Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Modelling variability of within-ring density components in Quercus petraea Liebl. with mixed-effect models and simulating the influence of contrasting silvicultures on wood density Édith Guilley a. | 449 Ann. For. Sci. 56 1999 449 158 Inra Elsevier Paris Original article Modelling variability of within-ring density components in Quercus petraea Liebl. with mixed-effect models and simulating the influence of contrasting silvicultures on wood density Edith Guilleya Jean-Christophe Hervéb Franẹoise Hubera Gérard Nepveua Équipe de rechcrches sur la qualité des bois Centre Inra de Nancy 54280 Champenoux France bEquipe de dynamique des systèmes forestiers Engref Centre de Nancy 14 rue Girardet 54042 Nancy cedcx France Received 16 March 1998 accepted 3 February 1999 Abstract - Ring average density earlywood and latewood widths and densities were measured through microdensitometry on radial strips. The strips were sawn in two radii sampled at various heights from 82 oaks Quercus petraea Liebl. split into stands and regions 24 200 available rings . Mixed models were constructed with age from the pith and ring width as quantitative effects to determine which factors influence wood density components either region stand tree or position in commercial logs. The contribution to the total variability of each tested factor was then assessed. The next step consisted in evaluating the ring average density model established at breast height on a new sampling method. The ring average density model was finally used to simulate the influence of contrasting silvicultures on wood density the simulation including the between-tree variability for both density and radial growth. Inra Elsevier Paris. X-ray densitometry sessile oak mixed model simulation Resume - Modélisation de la variabilité des composantes intra-cerne de la densité du bois chez Quercus petraea Liebl. à 1 aide de modèles à effets mixtes et simulation des effets de sylvicultures contrastées sur la densité du bois. La densité moyenne les largeurs et densités du bois initial et final ont été mesurées par microdensitométrie sur des barrettes de bois. Les barrettes ont été pré-levées sur deux rayons et échantillonnées à .
