The effect of pedological conditions on the sources and sinks of silicon in the Vertic Planosols in south-western Ethiopia
The aim of this paper is to assess the impact of pedological conditions on the sources of dissolved Si and its dynamics in a Vertic Planosol characterized by contrasting bleached and vertic horizons. The activity of dissolved Si as H4SiO4
in the aqueous phase of the Vertic Planosols in south-western Ethiopia seems to be controlled in the bleached E horizon by the balance between the dissolution of feldspars and volcanic glass, active uptake by grasses (formation of phytoliths), neoformation
pedological conditions in the bleached and vertic horizons impact the sources and sinks of Si in the Vertic Planosols in south-western Ethiopia, and as such could partly control terrestrial Si fluxes.
Concordance entre les deux classifications et spécificités pour la RDA des sols semi-hydromorphes, du passage des chernozems aux phaeozems et de la délimitation des planosols.