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    Role of tidal wetland stability in lateral fluxes of particulate organic matter and carbon

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    Date
    2019-04-23
    Author
    Ganju, Neil K.  Concept link
    Defne, Zafer  Concept link
    Elsey-Quirk, Tracy  Concept link
    Moriarty, Julia M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/24560
    As published
    https://doi.org/10.1029/2018JG004920
    DOI
    10.1029/2018JG004920
    Abstract
    Tidal wetland fluxes of particulate organic matter and carbon (POM, POC) are important terms in global budgets but remain poorly constrained. Given the link between sediment fluxes and wetland stability, POM and POC fluxes should also be related to stability. We measured POM and POC fluxes in eight microtidal salt marsh channels, with net POM fluxes ranging between −121 ± 33 (export) and 102 ± 28 (import) g OM·m−2·year−1 and net POC fluxes ranging between −52 ± 14 and 43 ± 12 g C·m−2·year−1. A regression employing two measures of stability, the unvegetated‐vegetated marsh ratio (UVVR) and elevation, explained >95% of the variation in net fluxes. The regression indicates that marshes with lower elevation and UVVR import POM and POC while higher elevation marshes with high UVVR export POM and POC. We applied these relationships to marsh units within Barnegat Bay, New Jersey, USA, finding a net POM import of 2,355 ± 1,570 Mg OM/year (15 ± 10 g OM·m−2·year−1) and a net POC import of 1,263 ± 632 Mg C/year (8 ± 4 g C·m−2·year−1). The magnitude of this import was similar to an estimate of POM and POC export due to edge erosion (−2,535 Mg OM/year and − 1,291 Mg C/year), suggesting that this system may be neutral from a POM and POC perspective. In terms of a net budget, a disintegrating wetland should release organic material, while a stable wetland should trap material. This study quantifies that concept and demonstrates a linkage between POM/POC flux and geomorphic stability.
    Description
    Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Biogeosciences 124(5), (2019): 1265-1277, doi:10.1029/2018JG004920.
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    • Sediment Transport
    Suggested Citation
    Ganju, N. K., Defne, Z., Elsey-Quirk, T., & Moriarty, J. M. (2019). Role of tidal wetland stability in lateral fluxes of particulate organic matter and carbon. Journal of Geophysical Research-Biogeosciences, 124(5), 1265-1277.
     
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