Carbon burial in sediments below seaweed farms matches that of Blue Carbon habitats

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Duarte, Carlos M. and Delgado-Huertas, Antonio and Marti, Elisa and Gasser, Beat and Martin, Isidro San and Cousteau, Alexandra and Neumeyer, Fritz and Reilly-Cayten, Megan and Boyce, Joshua and Kuwae, Tomohiro and Hori, Masakazu and Miyajima, Toshihiro and Price, Nichole N. and Arnold, Suzanne and Ricart, Aurora M. and Davis, Simon and Surugau, Noumie and Abdul, Al-Jeria and Wu, Jiaping and Xiao, Xi and Chung, Ik Kyo and Choi, Chang Geun and Sondak, Calvyn F. A. and Albasri, Hatim and Krause-Jensen, Dorte and Bruhn, Annette and Boderskov, Teis and Hancke, Kasper and Funderud, Jon and Borrero-Santiago, Ana R. and Pascal, Fred and Joanne, Paul and Ranivoarivelo, Lanto and Collins, William T. and Clark, Jennifer and Gutierrez, Juan Fermin and Riquelme, Ricardo and Avila, Marcela and Macreadie, Peter I. and Masque, Pere (2025) Carbon burial in sediments below seaweed farms matches that of Blue Carbon habitats. Nature Climate Change, 15 (2). pp. 180-187. ISSN 1758-678X

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Abstract

Seaweed farming has emerged as a potential Blue Carbon strategy, yet empirical estimates of carbon burial from such farms remain lacking in the literature. Here, we quantify carbon burial in 20 seaweed farms distributed globally, ranging from 2 to 300 years in operation and from 1 to 15,000 ha in size. The thickness of sediment layers and stocks of organic carbon accumulated below the farms increased with farm age, reaching 140 tC ha−1 for the oldest farm. Organic carbon burial rates averaged 1.87 ± 0.73 tCO2e ha−1 yr−1 in farm sediments, twice that in reference sediments. The excess CO2e burial attributable to the seaweed farms averaged 1.06 ± 0.74 CO2e ha−1 yr−1, confirming that seaweed farming in depositional environments buries carbon in the underlying sediments at rates towards the low range of that of Blue Carbon habitats, but increasing with farm age.

Item Type: Article
Subjects: Natural Resources & Earth Sciences > Natural Resource Management
Depositing User: Maria Regina Karunia
Date Deposited: 23 Sep 2026 08:22
Last Modified: 23 Sep 2026 08:25
URI: https://karya.brin.go.id/id/eprint/60509

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