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<p>Coastal wetlands possess significant carbon sequestration rates and storage capabilities. Clarifying the methods for evaluating coastal wetland carbon sinks and identifying existing issues are essential for accurately assessing coastal blue carbon, understanding the carbon balance between terrestrial-coastal-marine ecosystems, and advancing the “dual carbon” goal. This paper reviews the detailed processes of coastal wetland carbon cycling and summarizes the challenges and difficulties in defining, delineating, and identifying the boundaries of coastal wetlands. We generalize current carbon sink evaluation methods across different dimensions by constructing a “black box theory”. In addition, based on the “white box theory”, we propose a net ecosystem carbon balance model for carbon sink assessment, providing a theoretical foundation for enhancing the understanding of coastal wetland carbon sinks and optimizing the evaluation system for coastal blue carbon functionality. We also systematically summarize the current status of carbon sources and sinks in China’s coastal wetlands and propose a technical framework for emission reduction and carbon sequestration enhancement through integrated management of coastal zones and wetlands and regulation of key wetland ecological processes, with the aim of increasing the potential of blue carbon in mitigating climate change. Finally, based on the current research gaps, we outline future research priorities for coastal wetland blue carbon.</p>

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Current status of coastal blue carbon assessment: Theory, methods, and carbon sequestration pathways

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Jilong Wang,
  • Guirui Yu,
  • Hu Ding,
  • Tingting Liu,
  • Xiaogang Chen,
  • Xinru Zhang

摘要

Coastal wetlands possess significant carbon sequestration rates and storage capabilities. Clarifying the methods for evaluating coastal wetland carbon sinks and identifying existing issues are essential for accurately assessing coastal blue carbon, understanding the carbon balance between terrestrial-coastal-marine ecosystems, and advancing the “dual carbon” goal. This paper reviews the detailed processes of coastal wetland carbon cycling and summarizes the challenges and difficulties in defining, delineating, and identifying the boundaries of coastal wetlands. We generalize current carbon sink evaluation methods across different dimensions by constructing a “black box theory”. In addition, based on the “white box theory”, we propose a net ecosystem carbon balance model for carbon sink assessment, providing a theoretical foundation for enhancing the understanding of coastal wetland carbon sinks and optimizing the evaluation system for coastal blue carbon functionality. We also systematically summarize the current status of carbon sources and sinks in China’s coastal wetlands and propose a technical framework for emission reduction and carbon sequestration enhancement through integrated management of coastal zones and wetlands and regulation of key wetland ecological processes, with the aim of increasing the potential of blue carbon in mitigating climate change. Finally, based on the current research gaps, we outline future research priorities for coastal wetland blue carbon.