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  • Exploring the oxygen sensitivity of wetland soil carbon mineralization

    Author(s)
    Chapman, Samantha K
    Hayes, Matthew A
    Kelly, Brendan
    Langley, J Adam
    Griffith University Author(s)
    Hayes, Matthew
    Year published
    2019
    Metadata
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    Abstract
    Soil oxygen availability may influence blue carbon, which is carbon stored in coastal wetlands, by controlling the decomposition of soil organic matter. We are beginning to quantify soil oxygen availability in wetlands, but we lack a precise understanding of how oxygen controls soil carbon dynamics. In this paper, we synthesize existing data from oxic and anoxic wetland soil incubations to determine how oxygen controls carbon mineralization. We define the oxygen sensitivity of carbon mineralization as the ratio of carbon mineralization rate in oxic soil to this rate in anoxic soil, such that higher values of this ratio ...
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    Soil oxygen availability may influence blue carbon, which is carbon stored in coastal wetlands, by controlling the decomposition of soil organic matter. We are beginning to quantify soil oxygen availability in wetlands, but we lack a precise understanding of how oxygen controls soil carbon dynamics. In this paper, we synthesize existing data from oxic and anoxic wetland soil incubations to determine how oxygen controls carbon mineralization. We define the oxygen sensitivity of carbon mineralization as the ratio of carbon mineralization rate in oxic soil to this rate in anoxic soil, such that higher values of this ratio indicate greater sensitivity of carbon mineralization to oxygen. The estimates of oxygen sensitivity we derived from existing literature show a wide range of ratios, from 0.8 to 33, across wetlands. We then report oxygen sensitivities from an experimental mesocosm we developed to manipulate soil oxygen status in realistic soils. The variation in oxygen sensitivity we uncover from this systematic review and experiment indicates that Earth system models may misrepresent the oxygen sensitivity of carbon mineralization, and how it varies with context, in wetland soils. We suggest that altered soil oxygen availability could be an important driver of future blue carbon storage in coastal wetlands.
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    Journal Title
    Biology Letters
    Volume
    15
    Issue
    1
    DOI
    https://doi.org/10.1098/rsbl.2018.0407
    Subject
    Biological sciences
    Science & Technology
    Life Sciences & Biomedicine
    Biology
    Ecology
    Evolutionary Biology
    Publication URI
    http://hdl.handle.net/10072/394679
    Collection
    • Journal articles

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