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Sediment carbon accumulation is southern latitude saltmarsh communities of Tasmania, Australia

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Ellison, JC ORCID: 0000-0003-0692-8347 and Beasy, KM ORCID: 0000-0002-5998-1419 2018 , 'Sediment carbon accumulation is southern latitude saltmarsh communities of Tasmania, Australia' , Biology, vol. 7, no. 2 , pp. 1-11 , doi: 10.3390/biology7020027.

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Abstract

Carbon sequestration values of wetlands are greatest in their sediments. Northern hemisphere research dominates the earlier saltmarsh carbon sequestration literature, recently augmented by analyses across mainland Australia where species assemblages, catchment histories and environmental settings differ. No previous assessment has been made for Tasmania. Carbon stores and accumulation rates in saltmarsh sediments of the Rubicon estuary, Tasmania, were investigated. Carbon was determined from sediment cores by Elemental Analyser, combined with analysis of organic content and bulk density. Carbon accumulation was determined using short-term and long-term sediment accretion indicators. Results showed carbon densities to be lower than global averages, with variation found between carbon stores of native and introduced species zones. Cores from introduced Spartina anglica indicated a trend of higher sediment carbon percentages relative to cores from native saltmarsh Juncus kraussii and Sarcocornia quinqueflora, and in finer grain sizes. Sediment carbon stock of 30 cm depths was 49.5 Mg C ha−1 for native saltmarsh and 55.5 Mg C ha−1 for Spartina. Carbon percentages were low owing to high catchment inorganic sediment yields, however carbon accumulation rates were similar to global averages, particularly under Spartina. Covering 85% of saltmarsh area in the estuary, Spartina contributes the majority to carbon stores, potentially indicating a previously unrecognized value for this invasive species in Australia.

Item Type: Article
Authors/Creators:Ellison, JC and Beasy, KM
Keywords: saltmarsh, sediment carbon, wetland, accumulation rates, Spartina, pollen analysis
Journal or Publication Title: Biology
Publisher: MDPIAG
ISSN: 2079-7737
DOI / ID Number: 10.3390/biology7020027
Copyright Information:

Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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