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Madera y bosques

versão On-line ISSN 2448-7597versão impressa ISSN 1405-0471


PINEDA-HERRERA, Elizandro; PEREZ-OLVERA, Carmen de la Paz; DAVALOS-SOTELO, Raymundo  e  VALDEZ-HERNANDEZ, Juan Ignacio. Technological characteristics of two wood species from Costa Grande, Guerrero, México. Madera bosques [online]. 2012, vol.18, n.3, pp.53-71. ISSN 2448-7597.

The anatomical, physical, and mechanical features, and drying time of wood from Enterolobium cyclocarpum (Jacq.) Griseb. (Parota, Mimosoideae, Leguminosae) and Hura polyandra Baill. (Habillo, Euphorbioideae, Euphorbiaceae) collected in a semideciduous forest of Zihuatanejo de Azueta, Guerrero, Mexico, are described. For the anatomical description, pieces of 15 cm x 7 cm x 1 cm and slides 20 mm-thick, in transverse cross-section, tangential and radial directions and preparations of dissociated material were used. For the physical and mechanical tests small clear specimens of various dimensions, conditioned to a moisture content of 12%, were utilized. For each feature measured, univariate statistical analyses were performed and results were classified according to the mean. For air drying time tests, boards and prisms were placed in a stack with spacers between them. The species have medium diameter vessels, extremely low uniseriate rays, and medium length fibers of fine diameter. They differ in the number of pores and the length of the vessels, the number and width of rays, on the wall thickness of fibers and the width of the growth rings. For the physical properties, shrinkage values are low, except the radial shrinkage for E. cyclocarpum, which is very low. This species is dimensionally not stable whereas H. polyandra is highly stable. There are significant differences between species in the mechanical valules and the drying time.

Palavras-chave : Enterolobium cyclocarpum; Hura polyandra; deciduous tropical forest; air dried wood.

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