Silvicultural, botanical and technological characterization of the eucalyptus urophylla s. t. blake and its potential use in sawmill.

Author(s)

Laerte Scanavaca Junior

• Document type: Master's Dissertation
• Press: Piracicaba.
• Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
• Defense date: 2002-01-30

Examining board members

Jose Nivaldo Garcia; Mario Ferreira; Antonio Augusto Franco Garcia

• Advisor: Jose Nivaldo Garcia

Abstract

The eucalypts is a gender that should be more used at sawmills in Brazil, due to its fast growth, great wooden abundance, easiness and low cost in the exploration, wood relatively homogeneous, proximity to the consumer market and cheap price. The Eucalyptus urophylla is a species of high potential for the humid tropical zones, because of its tolerance to the eucalypts canker (Cryphonectria cubensis) and due to its great plasticity of adaptation for the most diverse uses. It is one of the most planted species in Brazil, with great potential to be used in sawmill. The objective of this work is to study the botanical and silvicultural features, and the physical and mechanical properties of the wood of provenances/progenies of Eucalyptus urophylla from the Flores island with 19 years of age. Six trees of 20 progenies had been selected, totaling 120 trees. There was not statistical differences among the origins or progenies for the productivity (DBH, height and cylindrical volume of the trees). It had statistic difference between progenies for the morphological features, like the leaves and the fruits, but the amplitude of variation presented was inside the limits defined for the species. About the study of the physical and mechanical properties, there was no statistic differences among the progenies, except for the volumetric shrinkage. The progenies were classified like the high mechanical resistance, except for the compression, that was of average resistance, high shrinkage and moderately weighed. There was good correlation between the basic density, that is easy to determination, and the mechanical properties of the wood, what allow to conclude that it is possible to predict the resistance to static flexion through the basic density. There was no correlation between end splitting log with end splitting board. There also were no correlations between the growth tensions and the diameter of the logs. The taper didn't influence the income in sawed wood. The medium income in sawed wood was of 42,5%. (AU)