tailieunhanh - Báo cáo khoa học: "Variation of pulpwood quality with provenances and site in Eucalyptus globulus"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Variation of pulpwood quality with provenances and site in Eucalyptus globulus. | Ann. For. Sci. 59 2002 283-291 INRA EDP Sciences 2002 DOI forest 2002024 283 Original article Variation of pulpwood quality with provenances and site in Eucalyptus globulus Isabel Miranda and Helena Pereira Centro de Estudos Florestais Instituto Superior de Agronomia Tapada da Ajuda 1349-017 Lisboa Portugal Received 20 November 2000 accepted 23 November 2001 Abstract - Differences in basic wood density fibre morphology chemical composition and pulp yield were studied among 4 provenances of Eucalyptus globulus planted in trials at three sites. Sampling was carried out at the age of 9 years. Provenances and site were not found to have a significant effect on wood density. Fibre length increased radially from pith to bark with a pattern similar for all provenances. Provenance and site were significant sources of variation for fibre length cell wall thickness and lumen diameter. At the worst growth quality site fibres were shorter with thicker cell walls and smaller lumen diameter. In relation to chemical composition only extractives showed within tree variation and significant provenance and sites effects. Pulp yield ranged from to at Kappa numbers from to with provenance a highly significant influencing factor. Eucalyptus globulus wood density fibre biometry chemical composition pulp yield provenance variation site variation Résumé - Influence de la provenance et du site dans la qualité papetière du bois de Eucalyptus globulus. La densité du bois mor-phologie des fibres composition chimique et rendement en pâte ont été analysés sur rondelles à 1 30 m de hauteur de 5 arbres de 4 provenances de Eucalyptus globulus de 9 ans en trois régions différentes. La provenance et le site n ont pas influencé significativement la densité du bois. La longueur des fibres augmente radialement du creur à la périphérie avec une variation similaire pour toutes les provenances. La provenance et le local ont été des facteurs significatifs de la variation de la .