tailieunhanh - Báo cáo khoa học: "Relations entre caractéristiques de retrait et densité du bois chez le pin sylvestre, le sapin pectiné et l’épicéa commun"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Relations entre caractéristiques de retrait et densité du bois chez le pin sylvestre, le sapin pectiné et l’épicéa commun. | Ann Sci For 1991 48 87-100 Elsevier INRA 87 Article original Relations entre caractéristiques de retrait et densité du bois Chez le pin Sylvestre le sapin pectiné et répicéa commun JF Mazet 1 G Nepveu 2 ONF DR Lorraine 5 rue Girardet 54000 Nancy 2 INRA station de recherches sur la qualité des bois Champenoux 54280 Seichamps France Reẹu le 12 mars 1990 accepté le 23 novembre 1990 Résumé Des relations entre les caractéristiques de retrait du bois et son intradensité sont re-cherchées pour le sapin pectiné répicéa commun et le pin Sylvestre. Les échantillons utilises sont des carottes de sondage de 5 mm de diamètre prélevées sur un ensemble de 928 arbres. Les relations obtenues sont significatives mais restent cependant faibles. Le retrait radial est toujours mieux lié à riníradensité que le retrait tangentiel. L introduction d autres variables telles que la largeur moyenne de cerne râge et la circonference de I arbre n ameliore pas de manière significative les relations mises en evidence. Pinus sylvestris I Abies alba I Picea abies retrait du bois infradensite Summary Relationships between wood shrinkage properties and wood density for Scots pine silver fir and Norway spruce. Relationships between basic wood density tree circumference age and wood shrinkage properties were investigated. Increment cores were used from 928 trees the number of trees sampled for each species is given in table I. The location of the stands in the Vosges 1 department is given in figure 1. The shrinkage coefficients representing the dimensional variation of wood when Its moisture content decreases by 1 were calculated. The compression wood was taken into account as it influences the shrinkage coefficient values table II . The results of the 3 species were compared table III pine wood had the highest values the values for fir and spruce were identical. The relationship between the different shrinkage coefficients was also investigated table V . In order to study shrinkage variability a .