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dc.contributor.authorHouston, Alex
dc.contributor.authorGarnett, Mark
dc.contributor.authorAustin, William
dc.identifier.citationHouston , A , Garnett , M & Austin , W 2024 , ' Blue carbon additionality : new insights from the radiocarbon content of saltmarsh soils and their respired CO 2 ' , Limnology and Oceanography , vol. Early View .
dc.identifier.otherORCID: /0000-0001-6511-2677/work/153977462
dc.descriptionWe thank the NERC SUPER DTP for funding the PhD through which this research was undertaken. We acknowledge support from the National Environmental Isotope Facility in funding the 14C measurements for this study under grant NE/S011587/1 (allocation numbers 2500.0422, 2594.1022).en
dc.description.abstractInternational policy frameworks recognize the net drawdown and storage of atmospheric greenhouse gases through management interventions on blue carbon ecosystems (saltmarshes, mangroves, seagrasses) as potential emissions offset strategies. However, key questions remain around the ‘additionality’ of the carbon sequestered by these ecosystems, and whether some fraction of the organic carbon (OC) that does not derive from in-situ production (allochthonous) should be included in carbon budgets. This study compares the radiocarbon (14C) contents of saltmarsh soils and CO2 evolved from aerobic laboratory incubations to show that young OC is preferentially respired over aged OC, and that the latter is also vulnerable to remineralisation under oxic conditions. This highlights that management interventions which reduce the exposure of saltmarsh soils to oxic conditions support the inclusion of some portion of allochthonous OC in carbon budgets. Elevated temperature incubations provide preliminary evidence that the predominant source of respired OC will not change under predicted future warmer conditions. Saltmarsh typology also influences the 14C content of both the bulk soil and respired CO2, highlighting the importance of site selection for optimized blue carbon additionality.
dc.relation.ispartofLimnology and Oceanographyen
dc.subjectBlue carbonen
dc.subjectCarbon cyclingen
dc.titleBlue carbon additionality : new insights from the radiocarbon content of saltmarsh soils and their respired CO2en
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Geography & Sustainable Developmenten
dc.contributor.institutionUniversity of St Andrews. Environmental Change Research Groupen
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews. St Andrews Sustainability Instituteen
dc.contributor.institutionUniversity of St Andrews. Centre for Blue Carbonen
dc.description.statusPeer revieweden

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