(StuttgartInternational Conference "Landscapes and Soils through Time" en Anglais - 2014)

Document title

The effect of pedological conditions on the sources and sinks of silicon in the Vertic Planosols in south-western Ethiopia

published at : Landscapes and soils through time

Authors(s) and Affiliation(s)

CORNELIS J.-T. (1) ; DUMON M. (2) ; TOLOSSA A.R. (2 3) ; DELVAUX B. (1) ; DECKERS J. (4) ; VAN RANST E. (2) ;
(1) Earth and Life Inst., Univ. catholique de Louvain (UCL), Louvain-la-Neuve, BELGIQUE
(2) Dep. of Geology and Soil Science, Univ., Ghent, BELGIQUE
(3) Dept. of Natural Resources Management, Jimma Univ. College of Agriculture and Veterinary Medicine, ETHIOPIE
(4) Dep. of Earth and Environmental Sciences, K. Univ., Geo-Inst., Heverlee, BELGIQUE


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 of kaolinite and intense lateral leaching. In the vertic Bw horizon the sources and sinks of Si are governed by the dissolution of phytoliths, the adsorption on and desorption from Fe oxides and slow leaching. These results clearly indicate that the contrasting 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



International Conference "Landscapes and Soils through Time", Stuttgart , ALLEMAGNE (29/07/2011 - 01/08/2011)

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2014, vol. 112 [pp. 131-138]

Bibliographic references : 1 p.

Collation : fig., tabl.



INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2013.02.014

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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