TAILIEUCHUNG - Báo cáo lâm nghiệp: "Modelling branchiness of Corsican pine (Pinus with mixed-effect models nigra Arnold ssp. laricio (Poiret) Francis"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Modelling branchiness of Corsican pine (Pinus with mixed-effect models nigra Arnold ssp. laricio (Poiret) Francis. | Ann. Sci. For. 55 1998 359-374 Inra Elsevier Paris 359 Original article Modelling branchiness of Corsican pine with mixed-effect models PÙUIS nigra Arnold ssp. laricio Poiret Maire Céline Meredieua Francis Colinb Jean-Christophe Hervéc Division écosystèmes forestiers et paysage Cemagref domaine des Barres 45290 Nogent-sur-Vernisson France bUnité croissance production et qualité du bois Inra Nancy 54280 Champenoux cedex France. cEquipe dynamique des systèmes forestiers Engref Inra 14 rue Girardet 54042 Nancy cedex France Received 20 May 1997 accepted 15 December 1997 Abstract - In order to predict the influence of silvicultural practices on knottiness and canopy structure models were constructed to predict branch characteristics of Corsican Pine Pinus nigra Arnold ssp. laricio Poiret Maire var. Corsicana from usual tree measurements. Thirty-six trees were sampled from a broad range of age stand density and site index. Mixed models were fitted on branch length and on branch angle after a linearization procedure. A segmented second order polynomial model was chosen for the diameter profile. Nevertheless this model seemed difficult to be transformed for fitting mixed models but a global model was however satisfactory. For realistic simulations with these models we generated simulated correlated residuals of angle and diameter in order to maintain the negative link between angle and diameter of a branch. The mixed model method provides an improvement of the fit by accounting for inter-tree differences and or intra-tree similarities and also an improvement of the simulation. The possibility to fit mixed-effect non-linear models allows a great number of models. Inra Elsevier Paris. branchiness Pinus nigra ssp. laricio I modelling mixed model simulation Resume - Moderation de la branchaison du pin laricio à 1 aide de modèles à effets mixtes Pinus nigra Arnold ssp. laricio Poiret Maire . Dans le but final de prévoir rinfluence de la sylviculture sur la nodosité et le .

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