TAILIEUCHUNG - Báo cáo lâm nghiệp: "Coloration macroscopique, retraits longitudinaux de maturation et de séchage du bois de tension du peuplier (Populus x euramericana cv I.214)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Coloration macroscopique, retraits longitudinaux de maturation et de séchage du bois de tension du peuplier (Populus x euramericana cv ). | 1083 Ann Sci For 1996 53 1083-1097 Elsevier INRA Article original Coloration macroscopique retraits longitudinaux de maturation et de séchage du bois de tension du peuplier Populus X euramerícana cv V Grzeskowiak1 F Sassus1 M Fournier2 1 Laboratoire de mécanique et de génie civil équipe Bois cc 081 université de Montpellier-Il place Eugène-Bataillon 34095 Montpellier cedex 5 zEngref BP 5093 34033 Montpellier cedex France Reẹu le 30 mars 1995 accepté le 1er décembre 1995 Summary - Macroscopic staining longitudinal shrinkage and growth strains of tension wood of poplar Populus X euramericana cv . This study aims at characterizing distribution and properties of tension wood of poplar clone . First the use of zinc chloroiodide for the macroscopic staining of tension wood was validated for poplar. Then longitudinal growth strain and axial shrinkage were measured for both normal and tension wood. The staining revealed fine tangential strips of tension wood closely corresponding to G fibres on microscopic slides fig 5 . The tension wood content quantified by the stained surface ratio was weakly correlated to the measurement of the longitudinal strain fig 6 . Tension wood shrinkage was greater than that of normal wood vs table IV . Macroscopic staining evidenced rapid variations of wood structure within the transverse plane this was confirmed by shrinkage measurements figs 8 and 9 . Moreover rapid variations of longitudinal shrinkage along the fibre direction was observed probably due to the location of our samples at the base of a fork. Populus X euramericana cv tension wood growth stresses drying shrinkage Resume - L objectif est d etudier la repartition et les propriétés du bois de tension du clone de peupller . Dans un premier temps nous avons validé le chloro-iodure de zinc comme colorant macrosco-pique du bois de tension. Par la suite nous avons caractérisé la deformation longitudinale de maturation à I origine des contraintes de

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