Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Optimization of multiple trait selection in western hemlock (Tsuga heterophylla (Raf.) Sarg.) including pulp and paper properties. | Ann. For. Sci. 59 2002 577-582 INRA EDP Sciences 2002 DOI forest 2002043 577 Original article Optimization of multiple trait selection in western hemlock Tsuga heterophylla Raf. Sarg. including pulp and paper properties Milosh Ivkovich and Mathew Koshy Department of Forest Sciences University of British Columbia Vancouver BC V6T1Z4 Canada Received 5 July 2001 accepted 14 January 2002 Abstract - Options for incorporating wood quality in British Columbia s hemlock breeding program were investigated. Seventy half-sib families were examined. Attention was given to quantitative variation in tracheid characteristics and its effects on pulp and paper properties. Based on the existing knowledge of relationships between fibre properties and paper quality the potential gain in yield and wood quality was estimated for different selection strategies. Improvement without much trade-off was possible for volume and tensile strength of pulp and paper. Significant trade-offs would be required to improve the volume tear strength of paper and strength of mechanical pulp. Therefore multiobjective optimization would be beneficial. Conservative selection strategies seem realistic and compromises with gain in volume growth may be profitable. The potential loss arising from the uncertainty about economic values for objectives can be overcome by using different selection indices in multiple breeding populations. Tsuga heterophylla wood quality index selection breeding optimization Résumé - Optimisation de la selection multi-caractères pour les propriétés de la pâte et du papier chez Tsuga heterophylla Raf. Sarg. . Nous avons étudié plusieurs strategies d introduction de la qualité du bois dans le programme d amelioration génétique de Tsuga heterophylla en Colombie Britannique. Soixante-dix familles de demi-frères ont été examinées. Nous avons observé la variation quantitative des caractéristi-ques des trachéides et analysé ses effets sur les propriétés de la pâte et du papier. En .
