'Black' soils in the southern Alps : Clay mineral formation and transformation, x-ray amorphous Al phases and Fe forms

'Black' soils in the southern Alps : Clay mineral formation and transformation, x-ray amorphous Al phases and Fe forms

Many soils in southern Switzerland have a black color, contain a large amount of soil organic matter (SOM) and seem to have some andic properties although they did not develop on volcanic parent material. We investigated three typical 'black' soils to determine the mechanisms of (clay) min...

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Bibliographische Detailangaben
Hauptverfasser: Zanelli, R, Egli, M, Mirabella, A, Abdelmoula, Mustapha, Plötze, Michael, Nötzli, M
Format: Artikel
Sprache:eng
Schlagworte:
Fe-speciation
Fire
Maghemite
Soil Minerals
Weathering
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Zusammenfassung:Many soils in southern Switzerland have a black color, contain a large amount of soil organic matter (SOM) and seem to have some andic properties although they did not develop on volcanic parent material. We investigated three typical 'black' soils to determine the mechanisms of (clay) mineral formation and transformation. We measured total element pools as well as the dithionite-, pyrophosphate-and oxalate-extractable fractions (Fe, Al, Si). The clay fraction (