Distribution of glycerol ethers in Turpan soils: implications for use of GDGT-based proxies in hot and dry regions
Distribution of glycerol ethers in Turpan soils: implications for use of GDGT-based proxies in hot and dry regions
复制标题
吐鲁番土壤中甘油醚的分布：对在炎热和干燥地区使用基于 GDGT 的替代物的影响
DOI：
10.1007/s11707-018-0722-z
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发表时间：
2018-09
影响因子：
2
通讯作者：
Yang Huan
中科院分区：
文献类型：
--
作者：
Zang Jingjie;Lei Yanyan;Yang Huan
Proxies based on glycerol dialkyl glycerol tetraethers (GDGTs), a suite of membrane lipids occurring ubiquitously in soils, have generated increasing interest in quantitative paleo-environmental reconstruction. Hot and dry climates are likely to have occurred in the geological past; however, the limitations and applicability of these proxies to hot and dry environments are still unknown. In this study, we analyzed the GDGT distribution in the Turpan (TRP) basin of China, where the highest soil temperature can be approximately 70°C, and the mean annual precipitation (MAP) is 15.3 mm. We compared GDGT-based proxies among TRP soils, Nanyang (NY) soils, and Kunming (KM) soils; these three sites exhibit similar mean annual air temperature (MAAT) albeit contrasting temperature seasonality and MAP. Archaeal isoprenoidal GDGTs (isoGDGTs) dominate over bacterial branched GDGTs (brGDGTs) in most TRP soils; this is a characteristic GDGT distribution pattern for soils from dry regions globally. Another feature is the anomalously high GDGT-0/crenarchaeol ratio, which is generally attributed to the contribution of anaerobic methanogenic archaea by previous studies; however, these anaerobic archaea are unlikely to be highly abundant in the dry TRP soils, indicating that certain uncultured halophilic Euryarchaeota are likely to produce a significant amount of GDGT-0 that finally results in a high GDGT-0/Cren ratio. The changes in the salinity of the TRP soils appear to be an important factor affecting the MBT’5MEand the relative abundance of 6- vs. 5-methyl pentamethylated brGDGTs (IRIIa’). This is likely to introduce certain scatters in the correlations between MBT’5MEand MAAT and that between IRIIa’and pH determined at the global scale. A comparison of the MBT’5ME-inferred temperature between TRP, NY, and KM soils does not indicate a significant bias toward summer temperature, indicating that brGDGT paleothermometers in soils could reflect the MAAT.
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DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
T. Braak;F. Cateten;P. Šmilauer
通讯作者：
T. Braak;F. Cateten;P. Šmilauer
影响因子：
3
作者：
J. Weijers;Stefan Schouten;O. Spaargaren;J. Damsté
通讯作者：
J. Weijers;Stefan Schouten;O. Spaargaren;J. Damsté
影响因子：
11
作者：
Auguet, Jean-Christophe;Barberan, Albert;Casamayor, Emilio O.
通讯作者：
Casamayor, Emilio O.
影响因子：
3
作者：
Huan Yang;Xiaoxia Lü;Weihua Ding;Yanyan Lei;X. Dang;S. Xie
通讯作者：
Huan Yang;Xiaoxia Lü;Weihua Ding;Yanyan Lei;X. Dang;S. Xie
影响因子：
1.9
作者：
D. Willard;L. Weimer;W. Riegel
通讯作者：
D. Willard;L. Weimer;W. Riegel