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Iron’s role in soil organic carbon (de)stabilization in mangroves under land use change

Author

Listed:
  • Francisco Ruiz

    (“Luiz de Queiroz” College of Agriculture/University of São Paulo (ESALQ/USP))

  • Angelo Fraga Bernardino

    (Federal University of Espírito Santo)

  • Hermano Melo Queiroz

    (Cidade Universitária)

  • Xosé Luis Otero

    (Faculty of Biology, University of Santiago de Compostela – USC
    A Graña Marine Biology Station)

  • Cornelia Rumpel

    ((iEES Paris, UMR Sorbonne Université, CNRS, INRAE, UPEC, IRD))

  • Tiago Osório Ferreira

    (“Luiz de Queiroz” College of Agriculture/University of São Paulo (ESALQ/USP)
    Center for Carbon Research in Tropical Agriculture (CCARBON) - University of São Paulo
    University of São Paulo)

Abstract

Mangroves are coastal hotspots for carbon storage and yet face multiple threats from anthropogenic activities. Here we explore the role of iron-mediated organomineral interactions (FeOMIs) in soil organic carbon (SOC) stabilization and their sensitivity to land use change (LUC) in Amazonian mangroves. We show that Fe oxides protect more labile SOC fractions, which would otherwise be vulnerable to biological degradation, with poorly crystalline Fe oxides being the most effective phase for SOC retention. Despite the fragile equilibrium of FeOMI under dynamic redox conditions in mangroves, this balance sustains approximately 8% of total SOC. The studied LUC scenario led to massive loss of FeOMIs as less crystalline phases were either degraded or transformed into more crystalline ones, losing the efficiency in retaining SOC. The conversion of mangroves to pastures and shrimp ponds, which are pervasive globally, triggers important biogeochemical changes, with major implications for the carbon sequestration potential of mangrove soils.

Suggested Citation

  • Francisco Ruiz & Angelo Fraga Bernardino & Hermano Melo Queiroz & Xosé Luis Otero & Cornelia Rumpel & Tiago Osório Ferreira, 2024. "Iron’s role in soil organic carbon (de)stabilization in mangroves under land use change," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-54447-z
    DOI: 10.1038/s41467-024-54447-z
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    References listed on IDEAS

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