tailieunhanh - Báo cáo khao học: "Genetics of Eucalyptus wood properties."

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Genetics of Eucalyptus wood properties. | Ann. For. Sci. 59 2002 525-531 INRA EDP Sciences 2002 DOI forest 2002037 525 Review Genetics of Eucalyptus wood properties Carolyn A. Raymond CSIRO Forestry and Forest Products and Cooperative Research Centre for Sustainable Production Forestry GPO Box 252-12 Hobart TAS 7001 Australia Received 5 July 2001 accepted 5 March 2002 Abstract - Traditional methods of assessing wood properties are both destructive and expensive limiting the numbers of samples that can be processed. Over the past decade non-destructive sampling techniques and new assessment methods have been developed leading to a large increase in the numbers of trees and traits that can be evaluated. This technology has enabled the assessment of progeny trials to determine the patterns of variation degree of genetic control and economic importance of many wood traits leading to the inclusion of wood properties in many eucalypt-breeding programs. Issues addressed in this paper include the potential markets and products for plantation eucalypts leading to a definition of which wood properties should be assessed for a range of products. Current recommendations for non-destructive sampling for basic density fibre length and predicted pulp yield in Eucalyptus globulus and E. nitens are provided. Other non-destructive assessment techniques are illustrated including cellulose content acoustic testing methods for wood stiffness and SilviScan X-ray densitometry and diffraction analysis for density and microfibril angle. The degree of genetic control for wood properties is compared to tree growth traits and a series of issues and challenges for the future presented. eucalypt breeding wood quality genetic parameters non-destructive sampling Résumé - Génétique des propriétés du bois d Eucalyptus. Les méthodes traditionnelles pour déterminer les propriétés du bois sont à la fois destructives et chères limitant le nombre d échantillons pouvant être étudiés. Au cours des décennies passées les techniques d .