Rôle du bétail dans le cycle culture-jachère en région soudanienne : la dissémination d'espèces végétales colonisatrices d'espaces ouverts (Bondoukuy, sud-ouest du Burkina Faso).
Résumé
The dispersal of seeds by cattle on fallows was assessed in a sudanian region of West Africa. All the feces were collected in four stands during two years from March 1994 to May 1996 and seeds were manually extracted. Cow dungs represent the main part of ail the feces collected. They were found on fallows mainly during the dry season when the cultivated area is open to cattle grazing. Cattle disperse weeds and some woody species that are in majority leguminous . Species diversity in dung is low and only some species such as Borreria stachydea, a weed, or Gardenia erubescens, a shrub, constitute the greater part of the seeds dispersed by cattle. Seed content of dung varies along the year; it is high from November to March and low in October, April and May and during the wet season. Weeds are dispersed by cattle during the whole dry season but are especially abundant from December to February when woody species arc mainly dispersed from January to March . Cattle acts principally as a disperser of species that colonize open habitat and play a role in the successions of vegetation that occur during the fallow-cultivation cycle.
Domaines
Ecologie, Environnement
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