| Correlations between microbial tetraether lipids and environmental variables in Chinese soils: Optimizing the paleo-reconstructions in semi-arid and arid regions | |
| Yang, Huan1,2,3; Pancost, Richard D.2,3; Dang, Xinyue1; Zhou, Xinying4; Evershed, Richard P.2,3; Xiao, Guoqiao1; Tang, Changyan1; Gao, Li5; Guo, Zhengtang6; Xie, Shucheng1; Xie, SC (reprint author), China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China. | |
| 2014-02-01 | |
| 发表期刊 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| ISSN | 0016-7037 |
| 卷号 | 126期号:0页码:49-69 |
| 文章类型 | Article |
| 摘要 | The bacterial membrane lipid-based continental paleothermometer, the MBT/CBT or MBT'-CBT proxy (methylation index of branched tetraethers/cyclization of branched tetraethers), results in a large temperature deviation when applied in semiarid and arid regions. Here we propose new calibration models based on the investigation of >100 surface soils across a large climatic gradient, with a particular focus on semiarid and arid regions of China, and apply them to a loess-paleosol sequence. As reported elsewhere, MBT values exhibit a much higher correlation with MAAT than with summer temperature, suggesting a minimal seasonality bias; however, MBT is apparently insensitive to temperature <5 degrees C or >20 degrees C. Additional complexities are apparent in alkaline and arid soils, which are characterized by different relationships to climatic parameters than those in the complete Chinese (or global) dataset. For example, MBT and CBT indices exhibit a negative correlation in alkaline and arid soils, in contrast to their positive correlation in acid soils. Moreover, the cyclization ratio of bGDGTs (CBT), previously defined as a proxy for soil pH, is apparently primarily controlled by MAAT in these alkaline soils. Thus, we propose (1) a local Chinese calibration of the MBT-CBT proxy and (2) an alternative temperature proxy for use in semiarid and arid regions based on the fractional abundances of bGDGTs; the latter has a markedly higher determination factor and lower root mean square error in alkaline soils than the Chinese local calibration and is suggested to be preferred for paleotemperature reconstruction in Chinese loess/paleosol sequences. These new bGDGT proxies have been applied to the Weinan Holocene paleosol section of the Chinese Loess Plateau (CLP). The fractional abundance calibration, when applied in the Weinan Holocene paleosol, produces a total Holocene temperature variation of 5.2 degrees C and a temperature for the topmost sample that is consistent with the modern temperature. Previously, we showed that the ratio of archaeal isoprenoid GDGTs to bGDGTs (R-i/b) increases at MAP <600 mm, and elevated R-i/b values (>0.5) in the CLP suggest the presence of enhanced aridity in the late Holocene in North China. In combination, the high R-i/b ratios (>0.5) and the associated low MBT values (<0.4) reveal the co-occurrence of dry and cold events, especially in the latest Holocene, in the loess-paleosol sequences in CLP, and probably also in cold and arid regions outside of CLP. (C) 2013 Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 关键词[WOS] | DIALKYL GLYCEROL TETRAETHERS ; IONIZATION-MASS-SPECTROMETRY ; AMMONIA-OXIDIZING ARCHAEON ; HOLOCENE ASIAN MONSOON ; AFRICAN LAKE-SEDIMENTS ; LOESS PLATEAU ; MEMBRANE-LIPIDS ; EAST-ASIA ; QUANTITATIVE INDICATORS ; TEX86 PALEOTHERMOMETRY |
| 收录类别 | SCI |
| 语种 | 英语 |
| 项目资助者 | National Basic Research Program of China [2011CB808800]; Natural Science Foundation of China [40930210, 41130207, 41330103]; 111 Project [B08030] |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000329504800004 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/5186 |
| 专题 | 古人类及旧石器研究室 |
| 通讯作者 | Xie, SC (reprint author), China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China. |
| 作者单位 | 1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China 2.Univ Bristol, Organ Geochem Unit, Bristol Biogeochem Res Ctr, Bristol BS8 1TS, Avon, England 3.Univ Bristol, Cabot Inst, Sch Chem, Bristol BS8 1TS, Avon, England 4.Chinese Acad Sci, Lab Human Evolut, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 5.Brown Univ, Dept Geol Sci, Providence, RI 02912 USA 6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Huan,Pancost, Richard D.,Dang, Xinyue,et al. Correlations between microbial tetraether lipids and environmental variables in Chinese soils: Optimizing the paleo-reconstructions in semi-arid and arid regions[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2014,126(0):49-69. |
| APA | Yang, Huan.,Pancost, Richard D..,Dang, Xinyue.,Zhou, Xinying.,Evershed, Richard P..,...&Xie, SC .(2014).Correlations between microbial tetraether lipids and environmental variables in Chinese soils: Optimizing the paleo-reconstructions in semi-arid and arid regions.GEOCHIMICA ET COSMOCHIMICA ACTA,126(0),49-69. |
| MLA | Yang, Huan,et al."Correlations between microbial tetraether lipids and environmental variables in Chinese soils: Optimizing the paleo-reconstructions in semi-arid and arid regions".GEOCHIMICA ET COSMOCHIMICA ACTA 126.0(2014):49-69. |
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