Modelling number, vertical distribution, and size of live branches on coniferous tree species in British Columbia

摘要: A compound, nonhomogeneous Poisson process was used to model the number, vertical distribution, and size of branches on four coniferous tree species: 134 western hemlock (Tsuga heterophylla (Raf.) Sarg.) six sites, 45 amabilis fir (Abies Douglas ex J. Forbes) (three sites), 60 lodgepole pine (Pinus contorta var. latifolia Engelm. S. Watson) (six white spruce (Picea glauca (Moench) Voss) trees (five sites) two varieties: 66 coastal Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) 50 interior (Mayr) (four sites). Branches these species are typically more or less clustered have a characteristic, nonuniform distribution along annual shoots. Total number relative positions clusters varied with shoot age. Clustering patterns in three varieties appeared scale proportionally length. However, pine, which has fewer per metre cluster, shoots ≤5 years old consistent gamma-Poisson but converged proc- ess >5 old. Separate mixed-effect regression models were developed for each relating length diameter live (crown), shoot, branch (cluster) predictor variables. Resume : Un processus de non homogene ou compose ete utilise pour modeliser le nombre, la verti- cale et dimension des quatre especes coniferes pruches l'Ouest dans stations, sapins gracieux (trois stations), pins tordus latifolies stations) epiceas blancs (cinq sta- tions) deux varietes douglas vert bleu (quatre stations). Les ces sont typi- quement plus moins regroupees ont une verticale uniforme caracteristique long pousses annuel- les. Le nombre total position faisceaux variaient selon l'âge pousse. patron regroupement chez trois les semblait varier proportionnellement avec longueur Cepen- dant, pin tordu, qui possede par faisceau, ans suivait un modele gamma mais convergeait vers ans. Des modeles distincts effet mixte reliant diametre vivantes aux variables explicatives l'arbre (cime), (faisceaux) elabores chaque espece. (Traduit Redaction)