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L\'etude de l\'influence des eclaircies sur la croissance en diametre d\'essences forestieres, apres 20 ans d\'experimentation, a permis de mettre en evidence l\'evolution de l\'effet traitement entre les parcelles traitees et les parcelles temoins. Pour les trois especes vegetales etudiees, seule Pouteria aningeria Baehni (Aniegre) observe a MOPRI, ne presente plus d\'effet traitement entre le traitement eclaircie moyenne et le traitement temoin. L\'eclaircie moyenne n\'a plus d\'effet sur cette espece a 20 ans. L\'effet traitement n\'a ete observe qu\'entre le traitement eclaircie forte et le temoin. Pour les deux autres especes, Triplochyton scleroxylon K. Schumm (Samba) et Tarriettia utilis (Sprague) Sprague (Niangon), les eclaircies (moyenne et forte) ont un effet sur la croissance. Cependant, pour les trois especes etudiees, on note qu\'entre les deux intensites d\'eclaircie (moyenne et forte), il n\'y a pas de difference significative. L\'etude de l\'accroissement diametrique, en fonction de la zone de plantation des especes, a permis de montrer que Scottelia klaineanavar. minfiensis (Gilg.) Pelligr (Akossika) presente une difference d\'accroissement significative entre les individus situes en zone de forets sempervirentes et ceux des forets semi-decidues. The study of the influence of the sunny spells on the growth in diameter of forest species, after 20 years of experimentation, allowed to see the evolution of treatment effect between treated and controls plots. For the three species studied, only Pouteria aningeria Baechni (Aniegre) observed at MOPRI does not present a treatment effect between the average sunny spell and the control. The average sunny spell didn't have anyeffect on this specie after 20 years. The treatment effect was apparent between the high sunny spell treatment and the control. For the two other species, Triplochyton scleroxylon K. Schumm (Samba) and Tarriettia utilis (Sprague) Sprague (Niangon), sunny spells (average and high) have an effect on growth. However, for the three species, there was no significant difference between the two intensities of sunny spell (average andhigh). The study of growth in diameter, show that Scottelia klaineana var. minfiensis (Gilg.) Pelligr (Akossika) presents a significant growth difference between individuals in rain-forest areas and those from semidecidious forests. Keywords : Traitement sylvicole, eclaircie, accroissement diametrique, essence forestiere. Agronomie Africaine Vol. 17 (2) 2005: pp. 91-102

Accroissement en diamètre d\'essences forestières au sein de trois périmètres expérimentaux (Mopri, Téné et Irobo) en Côte d\'Ivoire