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Carbon sequestration by Australian tidal marshes

AuthorsMacreadie, Peter I.; Ollivier, Q. R.; Kelleway, Jeffrey J.; Serrano, Oscar CSIC ORCID CVN; Carnell, Paul E.; Lewis, Carolyn J. Ewers; Atwood, Trisha; Sanderman, J.; Baldock, Jeff; Connolly, Rod M.; Duarte, Carlos M. CSIC ORCID; Lavery, Paul S. CSIC ORCID ; Steven, Andy D. L.; Lovelock, Catherine E.
Issue Date2017
PublisherNature Publishing Group
CitationScientific Reports 7 : 44071 (2017)
AbstractAustralia’s tidal marshes have suffered significant losses but their recently recognised importance in CO2 sequestration is creating opportunities for their protection and restoration. We compiled all available data on soil organic carbon (OC) storage in Australia’s tidal marshes (323 cores). OC stocks in the surface 1m averaged 165.41 (SE 6.96) Mg OC ha−1 (range 14–963 Mg OC ha−1). The mean OC accumulation rate was 0.55±0.02 Mg OC ha−1 yr−1. Geomorphology was the most important predictor of OC stocks, with fluvial sites having twice the stock of OC as seaward sites. Australia’s 1.4 million hectares of tidal marshes contain an estimated 212 million tonnes of OC in the surface 1m, with a potential CO2- equivalent value of $USD7.19 billion. Annual sequestration is 0.75 Tg OC yr−1, with a CO2-equivalent value of $USD28.02 million per annum. This study provides the most comprehensive estimates of tidal marsh blue carbon in Australia, and illustrates their importance in climate change mitigation and adaptation, acting as CO2 sinks and buffering the impacts of rising sea level. We outline potential further development of carbon offset schemes to restore the sequestration capacity and other ecosystem services provided by Australia tidal marshes.
DescriptionEste artículo contiene 10 páginas, 3 figuras, 2 tablas.
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