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  • Examining the response of an eastern Australian mangrove forest to changes in hydro-period over the last century

    Author(s)
    Marx, Samuel K
    Knight, Jon M
    Dwyer, Patrick G
    Child, David P
    Hotchkis, Michael AC
    Zawadzki, Atun
    Griffith University Author(s)
    Knight, Jon M.
    Year published
    2020
    Metadata
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    Abstract
    This study examines mangrove substrate production within a mangrove basin forest in the Tweed Estuary, northern New South Wales, Australia. This is achieved using high resolution dating of 239+240Pu, 236U and 210Pb in mangrove sediments to examine both the modes and rates of mangrove substrate production. Results show a shift in the mode of substrate production occurred approximately 70 years ago in response to human modification of the Tweed Estuary (hydrologic changes). At that time, mangrove substrate production shifted from being dominated by sedimentation processes (fine silt accumulation) to being dominated by biological ...
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    This study examines mangrove substrate production within a mangrove basin forest in the Tweed Estuary, northern New South Wales, Australia. This is achieved using high resolution dating of 239+240Pu, 236U and 210Pb in mangrove sediments to examine both the modes and rates of mangrove substrate production. Results show a shift in the mode of substrate production occurred approximately 70 years ago in response to human modification of the Tweed Estuary (hydrologic changes). At that time, mangrove substrate production shifted from being dominated by sedimentation processes (fine silt accumulation) to being dominated by biological processes (mangrove root production). Since that time, mangrove peat has been accreting at the study site at the same rate as local sea level rise (SLR), implying current rates of peat substrate development are tuned to increasing sea level. A further implication of the shift to biological accretion at rates corresponding with SLR is that the studied mangrove basin is sequestering C at increasing rates due to subsurface root production.
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    Journal Title
    Estuarine, Coastal and Shelf Science
    Volume
    241
    DOI
    https://doi.org/10.1016/j.ecss.2020.106813
    Subject
    Science & Technology
    Life Sciences & Biomedicine
    Physical Sciences
    Marine & Freshwater Biology
    Oceanography
    Publication URI
    http://hdl.handle.net/10072/400811
    Collection
    • Journal articles

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