(Article of periodic en Anglais - 2011)

Document title

Impact of rainfall and topography on the distribution of clays and major cations in granitic catenas of southern Africa

Authors(s) and Affiliation(s)

KHOMO L. (1) ; HARTSHORN A.S. (2) ; ROGERS K.H. (3) ; CHADWICK O.A. (4) ;
(1) Max-Planck Inst. für Biogeochemie, Jena, ALLEMAGNE
(2) Dep. of Geology and Environmental Science, James Madison Univ., Harrisonburg, ETATS-UNIS
(3) Centre for Water in the Environment, School of Animal, Plants, and Environmental Sciences, Witwatersrand Univ., Johannesburg, AFRIQUE DU SUD
(4) Dep. of Geography, Univ. of California, Santa Barbara, ETATS-UNIS


Soil catenas integrate and amplify gravity transfer and differentiation processes of eluviation and illuviation in soil profiles. The AA. quantified differences in these redistribution processes along granitic catenas across an arid to sub-humid climate gradient in Kruger National Park, South Africa. They measured soil properties in 9 catenas sampled from 3 areas receiving annual rainfall of 470 mm (arid zone), 550 mm (semi-arid zone) and 730 mm (sub-humid zone). As rainfall increased, kaolinite replaced smectite as the dominant clay mineral in all landscape positions across the catenas. Clay redistribution along catenas was sensitive to climate with the least amount of redistribution occurring in the dry sites and the most occurring in the wet sites. Clay movement and storage conditioned other soil properties such as CEC, base cation distribution, base saturation and pH. The AA. highlight climate and topography as significant drivers of catena differentiation, properties and evolution


Article of periodic

published at : Catena / ISSN 0341-8162

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

Millesime : 2011, vol. 87, no1 [pp. 119-128]

Bibliographic references : 28 ref.

Collation : 5 fig., 4 tabl.



INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2011.05.017

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2011
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