(Article of periodic en Anglais - 2012)

Document title

The indirect impact of encroaching trees on gully extension : A 64 year study in a sub-humid grassland of South Africa

Authors(s) and Affiliation(s)

GRELLIER S. (1) ; KEMP J. (2) ; JANEAU J.-L. (1) ; FLORSCH N. (3) ; WARD D. (4) ; BAROT S. (5) ; PODWOJEWSKI P. (1) ; LORENTZ S. (6) ; VALENTIN C. (7) ;
(1) IRD-BIOEMCO, School of Bioresources Engineering and Environmental Hydrology (BEEH), Univ. of KwaZulu-Natal, Scottsville, AFRIQUE DU SUD
(2) Dep. of Geography and Environmental Studies, Univ. of Stellenbosch, Matieland, AFRIQUE DU SUD
(3) UMMISCO, Univ.P&M Curie, Paris, FRANCE
(4) School of Biological and Conservation Sciences, Univ. of Kwazulu-Natal, Scottsville, AFRIQUE DU SUD
(5) IRD-BIOEMCO, Site Ecole Normale Supérieure, Paris, FRANCE
(6) School of Bioresources Engineering and Environmental Hydrology (BEEH), Univ. of Kwazulu-Natal, Scottsville, AFRIQUE DU SUD


The AA. used aerial photographs to study Acacia sieberiana encroachment and gully erosion in a South African grassland (KwaZulu-Natal Province) for a period lasting 64 years. At the catchment scale, results showed that acacias started invading after 1976 and transformed the grassland into a savanna with 9.45% of tree cover in 2009. Gully area increased by 3.9% in the last 64 years and represented 12.76% of catchment area in 2009. A positive correlation between gully retreat rate and Acacia canopy area was measured between 2001 and 2009 when established tree encroachment was observed. These results, associated with the susceptibility of this soil to subsurface flow and the observation of pipe erosion systems in the field, showed that both surface and subsurface processes occur in this sub-humid grassland and that trees can be indirectly associated with increased gully erosion


Article of periodic

published at : Catena / ISSN 0341-8162

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

Millesime : 2012, vol. 98 [pp. 110-119]

Bibliographic references : 2 p.

Collation : 6 fig., 5 tabl.



INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2012.07.002

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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