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|Title:||Occurrence of iron and aluminumsesquioxides and their implications for the P sorption in subtropical soils|
|Title of periodic:||Applied Clay Science|
|Authors:||Bortoluzzi, Edson C.|
Pérez, Carlos A.S.
Ardisson, José Domingos
|Affiliation:||Universidade de Passo Fundo, Passo Fundo, Rio Grande do Sul, RS, Brasil|
Universidade de Passo Fundo, Passo Fundo, Rio Grande do Sul, RS, Brasil
Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo Horizonte, MG, Brasi
Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, RS, Brasil
Université de Poitiers, Poitiers, France
|Abstract:||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 fromA 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.|
|Appears in Collections:||Artigo de periódico|
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