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Article Dans Une Revue Applied Clay Science Année : 2015

Occurrence of iron and aluminum sesquioxides and their implications for the P sorption in subtropical soils

Edson Bortoluzzi
  • Fonction : Auteur
Carlos Gustavo Pérez
  • Fonction : Auteur
Jose Ardisson
  • Fonction : Auteur
Tales T. Tiecher
  • Fonction : Auteur

Résumé

The effect of the pedo-climatic variation in qualitative and quantitative soil sesquioxide contents and soil phosphorus (P) sorption capacities has been studied. In four soils (samples from A horizons) located along a southern Brazilian environmental gradient (EG) shown a decrease in crystallized iron oxides with the increase of altitude. Hematite and goethite were found at low EG altitudes in association with low soil organic carbon content, and goethite-ferrihydrite and gibbsite were found at high altitudes in association with high organic carbon content. The adsorbed soil P (measured by the remaining P) was predicted by the goethite content, and the desorbed P (measured by successive P extractions using anion exchange resin membranes) was predicted mainly by the goethite and clay content. In subtropical soils, even a smooth environmental gradient could determine the qualitative and quantitative iron and aluminum sesquioxide distributions that control soil P sorption capacities.
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Dates et versions

hal-01313078 , version 1 (09-05-2016)

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Edson Bortoluzzi, Carlos Gustavo Pérez, Jose Ardisson, Tales T. Tiecher, Laurent Caner. Occurrence of iron and aluminum sesquioxides and their implications for the P sorption in subtropical soils . Applied Clay Science, 2015, 104, pp.104. ⟨10.1016/j.clay.2014.11.032⟩. ⟨hal-01313078⟩
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