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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Contrasting Stocks and Origins of Particulate and Mineral-associated Soil Organic Carbon in a Mangrove-Salt Marsh Ecotone
Author(s): Assavapanuvat, Prakhin
Breithaupt, Joshua
Engelbert, Kevin
Schroeder, Christian
Smoak, Joseph
Bianchi, Thomas
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Keywords: Mineral-associated organic carbon
Iron-bound organic carbon
Reactive iron
Salt marsh
Soil organic carbon fraction
Issue Date: Jun-2024
Date Deposited: 7-May-2024
Citation: Assavapanuvat P, Breithaupt J, Engelbert K, Schroeder C, Smoak J & Bianchi T (2024) Contrasting Stocks and Origins of Particulate and Mineral-associated Soil Organic Carbon in a Mangrove-Salt Marsh Ecotone. <i>Geoderma</i>, 446, Art. No.: 116904.
Abstract: The global warming-driven poleward expansion of mangrove habitats (e.g., Avicennia germinans and Rhizophora mangle) into temperate salt marshes (e.g., Spartina alterniflora and Juncus roemerianus) has been shown to alter coastal soil organic carbon (SOC) storage. However, the taxa-specific consequences of this vegetation shift on the origin and size of SOC sub-fractions (particulate OC (POC); mineral-associated OC (MAOC); and reactive iron-associated OC (FeR-MAOC)) remain largely unexplored. In this study, we used a particle size-based SOC fractionation method to compare quantity and δ13C composition of bulk and each SOC sub-fractions in soil cores collected from Apalachicola Bay barrier islands in Florida, USA, the highest latitude where monospecific communities of all four aforementioned plants co-occur. Depth-dependent variation of bulk soil δ13C clearly showed the global warming-driven replacement of S. alterniflora by mangroves, as well as reciprocal substitutions of S. alterniflora and J. roemerianus, probably driven by changes in wetland elevation. Higher OC burial rates in mangrove habitats suggested that mangrove soils were principally developed by particle deposition. In contrast, comparatively lower OC burial rates but higher OC stocks in salt marsh habitats illustrated subsurface OC input from salt marsh roots. POC was primarily derived from contemporary plant detritus; its concentration was higher in salt marsh habitats (58.8 ± 9.0% of SOC) relative to mangroves (38.4 ± 6.0% of SOC). In contrast, MAOC content did not vary across plant habitats (53.5 ± 10.9% of SOC), and principally originated from microbially-transformed OC and pre-existing plants. FeR-MAOC was essentially absent in R. mangle soils (2.9 ± 3.6% of SOC) while representing a minor fraction of MAOC in three other plant habitats (7.8 ± 7.0% of SOC). The δ13C (delta 13C) of FeR-MAOC was more like the present-day surface plants, highlighting the in situ FeR-MAOC formation in their active oxidizing rhizospheres.
DOI Link: 10.1016/j.geoderma.2024.116904
Rights: his article is available under the Creative Commons CC-BY-NC-ND license and permits non-commercial use of the work as published, without adaptation or alteration provided the work is fully attributed. For commercial reuse, permission must be requested below.
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