tailieunhanh - Báo cáo lâm nghiệp: "A method for multiple intra-ring demarcation of coniferous trees"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "A method for multiple intra-ring demarcation of coniferous trees" | 9 Ann. For. Sci. 63 2006 9-14 INRA EDP Sciences 2006 DOI forest 2005093 Original article A method for multiple intra-ring demarcation of coniferous trees Young-In David Park Guillaume Dallaire Hubert Morin Département des Sciences fondamentales Université du Québec à Chicoutimi 555 boulevard de l Université Saguenay Québec Canada Received 1 December 2004 accepted 28 September 2005 Abstract - Earlywood E and latewood L are arbitrary concepts by consequence the E L demarcation method is as well. The threshold method has been widely used in wood anatomy as well as wood density. Because of the presence of the intra-annual variation in tree-ring structure however the conventional threshold method needs adjustment in an objective and effective way. We suggest the analysis of the error zone method for this adjustment. The method was tested with 500 radial cell files of mature balsam fir and showed its potential as an objective robust and easily applicable adjustment tool. multiple intra-ring demarcation intra-ring variation wall-lumen ratio Mork s definition wood anatomy Résumé - Une méthode pour la demarcation intra-cerne multiple de conifere. Le bois initial et le bois final sont des concepts arbitraires de même que leur démarcation. La méthode de seuil est appliquée généralement dans le domaine de l anatomie et de la densité du bois. Mais la méthode conventionnelle du seuil nécessite des ajustements parce qu il y a des variations dans la structure du cerne. Nous suggérons la méthode de l analyse de la zone d erreur pour effectuer cet ajustement. La méthode suggérée a été vérifiée avec 500 files radiales de cellules de sapin baumier matures et elle a démontré son potentiel comme un moyen objectif robuste et facile à appliquer. demarcation intra-cerne multiple variation intra-cerne ratio parois-lumen definition de Mork anatomie du bois 1. INTRODUCTION Earlywood E and latewood L demarcation for conifers is generally based on the wall-lumen W L relation of cells. .