。这些发现有助于提高我们对区域生态环境变化和风害监测与预防的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolution of millennial-scale sandy land’s advance and retreat in the Chinese sand-loess belt since 150 ka
Understanding the evolution of aeolian activities and the changes in desert/sand environments is crucial for clarifying their occurrence mechanisms and promoting ecological restoration. Although evidence from loess and lake records in the Chinese sand-loess belt has shown the role of the East Asian winter monsoon (EAWM) in duststorm activities, these records can’t clearly divide the intensity grades and shifts in material components nor explain the mechanism. This study used grain size, magnetic susceptibility (MS), and the SiO2/Al2O3 ratio analyses, along with the grain size end-member (EM) model, fractal dimension (Dv), and MS-based paleo-precipitation reconstruction to clarify these aspects. Four grain size end-members (EMs) revealed that fine grains were predominantly derived from westerly wind and pedogenesis, while the EAWM primarily transported coarse grains. We classified aeolian activity intensity into three grades based on changes in the proportion of sand, which were the main signs of intense wind erosion in the LHG profile located in the southeastern margin of the Mu Us Sandy Land (MUSL). Since 150 ka, there have been three major episodes of sand expansion and three fixed or shrinking intervals. It was mostly a sand environment, except during the early L1F phase when it became a typical desert environment with mean annual precipitation (MAP) of 164.49 mm. Desert/sand evolution was constrained by moisture, vegetation, and wind field conditions. These factors were driven jointly by solar insolation and ice sheet dynamics, and synchronized recorded glacial-interglacial and millennial-scale oscillations. The findings help improve our knowledge of regional ecological environment changes and aeolian disaster monitoring and prevention.
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来源期刊
Geoderma
Geoderma 农林科学-土壤科学
CiteScore
11.80
自引率
6.60%
发文量
597
审稿时长
58 days
期刊介绍: Geoderma - the global journal of soil science - welcomes authors, readers and soil research from all parts of the world, encourages worldwide soil studies, and embraces all aspects of soil science and its associated pedagogy. The journal particularly welcomes interdisciplinary work focusing on dynamic soil processes and functions across space and time.
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