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• W4312001935 startingPage "730" @default.
• W4312001935 abstract "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." @default.
• W4312001935 created "2023-01-03" @default.
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• W4312001935 date "2022-12-20" @default.
• W4312001935 modified "2023-09-27" @default.
• W4312001935 title "Manganese Oxidation States in Volcanic Soils across Annual Rainfall Gradients" @default.
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• W4312001935 doi "https://doi.org/10.1021/acs.est.2c02658" @default.
• W4312001935 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36538415" @default.
• W4312001935 hasPublicationYear "2022" @default.
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