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Peatland GDGT records of Holocene climatic and biogeochemical responses to the Asian Monsoon
Zheng, Yanhong1,2; Li, Qiyuan1; Wang, Zhangzhang1; Naafs, B. David A.2; Yu, Xuefeng3; Pancost, Richard D.2
2015-10-01
发表期刊ORGANIC GEOCHEMISTRY
ISSN0146-6380
卷号87期号:2015页码:86-95
文章类型Article
摘要

Branched and isoprenoidal glycerol dialkyl glycerol tetraether (GDGT) membrane lipids have been widely used to reconstruct past climate and environmental change. They are not, however, widely applied to peat deposits and the controls on their distributions in peats remain unclear. Here, we present a high resolution record of branched and isoprenoid GDGT concentrations and distributions from a peat core from the Tibetan Plateau that spans the last 13 kyr, a period characterised by distinct dry and wet periods in the region. The lowest concentrations of total branched glycerol dialkyl glycerol tetraethers (brGDGTs) occurred during a presumably dry interval in the mid-Holocene, suggesting that brGDGTs-producing bacteria are less productive under such conditions, perhaps reflecting their putative anaerobic ecology. The mean annual air temperature (MAT) estimates derived from the methylation index of brGDGTs and cyclisation ratio of brGDGTs (MBT'/CBT) are higher than present mean annual temperature in the region and closer to summer temperatures, perhaps due to seasonal production of brGDGTs. The downcore distributions of isoprenoidal and branched GDGTs are dominated by GDGT-0 and brGDGT II, respectively. The high fractional abundances of GDGT-0 in warm and especially wet intervals suggest that these conditions are favourable for some groups of methanogenic archaea. The mid-Holocene dry interval is associated with an increase in the fractional and absolute abundance of crenarchaeol, which could be indicative of enhanced ammonia-oxidising archaeal-mediated nitrogen cycling under these conditions. Taken together, variations of GDGT concentrations in peats appear to document the response of microbial processes to climate change and variations in the biogeochemical environment. (C) 2015 Elsevier Ltd. All rights reserved.

关键词Peatland Gdgts Holocene Climate Asian Summer Monsoon Tibetan Plateau
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.orggeochem.2015.07.012
关键词[WOS]Tetraether Membrane-lipids ; Dialkyl Glycerol Tetraethers ; Ammonia-oxidizing Archaeon ; Moist Tropical Forest ; Soil Organic-carbon ; Hot-springs ; Tibetan Plateau ; Summer Monsoon ; Branched Gdgts ; Paleoclimate Reconstruction
收录类别SCI
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000360655100009
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9252
专题科技外事处
通讯作者Zheng, Yanhong
作者单位1.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
2.Univ Bristol, Cabot Inst, Sch Chem, Organ Geochem Unit, Bristol BS8 1TS, Avon, England
3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
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Zheng, Yanhong,Li, Qiyuan,Wang, Zhangzhang,et al. Peatland GDGT records of Holocene climatic and biogeochemical responses to the Asian Monsoon[J]. ORGANIC GEOCHEMISTRY,2015,87(2015):86-95.
APA Zheng, Yanhong,Li, Qiyuan,Wang, Zhangzhang,Naafs, B. David A.,Yu, Xuefeng,&Pancost, Richard D..(2015).Peatland GDGT records of Holocene climatic and biogeochemical responses to the Asian Monsoon.ORGANIC GEOCHEMISTRY,87(2015),86-95.
MLA Zheng, Yanhong,et al."Peatland GDGT records of Holocene climatic and biogeochemical responses to the Asian Monsoon".ORGANIC GEOCHEMISTRY 87.2015(2015):86-95.
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