DETERMINAÇÃO DAS DEFORMAÇÕES RESIDUAIS LONGITUDINAIS DECORRENTES DAS TENSÕES DE CRESCIMENTO EM Eucalyptus spp.

This study was carried out to determine the longitudinal residual strain (DRL) resulting from growth stress in standing trees, in different clones of Eucalyptus spp. Twelve clones of 9-year-Eucalyptus spp. were selected by basal area (G). From each clone, 12 trees of each clone were selected, and the following variables were measured: basic density (DB), bark thickness (EC), diameter at breast height (DBH) and total height (H). The measurements of DRL were performed in living trees, using an extensometer(Growth Strain Gauge), according to the CIRAD-Foret method. Readings were taken at four locations around the tree trunk. In relation to the levels of DRL, the results obtained in the study indicated that the clones showed large variations among themselves, presenting values considered high ones when compared with the results found in literature. The clone 8 was distinguished by having the lowest levels of strain and was considered as a suitable and recommended material for the production of solid wood and for breeding programs. On

[1]  G. Ceccantini.  Anatomia da madeira , 2012 .

[2]  Paulo Fernando Trugilho,et al.  Seleção de clones de Eucalyptus para as propriedades físicas da madeira avaliadas em árvores no campo , 2008 .

[3]  Paulo Fernando Trugilho,et al.  Deformação residual longitudinal (DRL) e tangencial (DRT) em seis clones de Eucalyptus spp. , 2006 .

[4]  Paulo Fernando Trugilho,et al.  DEFORMAÇÕES RESIDUAIS LONGITUDINAIS DECORRENTES DE TENSÕES DE CRESCIMENTO EM EUCALIPTOS E SUAS ASSOCIAÇÕES COM OUTRAS PROPRIEDADES 1 , 2004 .

[5]  J. E. Nicholson,et al.  A rapid method for estimating longitudinal growth stresses in logs , 1971, Wood Science and Technology.

[6]  Paulo Fernando Trugilho,et al.  DEFORMAÇÃO RESIDUAL LONGITUDINAL E SUA RELAÇÃO COM ALGUMAS CARACTERÍSTICAS DE CRESCIMENTO E DA MADEIRA EM CLONES DE EUCALYPTUS , 2003 .

[7]  José Nivaldo Garcia,et al.  Rendimento em madeira serrada de Eucalyptus urophylla , 2003 .

[8]  José Nivaldo Garcia,et al.  Tensão de crescimento e suas consequências, controláveis e não controláveis, no desdobro e secagem do Eucalyptus grandis e Eucalyptus saligna , 2001 .

[9]  José Nivaldo Garcia,et al.  Influência do desbaste nas tensões de crescimento de Eucalyptus grandis Hill ex-Maiden , 2000 .

[10]  A. R. Higa,et al.  Características da madeira de algumas espécies de eucalipto plantadas no Brasil , 2000 .

[11]  G. Palmer,et al.  Relationships between surface growth strain and some tree, wood and sawn timber characteristics of Eucalyptus cloeziana , 1999 .

[12]  José Nivaldo Garcia,et al.  Variação genética de indicadores de tensão de crescimento em clones de Eucalyptus urophylla , 1998 .

[13]  Professor Dr. Claus Mattheck,et al.  Wood - The Internal Optimization of Trees , 1995, Springer Series in Wood Science.

[14]  Masato Yoshida,et al.  Reduction of growth stress in logs by direct heat treatment : Assessment of a commercial-scale operation , 1997 .

[15]  John C. F. Walker.  Characteristics of stemwood and their manipulation , 1993 .

[16]  J. Ferrand.  Growth stresses and silviculture of eucalypts , 1983 .

[17]  J. V. Wyk.  Hardwood sawmilling can have a bright future in South Africa , 1978 .

[18]  A. Galvão.  Aspecto da utilização da madeira de eucalipto no Brasil: seu aproveitamento em serraria , 1976 .

[19]  H. Kubler,et al.  Stresses and checks in log ends from relieved growth stresses , 1973 .

[20]  J. Dinwoodie.  Growth Stresses in Timber—A Review of Literature , 1966 .

[21]  A. J. Panshin,et al.  Textbook of Wood Technology , 1964 .