Palaeoclimatic and hydrological environments inferred by moisture indexes from the S-4 palaeosol section in the Xi'an region, China
Zhao, JB (Zhao, Jing-Bo)[ 1,2 ]; Ma, YD (Ma, Yan-Dong)[ 2,3 ]; Lui, R (Lui, Rui)[ 4 ]; Luo, XQ (Luo, Xiao-Qing)[ 1 ]; Shao, TJ (Shao, Tian-Jie)[ 1 ]
2018-11-10
发表期刊QUATERNARY INTERNATIONAL
卷号493页码:127-136
文章类型期刊论文
摘要

We used indexes of soil moisture content to reconstruct water balance and vegetation type during the development of the palaeosol S4 of the loess-palaeosol sequence in the Xi'an area of China. Goethite–Fe-Mn concretions were found within S4 from field survey and laboratory analyses, and their presence is used as an indicator of soil moisture content and the depth distribution of groundwater. From a comparison of the goethite–Fe-Mn concretions, weathered-leached loess layer, and the vertical migration distance of CaCO3 between various sections in the Xi'an region, we infer a subtropical climate with annual average temperature 15–16 °C and annual average precipitation of 900–1000 mm during the development of S4. At that time, unlike today, the Qinling Mountains were not the boundary between subtropical and temperate climatic regions. Our results show that the depth distribution of soil gravitational water in the Xi'an region reached 3.3 m; the average soil moisture content within the 0–3.3 m depth range was ∼25%, after water consumption by evapotranspiration; and the soil moisture content within the goethite–Fe-Mn concretion layer was close to saturation, at ∼48%. Soil moisture was abundant and the water balance was positive and a large amount of moisture was supplied to the groundwater each year, which was conducive for the development of forest vegetation.

关键词S4 Palaeosol Goethite–fe-mn Concretion Palaeo-moisture Content Indexes Palaeowater Circulation Water Balance
DOI10.1016/j.quaint.2018.06.015
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9580
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Ma, YD (Ma, Yan-Dong)[ 2,3 ]
作者单位1.School of Geography and Tourism, Shaanxi Normal University, Xi'an 710062, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China;
3.Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region (Chang'an University), Ministry of Education, Xi'an 710054, China;
4.Department of Basic, Engineering University of PAP, Xi'an 710076, China
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Zhao, JB ,Ma, YD ,Lui, R ,et al. Palaeoclimatic and hydrological environments inferred by moisture indexes from the S-4 palaeosol section in the Xi'an region, China[J]. QUATERNARY INTERNATIONAL,2018,493:127-136.
APA Zhao, JB ,Ma, YD ,Lui, R ,Luo, XQ ,&Shao, TJ .(2018).Palaeoclimatic and hydrological environments inferred by moisture indexes from the S-4 palaeosol section in the Xi'an region, China.QUATERNARY INTERNATIONAL,493,127-136.
MLA Zhao, JB ,et al."Palaeoclimatic and hydrological environments inferred by moisture indexes from the S-4 palaeosol section in the Xi'an region, China".QUATERNARY INTERNATIONAL 493(2018):127-136.
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