干旱区生态环境知识资源中心(Arid): Distribution of glycerol ethers in Turpan soils: implications for use of GDGT-based proxies in hot and dry regions

Arid

	Distribution of glycerol ethers in Turpan soils: implications for use of GDGT-based proxies in hot and dry regions
	Zang Jingjie; Lei Yanyan; Yang Huan
来源期刊	Frontiers of Earth Science
ISSN	2095-0195
出版年	2018
卷号	12 期号:4 页码:862-876
英文摘要	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'5ME and the relative abundance of 6- vs. 5-methyl pentamethylated brGDGTs (IRIIa'). This is likely to introduce certain scatters in the correlations between MBT'5ME and 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.
英文关键词	GDGTs Turpan soils semi-arid and arid areas salinity MBT'5ME
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:6407059
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336056
作者单位	Zang Jingjie, (Wuhan)School of Earth Sciences, China University of Geosciences, State Key Laboratory of Biogeology and Environmental Geology, Wuhan, Hubei 430074, China.; Yang Huan, (Wuhan)School of Earth Sciences, China University of Geosciences, State Key Laboratory of Biogeology and Environmental Geology, Wuhan, Hubei 430074, China.; Lei Yanyan, Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, 15260, USA.
推荐引用方式 GB/T 7714	Zang Jingjie,Lei Yanyan,Yang Huan. Distribution of glycerol ethers in Turpan soils: implications for use of GDGT-based proxies in hot and dry regions[J],2018,12(4):862-876.
APA	Zang Jingjie,Lei Yanyan,&Yang Huan.(2018).Distribution of glycerol ethers in Turpan soils: implications for use of GDGT-based proxies in hot and dry regions.Frontiers of Earth Science,12(4),862-876.
MLA	Zang Jingjie,et al."Distribution of glycerol ethers in Turpan soils: implications for use of GDGT-based proxies in hot and dry regions".Frontiers of Earth Science 12.4(2018):862-876.