Zafer Defne Tracy Elsey Quirk Julia M. Moriarty Neil Kamal Ganju 2019 <div class="article-section__content en main"><p>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&nbsp;±&nbsp;33 (export) and&nbsp;102&nbsp;±&nbsp;28 (import)&nbsp;g&nbsp;OM·m⁻²·year⁻¹<span>&nbsp;</span>and net POC fluxes ranging between −52&nbsp;±&nbsp;14 and&nbsp;43&nbsp;±&nbsp;12&nbsp;g&nbsp;C·m⁻²·year⁻¹. A regression employing two measures of stability, the unvegetated‐vegetated marsh ratio (UVVR) and elevation, explained &gt;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&nbsp;±&nbsp;1,570&nbsp;Mg OM/year (15&nbsp;±&nbsp;10&nbsp;g OM·m⁻²·year⁻¹) and a net POC import of 1,263&nbsp;±&nbsp;632&nbsp;Mg C/year (8&nbsp;±&nbsp;4&nbsp;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&nbsp;Mg OM/year and&nbsp;−&nbsp;1,291&nbsp;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.</p></div> application/pdf 10.1029/2018JG004920 en AGU Role of tidal wetland stability in lateral fluxes of particulate organic matter and carbon article