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Contributions of organic and inorganic matter to sediment volume and accretion in tidal wetlands at steady state

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dc.contributor.author Morris, James T. en
dc.contributor.author Barber, Donald C. en
dc.contributor.author Callaway, John C. en
dc.contributor.author Chambers, Randy en
dc.contributor.author Hagen, Scott C. en
dc.contributor.author Hopkinson, Charles S. en
dc.contributor.author Johnson, Beverly J. en
dc.contributor.author Megonigal, J. Patrick en
dc.contributor.author Neubauer, Scott C. en
dc.contributor.author Troxler, Tiffany en
dc.contributor.author Wigand, Cathleen en
dc.date.accessioned 2016-04-27T18:35:04Z
dc.date.available 2016-04-27T18:35:04Z
dc.date.issued 2016
dc.identifier.citation Morris, James T., Barber, Donald C., Callaway, John C., Chambers, Randy, Hagen, Scott C., Hopkinson, Charles S., Johnson, Beverly J., Megonigal, J. Patrick, Neubauer, Scott C., Troxler, Tiffany, and Wigand, Cathleen. 2016. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F28610">Contributions of organic and inorganic matter to sediment volume and accretion in tidal wetlands at steady state</a>." <em>Earth's Future</em>. 4 (4):110&ndash;121. <a href="https://doi.org/10.1002/2015EF000334">https://doi.org/10.1002/2015EF000334</a> en
dc.identifier.issn 2328-4277
dc.identifier.uri https://hdl.handle.net/10088/28610
dc.description.abstract A mixing model derived from first principles describes the bulk density (BD) of intertidal wetland sediments as a function of loss on ignition (LOI). The model assumes the bulk volume of sediment equates to the sum of self-packing volumes of organic and mineral components or BD = 1/LOI/k1 + (1-LOI)/k2], where k1 and k2 are the self-packing densities of the pure organic and inorganic components, respectively. The model explained 78% of the variability in total BD when fitted to 5075 measurements drawn from 33 wetlands distributed around the conterminous United States. The values of k1 and k2 were estimated to be 0.085?-±0.0007?g?cm-3 and 1.99?±?0.028?g?cm-3, respectively. Based on the fitted organic density (k1) and constrained by primary production, the model suggests that the maximum steady state accretion arising from the sequestration of refractory organic matter is?=?0.3?cm?yr-1. Thus, tidal peatlands are unlikely to survive indefinitely a higher rate of sea-level rise in the absence of a significant source of mineral sediment. Application of k2 to a mineral sediment load typical of East and eastern Gulf Coast estuaries gives a vertical accretion rate from inorganic sediment of 0.2?cm?yr-1. Total steady state accretion is the sum of the parts and therefore should not be greater than 0.5?cm?yr-1 under the assumptions of the model. Accretion rates could deviate from this value depending on variation in plant productivity, root:shoot ratio, suspended sediment concentration, sediment-capture efficiency, and episodic events. en
dc.relation.ispartof Earth's Future en
dc.title Contributions of organic and inorganic matter to sediment volume and accretion in tidal wetlands at steady state en
dc.type Journal Article en
dc.identifier.srbnumber 139412
dc.identifier.doi 10.1002/2015EF000334
rft.jtitle Earth's Future
rft.volume 4
rft.issue 4
rft.spage 110
rft.epage 121
dc.description.SIUnit SERC en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 110
dc.citation.epage 121

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