Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Relationships between stem size and branch basal diameter variability in Norway spruce (Picea abies (L.) Karsten) from two regions of France. | Ann. For. Sci. 61 2004 525-535 INRA EDP Sciences 2004 DOI forest 2004047 525 Original article Relationships between stem size and branch basal diameter variability in Norway spruce Picea abies L. Karsten from two regions of France Michel Loubère Laurent Saint-André Jean-Christophe Hervé Geir Isaak VEST0L Resource Forest and Wood Research Laboratory ENGREF-INRA Nancy France Received 3 September 2002 accepted 12 January 2004 Abstract - Statistical relationships between branch basal diameter of living whorls stem size height and diameter at breast height and stand parameters stand age site class were analysed in Norway spruce. The first experimental sample used to calibrate a model consisted of 98 trees from young to old stands growing in Lorraine Eastern part of France . Every second whorl branch basal diameter was measured and a regression model was established for the living branches. Basal diameter variance components were estimated by a non-linear mixed model analysis. Results confirmed the close statistical relationships between branch basal diameter tree size and stand parameters whereas covariance analysis revealed significant random fluctuations among whorls and trees. Every third whorl branch basal diameter of 36 Norway spruce trees growing naturally in Midi-Pyrénées was used for the second analysis. Applying the model to these trees showed a good stability of the statistical relationship between the two regions. branch diameter Norway spruce wood quality Lorraine Midi-Pyrénées Résumé - Relation entre la taille des tiges et le diamètre basal des branches pour l épicéa commun Picea abies L. Karsten de deux regions de France. On a étudié la relation statistique entre le diamètre des branches verticillaires vivantes la taille de la tige hauteur et diamètre et les mesures de peuplement âge du peuplement indice de fertilité chez l épicéa commun. Pour établir le modèle 98 arbres ont été échantillonnés en Lorraine. Le diamètre des branches verticillaires a
