Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Heartwood and sapwood variation in Eucalyptus globulus Labill. trees at the end of rotation for pulpwood production. | Ann. For. Sci. 64 2007 665-671 INRA EDP Sciences 2007 DOI forest 2007045 Available online at Original article Heartwood and sapwood variation in Eucalyptus globulus Labill. trees at the end of rotation for pulpwood production Maria C. MORAlSa b Helena PERElRAa a Centro de Estudos Florestais Instituto Superior de Agronomia Universidade Técnica de Lisboa Tapada da Ajuda 1349-017 Lisboa Portugal b Departamento de Botânica Universidade de Coimbra Calẹada Martim de Freitas 3000-355 Coimbra Portugal Received 25 October 2006 accepted 15 February 2007 Abstract - The amount of heartwood and sapwood in Eucalyptus globulus Labill. wood was determined in commercial pulpwood plantations at harvest age 12 to 15 years in four ites in central portugal. twelve trees were sampled in each site at nine stem height levels. Heartwood was present in all the trees up to 82 -87 of the total tree height and amounted to 38 -41 of the total tree volume. The heartwood proportion in the stem cross-section decreased from the base upwards representing and of the total area respectively at the base and 55 height level. The sapwood width remained relatively constant along the stem at a mean 38 mm up to the 55 height level. The trees within the site the height level and their interaction were highly significant sources of variation for heartwood proportion and sapwood width. The heartwood diameter and sapwood width were positively correlated with radial tree growth. Eucalyptus globulus sapwood heartwood tree growth pulping Résumé - Variation du bois de creur et de l aubier de Eucalyptus globulus Labill. pour la production papetière. La quantité de bois de creur et d aubier dans les arbres d Eucalyptus globulus Labill. a été déterminée dans des plantations commerciales pour l industrie papetière à l âge de rotation 12 à 15 ans dans quatre sites au centre du Portugal. Douze arbres ont été prélevés dans chaque site à neuf niveaux. Chaque site est représenté par .
