气候变化领域集成服务门户(CCPortal): Soil pH Dominates the Distributions of Both 5-and 6-Methyl Branched Tetraethers in Arid Regions

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DOI	10.1029/2019JG005356
	Soil pH Dominates the Distributions of Both 5-and 6-Methyl Branched Tetraethers in Arid Regions
	Duan, Yanwu; Sun, Qing; Werne, Josef P.; Yang, Huan; Jia, Jia; Wang, Leibin; Xie, Haichao; Chen, Fahu
通讯作者	Duan, YW (通讯作者)
发表日期	2020
ISSN	2169-8953
EISSN	2169-8961
卷号	125 期号:10
英文摘要	Branched glycerol dialkyl glycerol tetraether (brGDGT)-based indices are increasingly used for quantitative mean annual air temperature (MAAT) and soil pH reconstructions. However, large scatter in the relationship between the methylation index of 5-methyl brGDGTs (MBT '(5ME)) and MAAT still exists in arid and/or cold regions, and specific reasons for that offset remain unclear. Here, we present the brGDGT distributions from 18 soil samples along an altitudinal transect spanning a large gradient in MAAT at Mount (Mt.) Tienshan in arid central Asia, which we compare with previously published data from 256 globally distributed soils. Our results indicate that a dramatic increase of brGDGT concentrations occurs at 2,500 m above sea level for the soils from Mt. Tienshan, and a different pattern of brGDGT distributions in response to environmental changes appears below and above this elevation. Soil pH is observed to control the distributions of both 5- and 6-methyl brGDGTs in the soils from Mt. Tienshan and other arid regions. Importantly, we find that the fractional abundances of the 5-methyl isomers of pentamethylated and hexamethylated brGDGTs (IIa, IIIa) show a distinct negative correlation with soil pH, and the noncyclopentane-containing tetra-methylated brGDGT (Ia) is not related to MAAT in arid soils, which can explain the remaining temperature offset of reconstructed MAAT based on the MBT '(5ME) index in arid regions. In addition, our data suggest that either the brGDGT-producing community differs or brGDGT-producers respond differently to temperature in arid relative to moist soils.
关键词	DIALKYL GLYCEROL TETRAETHERS HOLOCENE MOISTURE EVOLUTION CENTRAL-ASIA ENVIRONMENTAL CONTROLS MONSOON PRECIPITATION SUMMER PRECIPITATION EXPERIMENTAL DROUGHT MEMBRANE-LIPIDS TIBETAN PLATEAU CARBON-DIOXIDE
英文关键词	soil pH; brGDGT distributions; MBT′ (5ME); microbial community
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:000586701500008
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259996
推荐引用方式 GB/T 7714	Duan, Yanwu,Sun, Qing,Werne, Josef P.,et al. Soil pH Dominates the Distributions of Both 5-and 6-Methyl Branched Tetraethers in Arid Regions[J]. 中国科学院青藏高原研究所,2020,125(10).
APA	Duan, Yanwu.,Sun, Qing.,Werne, Josef P..,Yang, Huan.,Jia, Jia.,...&Chen, Fahu.(2020).Soil pH Dominates the Distributions of Both 5-and 6-Methyl Branched Tetraethers in Arid Regions.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,125(10).
MLA	Duan, Yanwu,et al."Soil pH Dominates the Distributions of Both 5-and 6-Methyl Branched Tetraethers in Arid Regions".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 125.10(2020).