Unlocking the Secrets of Saline Lakes: How Environmental and Microbial Interactions Shape Protodolomite Formation

IF 3.4 2区地球科学 Q2 BIOLOGY

Geobiology Pub Date : 2025-10-02 DOI:10.1111/gbi.70035

Yang Li, Xuan Qiu, Deng Liu, Hongmei Wang, Xiaoyan Liu, Weiqi Wang, Ting Chen, Haochao Zhangsun, Xinyu Cai, Shengping Jin, Guangquan Yu

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引用次数: 0

Abstract

Protodolomite formation in saline lakes remains enigmatic, despite favorable conditions for dolomite precipitation. To unravel this mystery, sediment samples were collected from two saline lakes in northeastern Inner Mongolia: Jibuhulangtu Nuur (JBHLT) and Dabusan Nuur (DBS). These samples were subjected to comprehensive analysis, including mineral composition detection, measurement of physicochemical variables, analysis of extracellular polymeric substances (EPS), and 16S rRNA sequencing. Results showed that protodolomite was exclusively observed in JBHLT, even though both lakes were supersaturated with respect to dolomite. Microbial communities in JBHLT were dominated by Gammaproteobacteria and Desulfuromonadia. Polysaccharide in EPS extracted from sediments was significantly enriched in JBHLT and positively correlated with microbial alpha diversity. pH was found to be the main factor significantly impacting microbial community composition, diversity, and functions. In DBS, increased pH led to the dominance of Halanaerobiaeota, while decreased microbial diversity and polysaccharide contents. The interplay of pH, microbial community structure, and sediment EPS content concurrently impacts protodolomite formation. Our findings highlight the interaction between environmental conditions and microbial communities and their consequence in terms of protodolomite mineralization.

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揭开盐湖的秘密：环境和微生物的相互作用如何塑造原白云岩的形成。

盐湖中的原白云岩形成仍然是一个谜，尽管白云岩沉淀的有利条件。为了解开这个谜团，研究人员从内蒙古东北部的两个盐湖：吉布呼郎图湖（JBHLT）和大布山湖（DBS）收集了沉积物样本。对这些样品进行综合分析，包括矿物成分检测、理化变量测量、细胞外聚合物（EPS）分析和16S rRNA测序。结果表明，在JBHLT中只观察到原白云岩，尽管两个湖的白云岩含量都过饱和。JBHLT微生物群落以γ变形菌和Desulfuromonadia为主。沉积物中提取的EPS多糖在JBHLT中显著富集，且与微生物α多样性呈正相关。pH值是影响微生物群落组成、多样性和功能的主要因素。在DBS中，pH升高导致嗜酸厌食菌群占优势，而微生物多样性和多糖含量降低。pH、微生物群落结构和沉积物EPS含量的相互作用同时影响原生白云岩的形成。我们的发现强调了环境条件和微生物群落之间的相互作用及其在原白云岩成矿作用方面的影响。

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来源期刊

Geobiology 生物-地球科学综合

CiteScore

6.80

自引率

5.40%

发文量

审稿时长

3 months

期刊介绍： The field of geobiology explores the relationship between life and the Earth''s physical and chemical environment. Geobiology, launched in 2003, aims to provide a natural home for geobiological research, allowing the cross-fertilization of critical ideas, and promoting cooperation and advancement in this emerging field. We also aim to provide you with a forum for the rapid publication of your results in an international journal of high standing. We are particularly interested in papers crossing disciplines and containing both geological and biological elements, emphasizing the co-evolutionary interactions between life and its physical environment over geological time. Geobiology invites submission of high-quality articles in the following areas: Origins and evolution of life Co-evolution of the atmosphere, hydrosphere and biosphere The sedimentary rock record and geobiology of critical intervals Paleobiology and evolutionary ecology Biogeochemistry and global elemental cycles Microbe-mineral interactions Biomarkers Molecular ecology and phylogenetics.