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A global assessment of mangrove soil organic carbon sources and implications for blue carbon credit

Author

Listed:
  • Jingfan Zhang

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

  • Shuchai Gan

    (Chinese Academy of Sciences)

  • Pingjian Yang

    (Chinese Research Academy of Environmental Sciences)

  • Jinge Zhou

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

  • Xingyun Huang

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

  • Han Chen

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

  • Hua He

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

  • Neil Saintilan

    (Macquarie University)

  • Christian J. Sanders

    (Southern Cross University)

  • Faming Wang

    (Chinese Academy of Sciences
    Hainan University
    Southern Marine Science and Engineering Guangdong Laboratory)

Abstract

Mangroves can retain both autochthonous and allochthonous marine and/or terrestrial organic carbon (OC) in sediments. Accurate quantification of these OC sources is essential for the proper allocation of blue C credits. Here, we conduct a global-scale analysis of sediments autochthonous and allochthonous OC contributions in estuarine and marine mangroves using stable isotopes. Globally, mangrove-derived autochthonous OC was the main contributor to estuarine and marine mangrove top-meter soil organic carbon (SOC) (49% and 62%, respectively). Less marine allochthonous OC (21%) was deposited than terrestrial allochthonous OC (30%) in estuarine mangrove sediments. Estuarine mangroves accumulated more SOC in sediments than marine mangroves (282 ± 8.1 Mg C ha−1 and 250 ± 5.0 Mg C ha−1, respectively), primarily due to the additional terrestrial OC inputs. Globally, marine mangroves held 67% of the total mangrove SOC, reaching 3025 ± 345 Tg C, while 1502 ± 154 Tg C was stored in estuarine mangrove sediments. The findings emphasize the substantial influence of coastal environmental settings on OC contributions, underlining the necessity of accurate OC source quantification for the effective allocation of blue carbon credits.

Suggested Citation

  • Jingfan Zhang & Shuchai Gan & Pingjian Yang & Jinge Zhou & Xingyun Huang & Han Chen & Hua He & Neil Saintilan & Christian J. Sanders & Faming Wang, 2024. "A global assessment of mangrove soil organic carbon sources and implications for blue carbon credit," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53413-z
    DOI: 10.1038/s41467-024-53413-z
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    References listed on IDEAS

    as
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    4. Scott A. Kulp & Benjamin H. Strauss, 2019. "Author Correction: New elevation data triple estimates of global vulnerability to sea-level rise and coastal flooding," Nature Communications, Nature, vol. 10(1), pages 1-2, December.
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