Geochemical analyses reveal the importance of environmental history for blue carbon sequestration

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dc.contributor.authorKelleway, JJen_AU
dc.contributor.authorSaintilan, Nen_AU
dc.contributor.authorMacreadie, PIen_AU
dc.contributor.authorBaldock, JAen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorZawadzki, Aen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorRalph, PJen_AU
dc.date.accessioned2021-06-03T00:43:08Zen_AU
dc.date.available2021-06-03T00:43:08Zen_AU
dc.date.issued2017-07-07en_AU
dc.date.statistics2021-06-02en_AU
dc.description.abstractCoastal habitats including saltmarshes and mangrove forests can accumulate and store significant blue carbon stocks, which may persist for millennia. Despite this implied stability, the distribution and structure of intertidal-supratidal wetlands are known to respond to changes imposed by geomorphic evolution, climatic, sea level, and anthropogenic influences. In this study, we reconstruct environmental histories and biogeochemical conditions in four wetlands of similar contemporary vegetation in SE Australia. The objective is to assess the importance of historic factors to contemporary organic carbon (C) stocks and accumulation rates. Results from the four cores—two collected from marine-influenced saltmarshes (Wapengo marine site (WAP-M) and Port Stephens marine site (POR-M)) and two from fluvial influenced saltmarshes (Wapengo fluvial site (WAP-F) and Port Stephens fluvial site (POR-F))—highlight different environmental histories and preservation conditions. High C stocks are associated with the presence of a mangrove phase below the contemporary saltmarsh sediments in the POR-M and POR-F cores. 13C nuclear magnetic resonance analyses show this historic mangrove root C to be remarkably stable in its molecular composition despite its age, consistent with its position in deep sediments. WAP-M and WAP-F cores did not contain mangrove root C; however, significant preservation of char C (up to 46% of C in some depths) in WAP-F reveals the importance of historic catchment processes to this site. Together, these results highlight the importance of integrating historic ecosystem and catchment factors into attempts to upscale C accounting to broader spatial scales. ©2017 American Geophysical Union - Open Accessen_AU
dc.identifier.citationKelleway, J. J., Saintilan, N., Macreadie, P. I., Baldock, J. A., Heijnis, H., Zawadzki, A., Gadd, P., Jacobsen, G. & Ralph, P. J. (2017). Geochemical analyses reveal the importance of environmental history for blue carbon sequestration. Journal of Geophysical Research: Biogeosciences, 122(7), 1789-1805. doi:10.1002/2017JG003775en_AU
dc.identifier.issn2169-8961en_AU
dc.identifier.issue7en_AU
dc.identifier.journaltitleJournal of Geophysical Research: Biogeosciencesen_AU
dc.identifier.pagination1789-1805en_AU
dc.identifier.urihttps://doi.org/10.1002/2017JG003775en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10795en_AU
dc.identifier.volume122en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectCarbonen_AU
dc.subjectSalinityen_AU
dc.subjectMarshesen_AU
dc.subjectMangrovesen_AU
dc.subjectWetlandsen_AU
dc.subjectEnvironmental impactsen_AU
dc.titleGeochemical analyses reveal the importance of environmental history for blue carbon sequestrationen_AU
dc.typeJournal Articleen_AU
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