Document Type

Article

Department/Program

Virginia Institute of Marine Science

Publication Date

4-28-2021

Journal

Geophysical Research Letters

Volume

48

Issue

8

First Page

e2020GL092051

Abstract

Coastal wetland carbon pools are globally important, but their response to interacting facets of global change remain unclear. Numerical models neglect species-specific vegetation responses to sea level rise (SLR) and elevated CO2 (eCO2) that are observed in field experiments, while field experiments cannot address the long-term feedbacks between flooding and soil growth that models show are important. Here, we present a novel numerical model of marsh carbon accumulation parameterized with empirical observations from a long-running eCO2 experiment in an organic rich, brackish marsh. Model results indicate that eCO2 and SLR interact synergistically to increase soil carbon burial, driven by shifts in plant community composition and soil volume expansion. However, newly parameterized interactions between plant biomass and decomposition (i.e. soil priming) reduce the impact of eCO2 on marsh survival, and by inference, the impact of eCO2 on soil carbon accumulation.

DOI

doi: 10.1029/2020GL092051

Publication Statement

© 2021. American Geophysical Union.

2020gl092051-sup-0001-Rietl.docx (68 kB)
Supporting Information

Available for download on Monday, November 01, 2021

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