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    Factors determining seagrass Blue Carbon across bioregions and geomorphologies

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    2021GB006935.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Mazarrasa, Inés cc
    Lavery, P. S. cc
    Duarte, Carlos M. cc
    Lafratta, Anna
    Lovelock, Catherine E.
    Macreadie, Peter I.
    Samper-Villarreal, Jimena
    Salinas, Cristian cc
    Sanders, Christian cc
    Trevathan-Tackett, Stacey M. cc
    Young, Mary
    Steven, Andy
    Serrano, Oscar
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2021-06-11
    Online Publication Date
    2021-06-11
    Print Publication Date
    2021-06
    Embargo End Date
    2021-11-21
    Submitted Date
    2021-01-04
    Permanent link to this record
    http://hdl.handle.net/10754/669233
    
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    Abstract
    Seagrass meadows rank among the most significant organic carbon (Corg) sinks on earth. We examined the variability in seagrass soil Corg stocks and composition across Australia and identified the main drivers of variability, applying a spatially hierarchical approach that incorporates bioregions and geomorphic settings. Top 30 cm soil Corg stocks were similar across bioregions and geomorphic settings (min-max: 20–26 Mg Corg ha-1), but meadows formed by large species (i.e. Amphibolis spp. and Posidonia spp.) showed higher stocks (24–29 Mg Corg ha-1) than those formed by smaller species (e.g. Halodule, Halophila, Ruppia, Zostera, Cymodocea and Syringodium; 12–21 Mg Corg ha-1). In temperate coastal meadows dominated by large species, soil Corg stocks mainly derived from seagrass Corg (72± 2 %), while allochthonous Corg dominated soil Corg stocks in meadows formed by small species in temperate and tropical estuarine meadows (64 ± 5%). In temperate coastal meadows, soil Corg stocks were enhanced by low hydrodynamic exposure associated with high mud and seagrass Corg contents. In temperate estuarine meadows, soil Corg stocks were enhanced by high contributions of seagrass Corg, low to moderate solar radiation and low human pressure. In tropical estuarine meadows formed by small species, large soil Corg stocks were mainly associated with low hydrodynamic energy, low rainfall and high solar radiation. These results showcase that bioregion and geomorphic setting are not necessarily good predictors of soil Corg stocks and that site-specific estimates based on local environmental factors are needed for Blue Carbon projects and greenhouse gases accounting purposes.
    Citation
    Mazarrasa, I., Lavery, P., Duarte, C. M., Lafratta, A., Lovelock, C. E., Macreadie, P. I., … Serrano, O. (2021). Factors determining seagrass Blue Carbon across bioregions and geomorphologies. Global Biogeochemical Cycles. doi:10.1029/2021gb006935
    Publisher
    American Geophysical Union (AGU)
    Journal
    Global Biogeochemical Cycles
    DOI
    10.1029/2021gb006935
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1029/2021GB006935
    ae974a485f413a2113503eed53cd6c53
    10.1029/2021gb006935
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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