Arid
DOI10.1016/j.gca.2016.06.004
Evidence of moisture control on the methylation of branched glycerol dialkyl glycerol tetraethers in semi-arid and arid soils
Dang, Xinyue1; Yang, Huan1; Naafs, B. David A.2,3; Pancost, Richard D.2,3; Xie, Shucheng1
通讯作者Xie, Shucheng
来源期刊GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
EISSN1872-9533
出版年2016
卷号189页码:24-36
英文摘要

The distribution of bacterial branched glycerol dialkyl glycerol tetraethers (brGDGTs) is influenced by growth temperature and pH. This results in the widespread application of the brGDGT-based MBT(’)/CBT proxy (MBT - methylation of branched tetraethers, CBT - cyclization of branched tetraethers) in terrestrial paleo-environmental reconstructions. Recently, it was shown that the amount of precipitation could also have an impact on CBT, as well as the abundance of brGDGTs relative to that of archaeal isoprenoidal (iso)GDGTs (R-i/b) and the absolute abundance of brGDGTs, potentially complicating the use of MBT/CBT as paleothermometer. However, the full influence of hydrology, and in particular soil water content (SWC), on GDGT distributions remains unclear. Here we investigated variations in the GDGT distribution across a SWC gradient (0-61%) around Qinghai Lake in the Tibetan Plateau, an arid to semiarid region in China. Our results demonstrate that SWC affects the brGDGT distribution. In particular, we show that SWC has a clear impact on the degree of methylation of C6-methylated brGDGTs, whereas C5-methylated brGDGTs are more impacted by temperature. This results in a combined SWC and temperature control on MBT’. In this context we propose a diagnostic parameter, the IR6ME (relative abundance of C6-methylated GDGTs) index, to evaluate the applicability of brGDGT-based paleotemperature reconstructions. Using the global dataset, expanded with our own data, MBT’ has a significant correlation with mean annual air temperature when IR6ME < 0.5, allowing for the use of MBT’/CBT as temperature proxy. However, MBT’ has a significant correlation with mean annual precipitation (i.e., a substantial reflection of SWC impact) when IR6ME > 0.5, implying that MBT’ may respond to hydrological change in these regions and can be used as a proxy for MAP. (C) 2016 Elsevier Ltd. All rights reserved.


英文关键词Soil water content MBT C6-methylated brGDGTs Precipitation Semi-arid and arid region
类型Article
语种英语
国家Peoples R China ; England
收录类别SCI-E
WOS记录号WOS:000380753100002
WOS关键词PAST ENVIRONMENTAL-CONDITIONS ; CHINESE LOESS PLATEAU ; WATER-CONTENT ; MEMBRANE-LIPIDS ; QUANTITATIVE INDICATORS ; COMMUNITY STRUCTURE ; PARTICULATE MATTER ; TIBETAN PLATEAU ; RECONSTRUCTION ; TEMPERATURE
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193170
作者单位1.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China;
2.Univ Bristol, Bristol Biogeochem Res Ctr, Organ Geochem Unit, Bristol BS8 1TS, Avon, England;
3.Univ Bristol, Cabot Inst, Sch Chem, Bristol BS8 1TS, Avon, England
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GB/T 7714
Dang, Xinyue,Yang, Huan,Naafs, B. David A.,et al. Evidence of moisture control on the methylation of branched glycerol dialkyl glycerol tetraethers in semi-arid and arid soils[J],2016,189:24-36.
APA Dang, Xinyue,Yang, Huan,Naafs, B. David A.,Pancost, Richard D.,&Xie, Shucheng.(2016).Evidence of moisture control on the methylation of branched glycerol dialkyl glycerol tetraethers in semi-arid and arid soils.GEOCHIMICA ET COSMOCHIMICA ACTA,189,24-36.
MLA Dang, Xinyue,et al."Evidence of moisture control on the methylation of branched glycerol dialkyl glycerol tetraethers in semi-arid and arid soils".GEOCHIMICA ET COSMOCHIMICA ACTA 189(2016):24-36.
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