黄土高原第四纪古气候变化对黄土古土壤序列渗透性的影响,Earth Surface Processes and Landforms

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黄土高原第四纪古气候变化对黄土古土壤序列渗透性的影响
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-01-24 , DOI: 10.1002/esp.4779
Kai Hou _{1,

2} , Hui Qian _{1,

2} , Qiying Zhang _{1,

2} , Tao Lin _{1,

2} , Yao Chen _{1,

2} , Yuting Zhang _{1,

2} , Wengang Qu _{1,

2}

Affiliation

仍然知之甚少的多周期黄土—古土壤风沙沉积物的渗透率差异有可能极大地增进我们对第四纪冰期—冰间期的气候变化的理解。在这项研究中，研究了南Jing阳高原一个保存完好的连续黄土古土壤的渗透率。利用一系列气候指标推断风化强度，包括粒度分布，磁化率和矿物学。实验室测试结果表明，黄土层的平均饱和导水率高于古土壤层。同样，在垂直和水平饱和水力传导率的深度变化方面，黄土和古土壤之间也存在明显的差异。黄土-古土壤在其他受成岩风化作用的影响方面也存在差异（即粘土含量，砂含量，Kd值（粗粉土与粘土的比率），磁化率，白云石含量以及角闪石/伊利石和角闪石/绿泥石的比率）。。我们的研究结果表明，在寒冷/干燥的古气候条件下，冰川期的黄土层具有较高的渗透性，并具有弱的成岩作用。相反，在间冰期，在温暖/潮湿的气候中发育的古土壤层经历了强烈的成岩作用，导致渗透率降低。基于这些结果，我们构建了第四纪气候变化理论与现代水文系统之间的联系。这为调查当地地下水资源的分布和污染提供了科学依据。

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Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Permeability differences in multi‐cycle loess–paleosol aeolian sediments, which are still poorly understood, have the potential to significantly improve our understanding of climatic change during the glacial–interglacial periods of the Quaternary. In this study, the permeability of a well‐preserved and continuous loess–paleosol sequence in the South Jingyang Plateau was investigated. Weathering intensity was inferred using a series of climate proxies including grain‐size distribution, magnetic susceptibility and mineralogy. The results of laboratory tests showed that the average saturated hydraulic conductivity of loess layers is higher than that of paleosol layers. Also, clear differences between loess and paleosol were found in terms of depth variations of the vertical and horizontal saturated hydraulic conductivities. Differences in loess–paleosol were also found for other proxies for pedogenic weathering [i.e. clay content, sand content, Kd value (ratio of coarse silt to clay), magnetic susceptibility, dolomite content and the ratios of hornblende/illite and hornblende/chlorite]. Our results showed a high permeability of loess layers associated with weak pedogenic weathering during cold/dry paleoclimatic conditions in glacial stages. On the contrary, paleosol layers developed in a warm/humid climate during the interglacial stages experienced strong pedogenic weathering that resulted in lower permeability. Based on these results, we construct a connection between Quaternary climate change theory and the modern hydrological system. This provides a scientific basis for investigating the distribution and pollution of groundwater resources in the local region. © 2020 John Wiley & Sons, Ltd.

更新日期：2020-01-24

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