Soil Physicochemical Properties and Geochemical Indices: Diagnostic Tools for Evaluating Pedogenesis in Tephra-Derived Soils along the Cameroon Volcanic Line

摘要: Physical and geochemical properties of six soils developed on tephra from Mts. Kupe Manengouba were studied in order to assess the degree weathering tephric parent materials. Physico-chemical determined following standard procedures. Total elemental contents selective extracted Al Fe by acid ammonium oxalate, dithionite-citrate-bicarbonate (DCB) pyrophosphate using inductively coupled plasma optical emission spectroscopy (ICP-OES) after being brought into solution. Parent rocks chemically classified as hawaiite, tephricfoidite, basanites, while Andosols Cambisols. Both have high concentrations SiO2, Al2O3, Fe2O3. Texture evaluated related indices correlate with horizon development are important capturing differences between two Reference Soil Groups. Mobility major elements showed erratic trends conformity stratigraphic breaks indicating variability materials depth. Enrichment depletion a certain explains ongoing andosolization process Andosols. data can both be used concomitantly for assessment these soils. reserve bases (TRB) is very presence large quantities weatherable minerals thus potential agricultural production.