ESTIMATING THE AGE OF DEMARCATION OF JUVENILE AND MATURE WOOD IN Luehea divaricata Mart.
DOI:
https://doi.org/10.5902/19805098436Keywords:
juvenile and mature wood, anatomical characteristics, age of demarcation.Abstract
This study aimed at determining the age of demarcation of juvenile and mature wood of Luehea divaricata Mart., using anatomical characteristics. Three adult trees, in good trunk, with diameter at DBH larger than 30 cm, from Encosta Superior do Nordeste do Estado do Rio Grande do Sul, were selected. Discs with thickness of 2 cm at 0.1 m of height from the base of the trunk were used. From each disc a radial ribbon 2 cm wide including the pith was removed. The initial wood of each growth ring was separated for maceration (method of Jeffrey). There were measured length and diameter of thirty fibers from each growth ring. Demarcation of the two types of wood was defined by the radial variation (pith-bark) of the anatomical characteristics (length, diameter, width of the lumen and wall thickness of fibers), using simple linear regression. Results indicate that fiber length is the best characteristic, while fiber diameter, lumen width and wall thickness were considered inadequate for demarcation. The age of demarcation of juvenile and mature wood of Luehea divaricata was defined as 21 years-old, approximately.
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ABDEL-GADIR, A.Y.; KRAHMER, R. L. Estimating the age of demarcation of juvenile and mature wood in Douglas-fir. Wood and Fiber Science, v. 25, n. 3, p. 242-249, 1993.
ASTM. American Society for Testing and Materials. Standard practice for sampling forest trees for determination of clear wood properties: ASTM D5536-94. Philadelphia, PA: 1995.
BENDTSEN, B. A., Properties of wood from improved and intensively managed trees. Forest Products Journal, v. 28, n. 10, p. 69-72, 1978.
BENDTSEN, B. A.; J. SENFT. Mechanical and anatomical properties in individual growth rings of plantation-grown cottonwood and loblolly pine. Wood Fiber Science, v. 18, n. 1, p. 23-28. 1986.
BROWN, M. J.; McWILLIAMS, W. H. Pine stands across the South - trends and projections. In: SOUTHERN PLANTATION WOOD QUALITY WORKSHOP, 1989, Athens. Proceedings… Asheville: Southeastern Forest Experiment Station, United States Department of Agriculture, 1990. p. 1-15.
BURGER, L. M.; RICHTER, H. G. Anatomia da Madeira. São Paulo: Ed. Nobel, 1991. 154p.
CLARK, A.; SAUCIER, J. R. Influence of initial planting density, geographic location, and species on juvenile formation in souther pine. Forest Products Journal. V. 39, p. 42-48, 1989.
COPANT, Comision Panamericana de Normas Técnicas. Selección y colección de maderas, COPANT 30:1-001, 1971.
COWN, D. J. Corewood (Juvenile wood) in Pinus radiata – should we be concerned?. New Zealand Journal of Forestry Science, v. 22, n. 1, p. 87-95, 1992.
GATTO, D. A. Características tecnológicas do vergamento das madeiras de Luehea divaricata, Carya illinoinensis e Platanus x acerifolia como subsídios para o manejo florestal. 2006. 109f. Tese (Doutorado em Engenharia Florestal) – Universidade Federal de Santa Maria, Santa Maria, 2006.
LARSON, P. R. The physiological basis for wood specific gravity in conifers. In: IUFRO Division 5 meeting, v. 2, Stellenbosch, 1973. Proceedings… Stellenbosch, 1973. p. 672-680.
LOO, J. A.; TAUER, C. G.; MCNEW, R. W. Genetic variation in the time of transition from juvenile to mature wood in loblolly pine (Pinus taeda L.). Silvae Genetetica, v. 34, n. 1, p. 14-19, 1985.
MUÑIZ, G. L. B. Caracterização e desenvolvimento de modelos para estimar as propriedades e o comportamento na secagem da madeira de Pinus taeda L.. 1993. 126f. Tese (Doutorado em Ciências Florestais) - Universidade Federal do Paraná, Curitiba, 1993.
PANSHIN, A. J.; ZEEUW, C. de Textbook of wood technology. New York. Mc. Graw-hill. Compny, 1970. 105p.
RAMSAY, W.; BRIGGS, D. Juvenile wood: has it come of age?. In: A TECHNICAL WORKSHOP: JUVENILE WOOD-WHAT DOES IT MEAN TO FOREST MANAGEMENT AND FOREST PRODUCTS, 1985, Washington. Proceedings… Madison: Forest Products Research Society, 1986. p. 5-11.
ROOS, K. D.; SHOTTAFER, J. E.; SHEPARD, R. K., The relationship between selected mechanical properties and age in quaking aspen. Forest Products Journal, v. 40, n. 7/8, p. 54-56. 1990.
SHIOKURA, T.; Extent and differentiation of the juvenile wood zone in coniferous tree trunks. Wood Fiber Science, v. 28, n. 2, p. 85-90. 1982.
ZOBEL, B. J. The changing quality of the world wood supply. Wood Fiber Science, v. 18, p. 1-17. 1984.
