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Le probleme predominant auquel est confronte le Departement de Barh-Koh reside dans l’approvisionnement en bois energie et de service ou la demande a largement depasse la capacite de production du milieu naturel. Le present travail a eu pour objectifs de caracteriser les ressources ligneuses ; quantifier les besoins en bois de feu et de service et analyser les filieres d’approvisionnement en vue d’une utilisation rationnelle et durable de ressources forestiere de la zone d’etude. Nous avons base la methode de la recherche sur l’inventaire des ressources ligneuses et les enquetes socio-economiques de terrain. Les releves effectues ont permis d’identifier 134 especes ligneuses reparties en 92 genres et 39 familles. Une densite moyenne de 16 arbres / ha correspondant a une surface terriere moyenne de 0,5 m 2 / ha a ete obtenue. La repartition par classes de diametre des ligneux releve une predominance des individus de petit diametre. La regeneration naturelle atteint une densite elevee de l’ordre de 65 pieds / ha. Les enquetes socio-economiques de terrain conduites dans les 9 cantons ont revele une consommation moyenne en bois de chauffe de 1,07 kg / habitant / jour, ce qui represente un besoin annuel de 394 kg / habitant soit 1,12 steres. L’estimation du bois utilise pour la construction des cases a permis de determiner un besoin moyen de 0,10 ± 0,02 m 3 de bois. Les resultats d’enquete montrent aussi que le revenu moyen et mensuel des exploitant est faible et sensiblement egal a 72% du SMIG, soit 43 200 FCFA. Ainsi, l’amenagement forestier permettra d’ameliorer de maniere significative l’approvisionnement en bois de chauffe et de service aux populations. © 2018 International Formulae Group. All rights reserved. Mots cles: Degradation, ressources forestiere, bois energie, regeneration, amenagement, approvisionnement English Title:  Assessment of timber resources and their exploitation as firewood and service in the Barh-koh Department in southern Chad English Abstract The predominant problem facing the Barh-Koh Department is the supply of wood energy and service where demand has largely exceeded the production capacity of the natural environment. The purpose of this work was to characterize woody resources; quantify firewood and service requirements and analyze supply chains for the rational and sustainable use of forest resources in the study area. We have based the method of research on the inventory of wood resources and socio-economic field surveys. The surveys made it possible to identify 134 woody species divided into 92 genera and 39 families. An average density of 16 trees / ha corresponding to an average basal area of 0.5 m 2 / ha was obtained. The diameter distribution of ligneous species indicates a predominance of small diameter individuals. Natural regeneration reaches a high density of about 65 feet / ha. Socio-economic field surveys conducted in the 9 cantons revealed an average fuel wood consumption of 1.07 kg / inhabitant / day, which represents an annual requirement of 394 kg / inhabitant or 1.12 steres. The estimate of the wood used for the construction of the huts made it possible to determine an average need of 0.10 ± 0.02 m 3 of wood. The survey results also show that the average and monthly income of the operators is low and substantially equal to 72% of the SMIG, that is to say 43,200 FCFA. Thus, forest management will significantly improve the supply of firewood and services to the population. © 2018 International Formulae Group. All rights reserved. Keywords: Degradation, forest resources, wood energy, regeneration, development, supply

Evaluation des ressources ligneuses et leur exploitation comme bois de chauffe et de service dans le Département de Barh-kôh au sud du Tchad