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Báo cáo khoa học: "Indices de compétition en forêt dense tropicale humide : étude de cas sur le dispositif sylvicole expérimental de Paracou (Guyane française)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Indices de compétition en forêt dense tropicale humide : étude de cas sur le dispositif sylvicole expérimental de Paracou (Guyane française). | Ann. Sci. For. 55 1998 623-654 Inra Elsevier Paris 623 Article original Indices de competition en foret dense tropicale humide étude de cas sur le dispositif sylvicole experimental de Paracon Guyane frangaise Sylvie Gouriet-Fleury Cirad-Foret Programme Forets Naturelies BP 701 97387 Kourou cedex Guyane íranẹaise Reẹu le 9 aoũt 1996 accepté le 18 fevrier 1997 Abstract - Competition indices in a tropical moist forest trials on the sylvicultural experimental plots of Paracou French Guiana . The building of a single tree distance-dependent growth model using the data collected on the experimental plots of Paracou French Guiana led us to review numerous competition indices that have been used in temperate forests since 1950 and to discuss their applicability in moist tropical forests. We kept four simple indices calculated on tree-centered circular plots as well as their variation in time and studied their ability to predict diameter growth relative to sylvicultural treatments diameter class and species to which the subject tree belongs circular plot radius used to evaluate the indices. We show that their efficiency remains limited we could not explain more than 21 of the observed variance on mean annual diameter growth when all species are taken together the best results are obtained most often with a one-sided competition index for small diameter classes big plot radius at least 20 m and some light-demanding or canopy species. Inra Elsevier Paris. competition index diameter growth neighbourhood model moist tropical forest Resume - Dans le cadre de la mise au point sur le dispositif sylvicole de Paracou Guyane fran-ẹaise d un modèle de croissance d arbre dependant des distances nous avons passé en revue plu-sieurs indices de competition utilises en foret tempérée depuis les années 50 et envisage leur application au cas de la foret dense tropicale humide. Quatre indices simples calculés sur des pla-cettes circulaires centrées sur I arbre sujet ainsi que leur variation .