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Advances in Earth Science >

2023 , Vol. 38 >Issue 5: 470 - 482

DOI: https://doi.org/10.11867/j.issn.1001-8166.2023.016

Advances in Microbe Mediated Key Processes of the Carbon Cycle in Thermokarst Lakes

  • Qian XU ,
  • Cunde XIAO ,
  • Yaru FENG ,
  • Zhiheng DU ,
  • Lei WANG ,
  • Zhiqiang WEI
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  • 1.State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
    2.University Chinese Academy of Sciences, Beijing 100049, China
    3.State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
    4.Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Zhuhai Guangdong 519087, China
XU Qian (1992-), female, Lanzhou City, Gansu Province, Ph.D student. Research area includes observation on carbon dynamics in thermokarst lakes. E-mail: xuqian @nieer.ac.cn
XIAO Cunde (1969-), male, Dingxi City, Gansu Province, Professor. Research areas include the cryosphere and global change, cryosphere functions and services. E-mail: cdxiao@bnu.edu.cn

Received date: 2022-10-17

  Revised date: 2022-12-29

  Online published: 2023-05-10

Supported by

the National Key Research and Development Program of China “Effects of thermokarst landforms on greenhouse gas fluxes and their biological mechanisms”(2022YFF0801903);The Youth Innovation Promotion Association, Chinese Academy of Sciences(2020419)

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Abstract

As a result of global warming, the melting of ice-rich permafrost causes the ground to collapse, thereby creating thermokarst lakes, while the greenhouse effect caused by the concurrent release of greenhouse gases results in a positive feedback with climate warming. Microorganisms play important roles in various aspects of the carbon cycle. Understanding the mechanisms of microbial regulation of the carbon cycle in thermally melting lakes is of great significance for coping with future climate change. Therefore, by combining previous studies, this paper first elucidates the formation process of thermokarst lakes and the microorganisms inhabiting these special habitats; subsequently, the main microorganisms involved in organic carbon decomposition, methane production, and methane oxidation, and the regulation mechanisms and influencing factors are analyzed in detail. Based on this analysis, we conclude the following: ① The organic matter in thermokarst lakes originates from the land, while some nutrients, such as phosphates, plant biopolymers, and leucine residues, are also transported from the land to the water. ② With improvements in temperature and aeration conditions, the availability of most nutrients increases the genetic diversity of microorganisms and promotes their roles in organic carbon decomposition. Changes in temperature, substrate, dissolved oxygen, and microbial community affect the processes of methane production, methane oxidation, and carbon sequestration, thereby affecting the carbon cycle. ③ Some deficiencies in previous studies are summarized, and a new research perspective is proposed to deepen our understanding of microbial involvement in the carbon cycle in thermokarst lakes. With the help of metagenomic technology and incubation, the regulatory mechanisms of microbes for the carbon cycle can be revealed more clearly, and field observations of carbon emissions from thermokarst lakes under different environmental conditions can be strengthened. Exploring the use of microbes for mitigating the negative effects of climate change should be based on the above fundamental research.

Key words： Permafrost; Thermokarst lake; Key microbial process; Greenhouse gases

Cite this article

Qian XU , Cunde XIAO , Yaru FENG , Zhiheng DU , Lei WANG , Zhiqiang WEI . Advances in Microbe Mediated Key Processes of the Carbon Cycle in Thermokarst Lakes[J]. Advances in Earth Science, 2023 , 38(5) : 470 -482 . DOI: 10.11867/j.issn.1001-8166.2023.016

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