Resumos
Neste trabalho apresentamos os resultados dos estudos das diferenças entre as dimensões (comprimento, diâmetro e espessura) das fibras lenhosas nos anéis de crescimento (da periferia ao centro do fuste), determinadas ao nível do D. A. P. (distância a altura do peito) e em diferentes níveis (10%, 20% e 30% da altura do fuste) de árvores adultas de Eucalyptus saligna Smith, tendo como objetivo verificar se em nossas condições, as amostras tomadas apenas no D. A. P. representam o fuste da árvore.
This paper deals with the variation of fiber dimentions in growth rings taken at the breast height (B.H.) and at three aditional level of trunk height (10%, 20% and 30% of total height) of two plants of Eucalyptus saligna Smith. Statistical analyses of variance for fiber length, fiber diameter and fiber thikness in diferent growth rings at B.H., 10%, 20% and 30% of trunk height is prsented. Analysis of variance allowed the following conclusion: 1° - Significant diferences were observed for fiber dimentions mean, taken at B.H. and those taken at the levels of 10%, 20% and 30% of trink height; 2° - In any growth rings along the trunk, the fiber length means increased consistently from B.H. to the levels of 10%, 20% and 30% of trink height, however the means for fiber diameter and thikness of the wall decreace from the B.H. point to the leves of 10%, 20% and 30% of trink height; 3° - The results obtained in the present study confirm those obtained by BISSET & DASDWELL (1949) in that the maximum fiber lenght is reached at aproxmately one third of the total height of the trink and also confirm the afirmation made by RUDMAN et al (1969) that the samples taken at the B.H. level are inadequate for qualitative wood studies, specially in raltion with forest genetics investigation.
Clóvis F. O. SantosI; Izaias R. NogueiraII
IDepartamento de Botânica da ESALQ
IIDepartamento de Matemática e Estatística da ESALQ
RESUMO
Neste trabalho apresentamos os resultados dos estudos das diferenças entre as dimensões (comprimento, diâmetro e espessura) das fibras lenhosas nos anéis de crescimento (da periferia ao centro do fuste), determinadas ao nível do D. A. P. (distância a altura do peito) e em diferentes níveis (10%, 20% e 30% da altura do fuste) de árvores adultas de Eucalyptus saligna Smith, tendo como objetivo verificar se em nossas condições, as amostras tomadas apenas no D. A. P. representam o fuste da árvore.
SUMMARY
This paper deals with the variation of fiber dimentions in growth rings taken at the breast height (B.H.) and at three aditional level of trunk height (10%, 20% and 30% of total height) of two plants of Eucalyptus saligna Smith.
Statistical analyses of variance for fiber length, fiber diameter and fiber thikness in diferent growth rings at B.H., 10%, 20% and 30% of trunk height is prsented.
Analysis of variance allowed the following conclusion:
1° - Significant diferences were observed for fiber dimentions mean, taken at B.H. and those taken at the levels of 10%, 20% and 30% of trink height;
2° - In any growth rings along the trunk, the fiber length means increased consistently from B.H. to the levels of 10%, 20% and 30% of trink height, however the means for fiber diameter and thikness of the wall decreace from the B.H. point to the leves of 10%, 20% and 30% of trink height;
3° - The results obtained in the present study confirm those obtained by BISSET & DASDWELL (1949) in that the maximum fiber lenght is reached at aproxmately one third of the total height of the trink and also confirm the afirmation made by RUDMAN et al (1969) that the samples taken at the B.H. level are inadequate for qualitative wood studies, specially in raltion with forest genetics investigation.
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LITERATURA CITADA
Entregue para publicação em 9/10/1974.
- BISSET, L. J., and DASDWELL, H. E. - 1949 - The variation of fiber length within one tree of Eucalyptus regnan Australian Forestry 13(12): 86-96.
- CARVALHO, A. 1962 - Madeira de Eucalipto. Lisboa, Est. e Div. Tec. Serviços Florestais. 62 pgs.
- MOTTET, A. 1965 - Considerations on the relationship betwen certain anatomical characteristics and density in tropical woods. Proceedings IUFRO - Section 41. 2 :1-14.
- RUDMAN, P.; HIGGS, M.; DAVIDSON, J.; and MALAJCZURK, N. 1969 - Breeding eucalyptus for wood properties. In: WORLD CONSULTATION ON FOREST TREE BREEDING, 2., Washington. Voluntary paper. Rome, F.A.O/ IUPRO, Sect. II, p. 1-9.
- SANTOS, Clóvis Ferraz de Oliveira & NOGUEIRA, Isaias Rangel. 1971 - A idade adulta do Eucalyptus saligna Smith, em Rio Claro, Estado de São Paulo, determinada pelas dimensões das fibras. Anais da Escola Superior de Agricultura «Luiz de Queiroz», Piracicaba, 28:165-175.
- ZOBEL, B., - (s/ data) - Wood quality improvement through better trees. Raleigh, North Carolina State University, School of Forestry, 6 pgs.
- ZOBEL, B., 1961 - Juvenility in Wood Production. (Problems in forest tree Breeding). Recent advances in Botany. 2: 1663-1665.
Diferenças entre as dimensões das fibras nos anéis de crescimento determinados no D. A. P. e em níveis diferentes do fuste de árvores adultas de Eucaliptus saligna Smith
Datas de Publicação
-
Publicação nesta coleção
29 Maio 2012 -
Data do Fascículo
1974
