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Título

Long-term carbon storage and its recent loss in an estuarine Posidonia australis meadow (Albany, Western Australia)

AutorRozaimi, M.; Lavery, Paul S. ; Serrano, Oscar ; Kyrwood, D.
Palabras claveGlobal change
Seagrass
Organic matter
Carbonate
Blue carbon sink
Eutrophication
Fecha de publicación2016
EditorElsevier
CitaciónEstuarine, Coastal and Shelf Science 171 : 58-65 (2016)
ResumenOyster Harbour, on the south coast of Western Australia, supports 3.6e3.9 km2 of seagrass meadows, following the loss of approximately 2.8e3.1 km2 in the 1980s. This small area of prevailing meadows hold significant carbon stores accumulated over the past 3000 years. In this study, we sampled three sediment cores from a Posidonia australis meadow and analysed organic matter (OM), organic carbon (OC) and inorganic carbon (IC) contents in bulk sediments, and d13C signatures of OM. The OM and OC contents (mean ± SE) in the cores were 9.07 ± 0.36% and 2.24 ± 0.05%, respectively. The mean IC content was 3.16 ± 0.17%. d13C signatures of the sedimentary OM ranged from 10.01‰ to 13.28‰. Using a Bayesian isotopic mixing model, it is estimated that 57e67% of the OM in the seagrass sediments was derived from P. australis detrital matter. The total carbon (TC) stores in 150 cm-thick seagrass sediments averaged 27.92 kg TC m 2 (10.79 kg OC m 2 and 17.13 kg IC m 2). Based on radiocarbon dating, the mean sediment accumulation rate was 0.0494 cm yr 1, which led to a long-term TC accumulation rate of 8.92 g TC m 2 yr 1 (3.45 g OC m 2 yr 1 and 5.47 g IC m 2 yr 1). Based on historical seagrass cover (3.6 e6.7 km2 during the 1960s to 1980s), the estimated TC stores in 150 cm-thick seagrass sediments at Oyster Harbour would have been 101e187 Gg TC. The eutrophication-driven loss of seagrasses during the 1980s resulted in the absence of OC accumulation capacity amounting to 280e310 Mg OC (over 29 years). The loss of seagrass area could also have resulted in the release of 37e41 Gg CO2, assuming that all of the OC in shallow sediment is remineralised after meadow disturbance. These results exemplify the importance of seagrasses meadows as important carbon sinks and the potential for losses of carbon stores due to ecosystem degradation.
DescripciónEste artículo contiene 8 páginas, 3 tablas, 3 figuras.
Versión del editorhttp://dx.doi.org/10.1016/j.ecss.2016.01.001
URIhttp://hdl.handle.net/10261/154140
DOI10.1016/j.ecss.2016.01.001
ISSN0272-7714
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