Some Properties of Astronium graveolens Wood Along the Stem

• Autor(a) principal: Longui,Eduardo Luiz
• Data de Publicação: 2016
• Outros Autores: Gondo,Cássia Christine Schmidt, Luiz de Lima,Israel, Freitas,Miguel Luiz Menezes, Florsheim,Sandra Monteiro Borges, Zanatto,Antonio Carlos Scatena, Garcia,José Nivaldo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Floresta e Ambiente
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-80872016000100142
• topic: hydraulic conductivity; strength of wood; guaritá; axial variation

ABSTRACT We investigated the axial variation of specific gravity, shear parallel to the grain and anatomical features of Astronium graveolens wood and related these properties to the anatomy along the stem. We felled five 20-year-old trees and cut discs from four different stem heights, including stem base, 1 meter, 2 meters and 3 meters, for a total of 20 discs, and studied wood samples near the bark and at the base of trunk. Axial variations found appear to provide a balance between mechanical strength of the wood at stem base by the higher density and higher shear by the increase in ray frequency that contributes to locking the vertical cells and growth rings, thus preventing the stem from easily breaking when bent. For hydraulic conductivity, vessels with smaller diameter and frequency at the stem base help prevent the occurrence of embolisms that would reduce water flow along the main stem.