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Microbial-inorganic Carbon Interactions of Soft Sediments in the Northern Shore of Hulun Lake, Inner Mongolia, China and Their Biogeochemical Significance(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2025年第06期
Page:
1015-1027
Research Field:
沉积地质与油气勘探
Publishing date:

Info

Title:
Microbial-inorganic Carbon Interactions of Soft Sediments in the Northern Shore of Hulun Lake, Inner Mongolia, China and Their Biogeochemical Significance
Author(s):
GAO Xiao1; 2; 3; 4*;  ZHOU Gang4;  Michael STEINER1; 2;  HAN Zuo-zhen1; 2; 3
(1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 2. Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 3. Laboratory for Marine Mineral Resources, Qingdao Marine Science and Technology Center, Qingdao 266237, Shandong, China; 4. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China)
Keywords:
biogeochemistry;  sediment;  inorganic carbon;  microorganism;  carbon sink;  carbonate pump;  Hulun Lake;  Inner Mongolia
PACS:
P571; P66
DOI:
10.19814/j.jese.2025.05001
Abstract:
Microorganisms are the core driving force for carbon mineralization in lake sediments, playing a dominant role in key biogeochemical processes such as organic matter degradation, inorganic carbon transformation, and carbonate precipitation. However, research on their role in the formation of lake carbon sinks remains relatively limited. Hulun Lake in Inner Mongolia was selected as the study area; by integrating a suite of analytical techniques, including 16S rRNA gene sequencing, carbon component analysis, water chemistry measurements, scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), and Raman spectroscopy, a systematic investigation of lake sediments and water samples was conducted. Furthermore, molecular dynamics(MD)simulations were employed to explore the mechanistic pathways of microbially mediated inorganic carbon precipitation. The results show that Hulun Lake in Inner Mongolia is a freshwater system characterized by diverse and abundant microbial communities in its sediments, including bacterial genera such as BD2-11_terrestrial_group, Halomonas and Nitrolancea, as well as algal microorganisms; the contents of inorganic carbon(IC), total carbon(TC), and total organic carbon(TOC)all increase with depth, exhibiting a clear vertical distribution pattern; the δ13C values of inorganic carbon range from -19.16‰ to -11.39‰, indicating a generally negative bias that suggests the carbonates in the sediments may originate from CO2 produced by microbial metabolism; mineralogical analyses consistently identify characteristic peaks of carbonate minerals such as calcite and dolomite, further confirming the presence of inorganically precipitated carbonates in the sediments; in organic mineralization systems containing fulvic acid, CO2-3 forms larger ion clusters with Ca2+ and Mg2+ more readily, and these aggregates also nucleate significantly faster than in purely inorganic mineralization systems. In summary, this study further elucidates the mechanism of microbial action in the carbonate pump mechanism of lakes, expands the understanding of the biogeochemical functions of microorganisms in the lake carbon sink, and deepens the comprehension of the coupled process of “lake carbon sink-microbial action”.

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Last Update: 2025-12-10