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First assessment of seagrass carbon accumulation rates in Sweden: A field study from a fjord system at the Skagerrak coast
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science. Centro de Estudios Avanzados de Blanes, Consejo Superior de Investigaciones Científicas (CEAB-CSIC), Blanes, Spain.ORCID iD: 0000-0003-2016-4857
University of Gothenburg, Sweden.ORCID iD: 0000-0001-9406-0976
Stockholm University, Sweden.ORCID iD: 0000-0002-1055-8505
Stockholm University, Sweden.ORCID iD: 0000-0003-0363-110X
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2023 (English)In: PLOS Climate, E-ISSN 2767-3200, Vol. 2, no 1, article id e0000099Article in journal (Refereed) Published
Abstract [en]

Seagrass meadows are globally important blue carbon sinks. In northern cold-temperate regions, eelgrass (Zostera marina) is the dominant seagrass species, and although their sedimentary carbon stocks have been quantified across regions, information regarding the CO2 withdrawal capacity as carbon sinks remains scarce. Here we assessed the carbon (Corg) accumulation rates (CARs) and stocks as well as the organic matter sources in five seagrass meadows in the Gullmar Fjord area on the Swedish Skagerrak coast. We found that the mean (±SD) CAR was 14 ± 3 g Corg m-2 yr-1 over the last ~120–140 years (corresponding to a yearly uptake of 52.4 ± 12.6 g CO2 m-2). The carbon sink capacity is in line with other Z. marina areas but relatively low compared to other seagrass species and regions globally. About half of the sedimentary carbon accumulation (7.1 ± 3.3 g Corg m-2 yr-1) originated from macroalgae biomass, which highlights the importance of non-seagrass derived material for the carbon sink function of seagrass meadows in the area. The Corg stocks were similar among sites when comparing at a standardized depth of 50 cm (4.6–5.9 kg Corg m-2), but showed large variation when assessed for the total extent of the cores (ranging from 0.7 to 20.6 kg Corg m-2 for sediment depths of 11 to at least 149 cm). The low sediment accretion rates (1.18–1.86 mm yr-1) and the relatively thick sediment deposits (with a maximum of >150 cm of sediment depth) suggests that the carbon stocks have likely been accumulated for an extended period of time, and that the documented loss of seagrass meadows in the Swedish Skagerrak region and associated erosion of the sediment could potentially have offset centuries of carbon sequestration.

Place, publisher, year, edition, pages
Public Library of Science (PLoS), 2023. Vol. 2, no 1, article id e0000099
National Category
Climate Research
Identifiers
URN: urn:nbn:se:sh:diva-51277DOI: 10.1371/journal.pclm.0000099OAI: oai:DiVA.org:sh-51277DiVA, id: diva2:1748702
Part of project
Climate change mitigation capacity of the Baltic coastal seascape: identification of hotspot environments for coastal blue carbon sequestration and guidance for sustainable management of the Baltic coastal landscapes under global change (CLIM-SCAPE), The Foundation for Baltic and East European StudiesUnravelling the relative influence of climate and land-use change on nitrogen retention in Baltic Sea coastal sediments over the last 300 years, The Foundation for Baltic and East European Studies
Funder
The Foundation for Baltic and East European Studies, 21-GP-0005The Foundation for Baltic and East European Studies, 21-PD2-0002Helge Ax:son Johnsons stiftelse , F21-0103Australian Research Council, LE170100219
Note

Funder:

Albert och Maria Bergström foundation

Bolin Centre for climate research

Available from: 2023-04-04 Created: 2023-04-04 Last updated: 2023-04-13Bibliographically approved

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Dahl, MartinGullström, Martin

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