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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

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.

KeywordPeatland Gdgts Holocene Climate Asian Summer Monsoon Tibetan Plateau
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordTetraether Membrane-lipids ; Dialkyl Glycerol Tetraethers ; Ammonia-oxidizing Archaeon ; Moist Tropical Forest ; Soil Organic-carbon ; Hot-springs ; Tibetan Plateau ; Summer Monsoon ; Branched Gdgts ; Paleoclimate Reconstruction
Indexed BySCI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000360655100009
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Document Type期刊论文
Corresponding AuthorZheng, Yanhong
Affiliation1.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
Recommended Citation
GB/T 7714
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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