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

文献类型：期刊论文

作者Guo Jingjing6; Ma Tian4,7; Liu Nana1; Zhang Xinying2,7; Hu Huifeng7; Ma Wenhong3; Wang Zhiheng5; Feng Xiaojuan2,7; Peterse Francien6
刊名Organic Geochemistry
出版日期2021-11
卷号164页码:XXX
关键词brGDGTs Soil pH Aridity Acidobacteria Verrucomicrobia Actinobacteria Environmental proxy
ISSN号0146-6380
DOI10.1016/j.orggeochem.2021.104347
文献子类Article
英文摘要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 calibration 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 (r2 = 0.70, p < 0.01), and its subclass Spartobacteria (r2 = 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 (r2 = 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.
WOS关键词brGDGTs ; Soil pH ; Aridity ; Acidobacteria ; Verrucomicrobia ; Actinobacteria ; Environmental proxy
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000759650900006
源URL[http://ir.yic.ac.cn/handle/133337/40074]  
专题个人在本单位外知识产出
通讯作者Guo Jingjing
作者单位1.State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, 100190 Beijing, China
2.College of Resources and Environment, University of Chinese Academy of Sciences, 100049 Beijing, China
3.College of Resources and Environment, University of Chinese Academy of Sciences, 100049 Beijing, China
4.State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, 730000 Lanzhou, China
5.Institute of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of Education, College of Urban and Environmental Sciences, Peking University, 100871 Beijing, China
6.Department of Earth Sciences, Utrecht University, 3584 CB Utrecht, the Netherlands
7.Department of Earth Sciences, Utrecht University, 3584 CB Utrecht, the Netherlands
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,2021,164:XXX.
APA Guo Jingjing.,Ma Tian.,Liu Nana.,Zhang Xinying.,Hu Huifeng.,...&Peterse Francien.(2021).Soil pH and aridity influence distributions of branched tetraether lipids in grassland soils along an aridity transect.Organic Geochemistry,164,XXX.
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(2021):XXX.

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来源：烟台海岸带研究所

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