Population and sustainable land use in the Sahel. A study of carrying capacity and production systems

bosques burkina faso cash crops chad cultivated land cultivos alimenticios cultivos comerciales culture de rapport escasez de alimentos famine food crops forests ganado grazing lands livestock mali mauritania mauritanie natural resources niger nomadism nomadisme nomadismo pascicultura pastoralism pastoralisme plante alimentaire recursos naturales ressource naturelle sahel senegal tchad tierras de pastoreo