Agroforestry to combat desertification (a case study of the Sahel)

acacia acacia albida acacia senegal affectation de ressources africa africa de habla francesa africa south of sahara afrique afrique au sud du sahara afrique francophone afrique occidentale agroforesteria agroforesterie agroforestry animal husbandry methods arid climate aridoculture catastrophe naturelle clima clima arido climat climat aride climate climatic zones condiciones ambientales condition de milieu cropping systems crops cultivos desarrollo de recursos desarrollo rural desastres naturales desertification dicotiledoneas dicotyledons dry farming economic plants environment environmental conditions environnement feed crops feed legumes francophone africa gum plants human population industrial crops land use legumes leguminosae leguminosas leguminosas forrajeras mathematics medio ambiente methode methods mimosoideae natural disasters plantas plantas forrajeras plantas industriales plante plante de culture plante industrielle plants population population humaine population rurale resource allocation resource development rosales rural development rural population rural sociology sahel sistemas de cultivo site factors sociologia sociologia rural sociologie sociologie rurale sociology transhumance trashumancia tropical zones utilisation du sol west africa zona tropical zone climatique zone tropicale zootechnie zootechny zootecnia