Zhao, J. -B ， Luo, X. -Q ， Ma, Y. -D ， Zhou, Q ， Chen, B. -Q ， Yue, Y. -L
2018-05-01 null null 69(卷), null(期), (null页)
The scientific problems concerning Quaternary soil water content and the water cycle have not been researched. This study examined the soil water content and depth of distribution of gravitational water in the south Loess Plateau during development of the first palaeosol layer (S-1) by methods such as field investigation, electron microscopy, energy spectrum analysis, chemical analysis, and so on. The purpose was to reveal the climate, water balance and vegetation type at the time when S-1 developed. The depth of migration of CaCO3 and Sr were 4.2m below the upper boundary of the S-1 palaeosol, and the depth of weathered loess beneath the argillic horizon was 4.0m. Ferri-argillans developed well in the argillic horizon and their depth of migration was 1m below the argillic horizon. These findings suggest that the climate during the last interglacial was subtropical and humid, and the soil-water balance was positive. Gravitational water was present to a depth of least 4.2m from the top of S-1, and the water content was adequate for tree growth. The chemical weathering index showed that this palaeosol has been moderately weathered.
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