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Manganese Oxidation States in Volcanic Soils across Annual Rainfall Gradients.
Wen, Ke; Chadwick, Oliver A; Vitousek, Peter M; Paulus, Elizabeth L; Landrot, Gautier; Tappero, Ryan V; Kaszuba, John P; Luther, George W; Wang, Zimeng; Reinhart, Benjamin J; Zhu, Mengqiang.
Afiliación
  • Wen K; Department of Ecosystem Science and Management, University of Wyoming, Laramie, Wyoming82071, United States.
  • Chadwick OA; Department of Geography, University of California, Santa Barbara, California93106, United States.
  • Vitousek PM; Department of Biology, Stanford University, Stanford, California94305, United States.
  • Paulus EL; Department of Biology, Stanford University, Stanford, California94305, United States.
  • Landrot G; Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin91190, France.
  • Tappero RV; Brookhaven National Laboratory, NSLS-II, Upton, New York11973, United States.
  • Kaszuba JP; Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming82071, United States.
  • Luther GW; School of Energy Resources, University of Wyoming, Laramie, Wyoming82071, United States.
  • Wang Z; School of Marine Science and Policy, University of Delaware, Lewes, Delaware19958, United States.
  • Reinhart BJ; Department of Environmental Science and Engineering, Fudan University, Shanghai200438, China.
  • Zhu M; Argonne National Laboratory, Chicago, Illinois60439, United States.
Environ Sci Technol ; 57(1): 730-740, 2023 01 10.
Article en En | MEDLINE | ID: mdl-36538415
Manganese (Mn) exists as Mn(II), Mn(III), or Mn(IV) in soils, and the Mn oxidation state controls the roles of Mn in numerous environmental processes. However, the variations of Mn oxidation states with climate remain unknown. We determined the Mn oxidation states in highly weathered bulk volcanic soils (primary minerals free) across two rainfall gradients covering mean annual precipitation (MAP) of 0.25-5 m in the Hawaiian Islands. With increasing MAP, the soil redox conditions generally shifted from oxic to suboxic and to anoxic despite fluctuating at each site; concurrently, the proportions of Mn(IV) and Mn(II) decreased and increased, respectively. Mn(III) was low at both low and high MAP, but accumulated substantially, up to 80% of total Mn, in soils with prevalent suboxic conditions at intermediate MAP. Mn(III) was likely hosted in Mn(III,IV) and iron(III) oxides or complexed with organic matter, and its distribution among these hosts varied with soil redox potentials and soil pH. Soil redox conditions and rainfall-driven leaching jointly controlled exchangeable Mn(II) in soils, with its concentration peaking at intermediate MAP. The Mn redox chemistry was at disequilibrium, with the oxidation states correlating with long-term average soil redox potentials better than with soil pH. The soil redox conditions likely fluctuated between oxic and anoxic conditions more frequently at intermediate than at low and high MAP, creating biogeochemical hot spots where Mn, Fe, and other redox-sensitive elements may be actively cycled.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Compuestos Férricos / Manganeso Idioma: En Revista: Environ Sci Technol Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Compuestos Férricos / Manganeso Idioma: En Revista: Environ Sci Technol Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos