Variabilidade radial e longitudinal de propriedades da madeira de angico-vermelho (Anadenanthera peregrina (L.) Speg.)

• Autor(a) principal: Teixeira, Brígida Maria dos Reis
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2981
• topic: Variabilidade radial; Variabilidade longitudinal; Propriedades da madeira; Angico-vermelho; Radial variability; Longitudinal variability; Wood properties; Anadenanthera peregrina; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS

The objective of this work was to determine the variability in the radial and longitudinal directions of some properties of the angico-vermelho (Anadenanthera peregrine (L.) Speg.) wood, from an area of native forest, located in the campus of the Universidade Federal de Viçosa, State of Minas Gerais, Brazil. The specific mass (basic and apparent), retractility, compression, shearing, Janka hardness and static bend mechanical resistance (MOR and MOE), were determined according to the norm NBR 7190 (ABNT, 1997) and ABNT MB-26 (1940) rule. The anatomical properties were determined according to the norm COPANT (1974) rule. Some dendrometrical variables associated with the logs were also evaluated. Seven trees were used, of unknown age, chosen at random in the field, with similar diameters at breast height (DBH). The results, by the Tukey test at 5% significance, showed that there an significant differences between the positions, in the pith-bark direction. These differences were observed among the logs, in the base-top direction, for the majority of the properties studied. A tendency of increase of the fibers length, on the wall thickness, on the basic and apparent specific mass, on the tangential retraction, radial retraction, on the volumetric retraction, on the compression resistance, on the shearing, on the hardness on the radial, tangential and cross sections, and on the rupture and elasticity modules on the radial direction, in the pith-bark orientation was observed. The fiber width and the lumen diameter showed a decrease in the same orientation. A clear tendency of variation in the radial direction, for the longitudinal retraction and for the anisotropic factor was not observed. A tendency of the decrease on the basic and apparent specific mass, on the compression resistance, on the shearing, on the hardness on the radial and cross sections was observed, as well as on the rupture and elasticity modules in the longitudinal direction, on the base-top orientation. A clear tendency of longitudinal variation, on the base-top orientation, for the fiber length, fiber width, lumen diameter, wall thickness, tangential retraction, radial retraction, volumetric retraction, longitudinal retraction, anisotropic factor and hardness on the tangential plane, was not observed.