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Photo-produced aromatic compounds stimulate microbial degradation of dissolved organic carbon in thermokarst lakes

Author

Listed:
  • Jie Hu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Luyao Kang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Ziliang Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Xuehui Feng

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Caifan Liang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zan Wu

    (Chinese Academy of Sciences)

  • Wei Zhou

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Xuning Liu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yuanhe Yang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Leiyi Chen

    (Chinese Academy of Sciences)

Abstract

Photochemical and biological degradation of dissolved organic carbon (DOC) and their interactions jointly contribute to the carbon dioxide released from surface waters in permafrost regions. However, the mechanisms that govern the coupled photochemical and biological degradation of DOC are still poorly understood in thermokarst lakes. Here, by combining Fourier transform ion cyclotron resonance mass spectrometry and microbial high-throughput sequencing, we conducted a sunlight and microbial degradation experiment using water samples collected from 10 thermokarst lakes along a 1100-km permafrost transect. We demonstrate that the enhancement of sunlight on DOC biodegradation is not associated with the low molecular weight aliphatics produced by sunlight, but driven by the photo-produced aromatics. This aromatic compound-driven acceleration of biodegradation may be attributed to the potential high abilities of the microbes to decompose complex compounds in thermokarst lakes. These findings highlight the importance of aromatics in regulating the sunlight effects on DOC biodegradation in permafrost-affected lakes.

Suggested Citation

  • Jie Hu & Luyao Kang & Ziliang Li & Xuehui Feng & Caifan Liang & Zan Wu & Wei Zhou & Xuning Liu & Yuanhe Yang & Leiyi Chen, 2023. "Photo-produced aromatic compounds stimulate microbial degradation of dissolved organic carbon in thermokarst lakes," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39432-2
    DOI: 10.1038/s41467-023-39432-2
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    References listed on IDEAS

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