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Dependence of the cyclization of branched tetraethers on soil moisture in alkaline soils from arid-subhumid China: implications for palaeorainfall reconstructions on the Chinese Loess Plateau
Wang, H (Wang, H.)[ 1,2 ]; Liu, W (Liu, W.)[ 1,3 ]; Zhang, CL (Zhang, C. L.)[ 4 ]
2014
Source PublicationBIOGEOSCIENCES
Volume11Issue:23Pages:6755-6768
Subtype期刊论文
Abstract

The use of branched glycerol dialkyl glycerol tetraethers (bGDGTs) in loess-palaeosol sequences (LPSs) has shown promises in continental palaeotemperature reconstructions. Thus far, however, little is known about the effect of soil moisture on their distributions in the water-limited Chinese Loess Plateau (CLP). In this study, the relationships between environmental variables and the cyclization of branched tetraethers (CBT) were investigated in arid-subhumid China using 97 surface soils in the CLP and its vicinity, as well as 78 soils with pH >7 which have been previously published. We find that CBT correlates best with soil water content (SWC) or mean annual precipitation (MAP) for the overall data set. This indicates that CBT is mainly controlled by soil moisture instead of soil pH in alkaline soils from arid-subhumid regions, where water availability is a limiting factor for the producers of bGDGTs. Therefore, we suggest that CBT can potentially be used as a palaeorainfall proxy on the alkaline CLP. According to the preliminary CBT-MAP relationship for modern CLP soils (CBT = -0.0021 x MAP + 1.7, n = 37, r = -0.93), palaeorainfall history was reconstructed from three LPSs (Yuanbao, Lantian, and Mangshan) with published bGDGT data spanning the past 70 ka. The CBT-derived MAP records of the three sites consistently show precession-driven variation resembling the monsoon record based on speleothem delta O-18, supporting CBT as a reasonable proxy for palaeorainfall reconstruction in LPS. The direct application of CBT as a palaeorainfall proxy in corroboration with the bGDGT-based temperature proxy may enable us to further assess the temperature/hydrological association for palaeoclimate studies on the CLP.

DOI10.5194/bg-11-6755-2014
Indexed BySCIE
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9798
Collection加速器质谱中心
Corresponding AuthorLiu, W (Liu, W.)[ 1,3 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an, 710075, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
4.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Recommended Citation
GB/T 7714
Wang, H ,Liu, W ,Zhang, CL . Dependence of the cyclization of branched tetraethers on soil moisture in alkaline soils from arid-subhumid China: implications for palaeorainfall reconstructions on the Chinese Loess Plateau[J]. BIOGEOSCIENCES,2014,11(23):6755-6768.
APA Wang, H ,Liu, W ,&Zhang, CL .(2014).Dependence of the cyclization of branched tetraethers on soil moisture in alkaline soils from arid-subhumid China: implications for palaeorainfall reconstructions on the Chinese Loess Plateau.BIOGEOSCIENCES,11(23),6755-6768.
MLA Wang, H ,et al."Dependence of the cyclization of branched tetraethers on soil moisture in alkaline soils from arid-subhumid China: implications for palaeorainfall reconstructions on the Chinese Loess Plateau".BIOGEOSCIENCES 11.23(2014):6755-6768.
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