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Stability of organic carbon accumulating in Spartina alterniflora-dominated salt marshes of the Mid-Atlantic U.S
Journal article   Open access   Peer reviewed

Stability of organic carbon accumulating in Spartina alterniflora-dominated salt marshes of the Mid-Atlantic U.S

Viktoria Unger, Tracy Elsey-Quirk, Christopher Sommerfield and David Velinsky
Estuarine, coastal and shelf science, v 182, pp 179-189
05 Dec 2016
DOI: https://doi.org/10.1016/j.ecss.2016.10.001
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.1016/j.ecss.2016.10.001View
Accepted (AM)Open Access (Publisher-Specific),  Open

Abstract

Accretion Estuaries Labile carbon Refractory carbon
Organic carbon sequestration in salt marsh soils is a function of factors that influence both spatial variability and chemical stability of accumulating carbon. Refractory carbon (slowly decomposed) may be the most important in terms of long-term sequestration and is widely referred to in models of carbon storage; however, little information exists about the quantity and variability of refractory carbon accumulation in marshes. In this study, total (CT), labile (CL) and refractory (CR) organic carbon accumulation rates were measured for Spartina alterniflora-dominated marshes representing different geomorphological settings with a range of vertical accretion rates. Three 50-cm long cores were collected in each of three marshes in Barnegat Bay and three marshes in Delaware Estuary, USA. Rates of C accumulation were calculated using Cesium-137 dating and the relative stability of soil organic carbon was quantified using acid-hydrolysis. CT accumulation ranged over fourfold among marshes from 72 to 346 g m−2 yr−1. CT and CL accumulation increased with increasing mineral sediment accumulation, while CR accumulation was uniform across cores averaging 78 ± 5 g m−2 yr−1. Similar rates of CR accumulation across marsh areas with different accretion and mineral sediment accumulation rates was associated with a decline in the CR:CL density ratio as mineral volume increased. Our results suggest that carbon accumulation is higher in salt marshes with higher mineral sedimentation due, primarily, to the burial of labile carbon, and that there is a limit on the rate of chemically recalcitrant carbon accumulation in marsh soils.

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Collaboration types
Domestic collaboration
Web of Science research areas
Marine & Freshwater Biology
Oceanography
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