Effect of Quaternary climatic change on modern hydrological systems in the southern Chinese Loess Plateau
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- 作者：Jingbo Zhao ; Yandong Ma ; Junji Cao ; Junping Wei…
- 关键词：Loess ; Chang’an county ; Permeability ; Aquifer and aquifuge ; Pleistocene climate
- 刊名：Environmental Earth Sciences
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：73
- 期：3
- 页码：1161-1167
- 全文大小：820 KB
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文摘
A systematic study was conducted to investigate the permeability, porosity, grain size, water content, mass percentage of carbonate, and magnetic susceptibility of representative Middle Pleistocene loess-palaeosol layers (from L1 to S5) on the Chinese Loess Plateau. The average infiltration rate of the loess (0.93?mm/min) was higher than the palaeosol (0.62?mm/min), and the porosity of loess was higher than that of palaeosol. The loess layers have greater water-bearing capacity and, therefore, they are more likely to form aquifers while the palaeosol layers are more prone to form aquitards. The greater permeability and the larger water-bearing space of the loess layers are largely the result of lower intensity pedogenesis due to the colder/drier climatic conditions at the time these sediments were deposited. Conversely, the weaker permeability and lesser water-bearing capacity of the palaeosol layers can be explained by the greater pedogenesis during the warmer/wetter climatic conditions. The studies demonstrate a compelling relationship between Pleistocene climate and modern hydrological systems in the southern Chinese Loess Plateau.