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<p>Kelp forests offer substantial carbon fixation, with the potential to contribute to natural climate solutions (NCS). However, to be included in national NCS inventories, governments must first quantify the kelp-derived carbon stocks and fluxes leading to carbon sequestration. Here, we present a blueprint for assessing the national blue carbon capacity of kelp forests in which data synthesis and Bayesian hierarchical modeling enable estimates of kelp carbon production, storage, and export capacity from limited data. Applying this blueprint to Canada’s extensive coastline, we estimate kelps hold 0.6 to 2.8 Tg C in short-term biomass, producing 1.1 to 6.2 Tg C yr<sup>-1</sup>, of which 0.04 to 0.4 Tg C yr<sup>-1</sup> could be exported to the deep ocean. While modest compared to terrestrial sinks, our findings suggest kelps have comparable carbon sequestration to marine and freshwater wetlands, warranting further consideration in Canada’s NCS inventories. Our transparent, reproducible blueprint represents an important step towards accurate carbon accounting for kelp forests.</p>

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A blueprint for national assessments of the blue carbon capacity of kelp forests applied to Canada’s coastline

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月4日

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  • Jennifer McHenry,
  • Daniel K. Okamoto,
  • Karen Filbee-Dexter,
  • Kira A. Krumhansl,
  • Kathleen A. MacGregor,
  • Margot Hessing-Lewis,
  • Brian Timmer,
  • Philippe Archambault,
  • Claire M. Attridge,
  • Delphine Cottier,
  • Maycira Costa,
  • Matthew Csordas,
  • Ladd E. Johnson,
  • Joanne Lessard,
  • Alejandra Mora-Soto,
  • Anna Metaxas,
  • Christopher K. Neufeld,
  • Ondine Pontier,
  • Luba Reshitnyk,
  • Samuel Starko,
  • Jennifer Yakimishyn,
  • Julia K. Baum

摘要

Kelp forests offer substantial carbon fixation, with the potential to contribute to natural climate solutions (NCS). However, to be included in national NCS inventories, governments must first quantify the kelp-derived carbon stocks and fluxes leading to carbon sequestration. Here, we present a blueprint for assessing the national blue carbon capacity of kelp forests in which data synthesis and Bayesian hierarchical modeling enable estimates of kelp carbon production, storage, and export capacity from limited data. Applying this blueprint to Canada’s extensive coastline, we estimate kelps hold 0.6 to 2.8 Tg C in short-term biomass, producing 1.1 to 6.2 Tg C yr-1, of which 0.04 to 0.4 Tg C yr-1 could be exported to the deep ocean. While modest compared to terrestrial sinks, our findings suggest kelps have comparable carbon sequestration to marine and freshwater wetlands, warranting further consideration in Canada’s NCS inventories. Our transparent, reproducible blueprint represents an important step towards accurate carbon accounting for kelp forests.