%0 Conference Proceedings
%9 ACTI : Communications avec actes dans un congrès international
%A De Noni, Georges
%A Viennot, Marc
%A Trujillo, G.
%A Custode, E.
%T Ruissellement et érosion sur des parcelles de cangahua réhabilitée (période 1994-1996)
%S Suelos volcanicos endurecidos
%C Quito (ECU) ; Quito (ECU) ; Quito (ECU) ; Quito
%D 1997
%E Zebrowski, Claude
%E Quantin, Paul
%E Trujillo, G.
%E Villamar, M.D.
%L fdi:010012922
%G FRE
%I UE ; ORSTOM ; PUCE ; UCE
%K EROSION ; CONSERVATION DU SOL ; RUISSELLEMENT ; PARCELLE DE CULTURE
%K CANGAHUA ; REHABILITATION DU SOL ; ZONE DE MONTAGNE
%K EQUATEUR ; ANDES
%P 331-342
%U https://www.documentation.ird.fr/hor/fdi:010012922
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/divers2/010012922.pdf
%W Horizon (IRD)
%X In the highlands of Ecuador, the response to an increase in alimentary needs leads to extend cultivable lands. Under these conditions, the reclamation of the pyroclastic hardened volcanic soils by mechanical woorks is a vital necessity. However the new soil material which has been roturated and disagregated, presents such a susceptibility that it becomes important to protect it against erosion. In order to offer sustainable alternatives, experimental studies have been undertook in two experimental stations located in the interandean valley next to Quito (2,500 - 2,900 m), in a subhumid to subarid climate with two dry seasons (2 to 4 months). The field experiment was carried out during 2 cultural years, in small runoff plots where daily runoff, erosion and rain have been measured. In oat plots, conservative cultural practices have been tested: acover with a pre-irrigated oat, a flat terrace, a pervious check dam with cangahua blocks, in comparison with a reference plot. On the reference plot, results swowed that erosion and runoff were important despite a weak erosivity (80<Rus<100); moreover, erosion hazards might occur at any time during the year. The cover effect was important and increased according to the development of the oat. As far as the erosion was concerned, weak erosion was observed between the treatments but these differences were significant when compared to the reference plot; the behaviour of the runoff was complex. The technique using previous check dams with cangahua blocks must be recommended for the good results it gave, its low cost and the easy acceptation by peasants. (Résumé d'auteur).
%B Suelos Volcanicos Endurecidos
%8 1996/12/9-14
%$ 068EROSOL