气候变化领域集成服务门户(CCPortal): Global calibration of a novel, branched GDGT-based soil pH proxy

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DOI	10.1016/j.orggeochem.2015.10.005
	Global calibration of a novel, branched GDGT-based soil pH proxy
	Xiao, Wenjie; Xu, Yunping; Ding, Su; Wang, Yinghui; Zhang, Xinyu; Yang, Huan; Wang, Guoan; Hou, Juzhi
通讯作者	Xu, YP (通讯作者)
发表日期	2015
ISSN	0146-6380
EISSN	1873-5290
起始页码	56
结束页码	60
卷号	89-90
英文摘要	Recently, 6-methyl branched glycerol dialkyl glycerol tetraethers (brGDGTs) were separated from 5-methyl brGDGTs, which are used in brGDGT-based proxies. Here we analyzed brGDGTs in 27 soil samples along the 400 mm isoline of mean annual precipitation in China by using tandem 2D liquid chromatography. The fractional abundance of 6-methyl brGDGTs showed a positive correlation with soil pH, while that of 5-methyl brGDGTs decreased with increasing soil pH. The abundance ratio of 6-/5-methyl brGDGTs, namely the isomerization of branched tetraethers (IBT), was calculated. The correlation of IBT with pH (pH = 6.33 - 1.28 x IBT; R-2 0.89; root mean squared error, RMSE, 0.24) was much stronger than that of the traditionally used cyclization index of branched tetraethers (CBT) with pH (R-2 0.52; RMSE 0.49) and comparable with that of CBT' with pH (R-2 0.88; RMSE 0.25). Compiling all available data from 319 soil samples resulted in a global calibration: pH = 6.53 - 1.55 x IBT (R-2 0.72; RMSE 0.65), which has a better correlation than the CBT5ME-pH proxy (R-2 0.63; RMSE 0.78), but a weaker correlation than the CBT'-pH proxy (R-2 0.85; RMSE 0.52). Our result suggests that the IBT is a promising indicator for soil pH, particularly in cases when some compounds in the CBT' index cannot be determined. (C) 2015 Elsevier Ltd. All rights reserved.
关键词	DIALKYL GLYCEROL TETRAETHERS ENVIRONMENTAL CONTROLS LIPID DISTRIBUTION MEMBRANE-LIPIDS IDENTIFICATION
英文关键词	6-Methyl brGDGTs; Soil pH; CBT; IBT; GDGTs
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000365402600006
来源期刊	ORGANIC GEOCHEMISTRY
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/258576
推荐引用方式 GB/T 7714	Xiao, Wenjie,Xu, Yunping,Ding, Su,et al. Global calibration of a novel, branched GDGT-based soil pH proxy[J]. 中国科学院青藏高原研究所,2015,89-90.
APA	Xiao, Wenjie.,Xu, Yunping.,Ding, Su.,Wang, Yinghui.,Zhang, Xinyu.,...&Hou, Juzhi.(2015).Global calibration of a novel, branched GDGT-based soil pH proxy.ORGANIC GEOCHEMISTRY,89-90.
MLA	Xiao, Wenjie,et al."Global calibration of a novel, branched GDGT-based soil pH proxy".ORGANIC GEOCHEMISTRY 89-90(2015).