Soil pH and aridity influence distributions of branched tetraether lipids in grassland soils along an aridity transect

doi:10.1016/j.orggeochem.2021.104347

	Soil pH and aridity influence distributions of branched tetraether lipids in grassland soils along an aridity transect
	Guo, Jingjing ; Ma, Tian 1,2; Liu, Nana 3; Zhang, Xinying 1,4; Hu, Huifeng 1; Ma, Wenhong 5; Wang, Zhiheng 6,7; Feng, Xiaojuan1,4 ; Peterse, Francien
	2022
发表期刊	ORGANIC GEOCHEMISTRY
ISSN	0146-6380
卷号	164
摘要	Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are membrane lipids of certain soil bacteria, and their relative distributions are used as a proxy for air temperature and soil pH. While temperature is recorded by the degree of methylation, soil pH is reflected by the amount of internal cyclization and the relative abundance of 6-methyl isomers. Since the exact producers of brGDGTs remain enigmatic, the mechanisms underlying their empirical relationships with temperature and soil pH, and thus the reliability of brGDGT-based paleorecords, are not well understood, especially in arid regions where mean annual precipitation (MAP) is less than 500 mm. Here, we evaluate the influence of soil pH and aridity on brGDGT distributions in grassland soils along an aridity transect (MAP = 173-415 mm) in Inner Mongolia. While the absolute and fractional abundance of 6-methyl brGDGTs increases with increasing soil pH and aridity, following the trend in the global surface soil calibra-tion dataset, the degree of cyclization does not. This indicates that in arid regions, soil pH reconstructions based on the relative contribution of 6-methyl brGDGTs are likely more reliable than those based on the degree of cyclization. Furthermore, 5-and 6-methyl brGDGTs respond differently to aridity, supporting prior suggestions that the distribution of brGDGTs could be the result of changes in bacterial community composition instead of the direct physiological alteration of molecular structures by the source organisms. Analysis of the bacterial community composition in the same soil transect indicates that the relative abundance of Acidobacteria, the phylum hosting potential brGDGT source-organisms, shows a poor relationship with aridity. Instead, Verruco-microbia (r(2) = 0.70, p < 0.01), and its subclass Spartobacteria (r(2) = 0.70, p < 0.01) in particular, show a sig-nificant negative correlation with aridity, resembling that of 5-methyl brGDGTs. Similarly, Actinobacteria are positively correlated with aridity (r(2) = 0.59, p < 0.01), following the same trend as that of 6-methyl brGDGTs. The ability of certain cultures of Verrucomicrobia and Actinobacteria to produce iso-C15:0 fatty acids that could serve as building blocks for brGDGTs hints that Verrucomicrobia and Actinobacteria could possibly produce brGDGTs in arid soils.
关键词	brGDGTs Soil pH Aridity Acidobacteria Verrucomicrobia Actinobacteria Environmental proxy
学科领域	Geochemistry & Geophysics
DOI	10.1016/j.orggeochem.2021.104347
收录类别	SCI
语种	英语
WOS关键词	DIALKYL GLYCEROL TETRAETHERS ; ISO-DIABOLIC ACID ; SP-NOV. ; GEN. NOV. ; MEMBRANE-LIPIDS ; TIBETAN PLATEAU ; ACTINOBACTERIUM ; ACIDOBACTERIA ; BACTERIAL ; RECONSTRUCTIONS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000759650900006
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1873-5290
资助机构	China Exchange Program of the Royal Netherlands Academy of Arts and Sciences (KNAW) [530-6CDP17] ; Dutch Research Council (NWO) [192.071]
作者邮箱	j.guo@uu.nl
作品OA属性	hybrid, Green Published
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/28776
专题	植被与环境变化国家重点实验室
作者单位	1.Univ Utrecht, Dept Earth Sci, NL-3584 CB Utrecht, Netherlands 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China 4.Chinese Acad Sci, Inst Microbiol, State Key Lab Mycol, Beijing 100190, Peoples R China 5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 6.Inner Mongolia Univ, Coll Ecol & Environm, Hohhot 010021, Peoples R China 7.Peking Univ, Coll Urban & Environm Sci, Inst Ecol, Minist Educ, Beijing 100871, Peoples R China 8.Peking Univ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Guo, Jingjing,Ma, Tian,Liu, Nana,et al. Soil pH and aridity influence distributions of branched tetraether lipids in grassland soils along an aridity transect[J]. ORGANIC GEOCHEMISTRY,2022,164.
APA	Guo, Jingjing.,Ma, Tian.,Liu, Nana.,Zhang, Xinying.,Hu, Huifeng.,...&Peterse, Francien.(2022).Soil pH and aridity influence distributions of branched tetraether lipids in grassland soils along an aridity transect.ORGANIC GEOCHEMISTRY,164.
MLA	Guo, Jingjing,et al."Soil pH and aridity influence distributions of branched tetraether lipids in grassland soils along an aridity transect".ORGANIC GEOCHEMISTRY 164(2022).

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