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  • Spatiotemporal Assessment of GHG Emissions and Nutrient Sequestration Linked to Agronutrient Runoff in Global Wetlands

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    Author(s)
    Pasut, C
    Tang, FHM
    Hamilton, D
    Riley, WJ
    Maggi, F
    Griffith University Author(s)
    Hamilton, David P.
    Year published
    2021
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    Abstract
    Wetlands play a key role in regulating global greenhouse gas (GHG) emissions but anthropogenic impacts on nutrients may severely alter this balance. Recent assessments indicate that almost 22% of the global wetland area may be affected by agricultural runoff. In this work, we developed and applied a dynamic mechanistic reaction network model of soil organic matter linking the carbon (C), nitrogen (N), and sulfur (S) cycles at 0.5° × 0.5° spatial resolution across the globe. The model was used to estimate GHG emissions and nutrient sequestration rates in wetlands, driven by environmental stressors including N, P, and S ...
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    Wetlands play a key role in regulating global greenhouse gas (GHG) emissions but anthropogenic impacts on nutrients may severely alter this balance. Recent assessments indicate that almost 22% of the global wetland area may be affected by agricultural runoff. In this work, we developed and applied a dynamic mechanistic reaction network model of soil organic matter linking the carbon (C), nitrogen (N), and sulfur (S) cycles at 0.5° × 0.5° spatial resolution across the globe. The model was used to estimate GHG emissions and nutrient sequestration rates in wetlands, driven by environmental stressors including N, P, and S fertilization. Wetland annual GHG emissions are estimated to be 136 ± 12.5 Tg C-CH , 589 ± 45.8 Tg C-CO , and 0.3 ± 0.04 Tg N-N O; in contrast, C, N, and S annual sequestration rates are estimated to be 576 ± 88.1 Tg C, 20 ± 4.4 Tg N, and 7.4 ± 0.8 Tg S, between 2000 and 2017. N fertilization inputs were responsible for 13% N O emissions in wetlands in the Northern Hemisphere, while tropical wetlands were major reservoirs for C, N, and S. Temperature, net primary productivity, and methanogenic microorganisms exert the major control on GHG emissions. Wetland CH and CO emissions were found to have a hysteretic relationship with seasonal soil temperature, but not N O. A global-scale assessment is pivotal for best nutrient management practices, reducing nutrient losses, and controlling gas emissions. 4 2 2 2 4 2 2
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    Journal Title
    Global Biogeochemical Cycles
    Volume
    35
    Issue
    4
    DOI
    https://doi.org/10.1029/2020GB006816
    Copyright Statement
    © 2021 American Geophysical Union. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Geochemistry
    Computational modelling and simulation in earth sciences
    Publication URI
    http://hdl.handle.net/10072/404343
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    • Journal articles

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