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Improved estimates on global carbon stock and carbon pools in tidal wetlands

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  • Xiaoguang Ouyang

    (The Chinese University of Hong Kong)

  • Shing Yip Lee

    (The Chinese University of Hong Kong
    The Chinese University of Hong Kong)

Abstract

Tidal wetlands are global hotspots of carbon storage but errors exist with current estimates on their carbon density due to the use of factors estimated from other habitats for converting loss-on-ignition (LOI) to organic carbon (OC); and the omission of certain significant carbon pools. Here we show that the widely used conversion factor (LOI/OC = 1.724) is significantly lower than our measurements for saltmarsh sediments (1.92 ± 0.01) and oversimplifies the polynomial relationship between sediment OC and LOI for mangrove forests. Global mangrove OC stock in the top-meter sediment reaches 1.93 Pg when corrected for this bias, and is 20% lower than the previous estimates. Ecosystem carbon stock (living and dead biomass, sediment OC and inorganic carbon) is estimated at 3.7–6.2 Pg. Mangrove deforestation leads to carbon emission rates at 23.5–38.7 Tg yr−1 after 2000. Mangrove sediment OC stock has previously been over-estimated while ecosystem carbon stock underestimated.

Suggested Citation

  • Xiaoguang Ouyang & Shing Yip Lee, 2020. "Improved estimates on global carbon stock and carbon pools in tidal wetlands," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-019-14120-2
    DOI: 10.1038/s41467-019-14120-2
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    Cited by:

    1. Xiaoguang Ouyang & Shingyip Lee & Wenqing Wang, 2021. "The ‘Perfect’ Conversion: Dramatic Increase in CO 2 Efflux from Shellfish Ponds and Mangrove Conversion in China," Sustainability, MDPI, vol. 13(23), pages 1-13, November.
    2. Sarah M. Al-Guwaiz & Abdulrahman A. Alatar & Mohamed A. El-Sheikh & Ghazi A. Al-Gehni & Mohammad Faisal & Ahmed A. Qahtan & Eslam M. Abdel-Salam, 2021. "Role of Mangrove Rehabilitation and Protection Plans on Carbon Storage in Yanbu Industrial City, Saudi Arabia: A Case Study," Sustainability, MDPI, vol. 13(23), pages 1-10, November.
    3. 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.

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