TAILIEUCHUNG - Báo cáo lâm nghiệp:" Ring shake in chestnut: Anatomical description, extent and frequency of failures"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Ring shake in chestnut: Anatomical description, extent and frequency of failures" | Ann. For. Sci. 60 2003 403-408 INRA EDP Sciences 2003 DOI forest 2003032 403 Original article Ring shake in chestnut Anatomical description extent and frequency of failures Patrick FONTIa Nicola MACCHIONIb a WSL Swiss Federal Research Institute Sottostazione Sud delle Alpi via Belsoggiorno 22 Casella postale 57 6504 Bellinzona Switzerland b Istituto per la Valorizzazione del Legno e delle Specie Arboree Consiglio nazionale delle ricerche via A. Barazzuoli 23 50136 Firenze Italy Received 26 March 2002 accepted 21 November 2002 Abstract - Ring shake is a wood defect that occurs very frequently in sweet chestnut Castanea sativa Mill. . By examining this particular kind of wood failure it is apparent that at an anatomical level separations occurring in the wood tissue show different features. In order to collect further information to help in understanding the causes that lead to the development of ring shake a microscopic description and a quantification of these different ring shake typologies has been performed on 45 chestnut wood discs. Results showed that among the various shake types encountered the crack-form . the failure that develops across the earlywood cell walls is largely the most frequent and is principally found in fresh felled wood. Detailed observations reinforce the belief that the set off mechanism leading to crack-failure is related to the combined interaction of the structural weakness of chestnut wood with growth stresses developed in the stem. Castanea sativa ring shake fracture anatomy Résumé - La roulure du châtaignier description anatomique ampleur et fréquences des séparations. La roulure est un defaut du bois qui se produit très frequemment dans le châtaignier Castanea sativa Mill. . En examinant ce genre particulier de rupture il est visible au niveau anatomique que les separations qui se produisent dans le bois montrent des faciès de rupture differents. Afin de disposer d informations nécessaires à la comprehension des causes .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp