Variations In Volume And Dimensions Of Rays And Their Effect On Wood Properties Of Teak

Authors

  • Md. Mustafizur Rahman
  • Shinji Fujiwara
  • Yasushi Kanagawa

Keywords:

Tectona grandis L, ray volume, ray dimensions, compression strength, Bangladesh

Abstract

Six teak (Tectona grandis L.) trees were sampled from two districts in Bangladesh. Ray proportion and dimensions of rays (ray area, ray height, and ray width) on tangential sections were measured, and the influence of ray volume on longitudinal and radial compression strength was investigated. Ray proportion remained more or less constant from pith to bark. Number of rays/mm2 and dimensions of rays became constant at about ring 10 from the pith. Ray proportion and dimensions showed characteristic values from tree to tree and were not affected by growth rate. The trees that had the highest ray volume showed higher specific gravity and higher radial compression strength. It can be considered as the influence of the rays. Hence it may be advisable to breed teak with a high ray proportion.

References

Beery, W. H, G. Ifju, And T. E. McLain. 1983. Quantitative wood anatomy-relating anatomy to transverse tensile strength. Wood Fiber Sci. 15(4):395-407.nBhat, K. M., P. B. Priya, And P. Rugmini. 2001. Characteristics of juvenile wood in teak. Wood Sci. Technol. 34(6): 517-532.nBodig, J. 1965. The effect of anatomy on the initial stressstrain relationship in transverse compression. Forest. Prod. J. 15(5):197-202.nBoyce, S. G., M. Kaeiser, And C. F. Bey. 1970. Variation of some wood features in five walnut trees. For. Sci. 16(1): 95-100.nBurgert, I., And D. Eckstein. 2001. The tensile strength of isolated wood rays of beech (Fagus sylvatica L.) and its significance for the biomechanics of living trees. Trees 15:168-170.nGartner, B. L., H. Lei, And M. R Milota. 1997. Variation in the anatomy and specific gravity of wood within and between trees of red alder (Alnus rubra Bong.). Wood Fiber Sci. 29(1):10-20.nHaygreen J. G., And J. L. Bowyer. 1982. Hardwood structure. Pages 37,77-83 in Forest Product and Wood Science: An Introduction. The Iowa State University Press, Ames, IA.nKawamura, Y. 1979. Studies on the properties of rays (I): Influence of rays on anisotrophic shrinkage of wood. Mokuzai Gakkaishi 25(7):455-460.nKawamura, Y. 1984. Studies on the properties of rays III: Influence of rays on anisotrophic shrinkage of wood (2). Mokuzai Gakkaishi 30(10):785-790.nKennedy, R. W. 1968. Wood in transverse compression: Influence of some anatomical variables and density on behaviour. Forest. Prod. J. 18(3):36-40.nMattheck. C., And H. Kubler. 1997. Wood - the internal optimization of trees. Springer-Verlag, Berlin, Germany. Pp. 90-108.nOhbayashi, H., And T. Shiokura, 1990. Wood anatomical characteristics and specific gravity of fast-growing tropical tree species in relation to growth rates. Mokuzai Gakkaishi 36(10):889-893.nRahman, M. M., S. Fujiwara, Y. Hirakawa And Y. Kanagawa. 2004. Wood density in relation to growth rate and tissue proportions of teak grown in Bangladesh, J. Forest Planning 10(2):53-57.nSchniewind, A. P. 1959. Transverse anisotrophy of wood: A function of gross anatomical structure. Forest Prod. J. 9(10):350-359.nTaylor, F. W. 1969a. Variation of wood properties in sycamore. Forest Products Utilization Laboratory Research Report. 7:1-18. Mississippi State University, Mississippi State, MS.nTaylor, F. W. 1969b. The effect of ray tissue on the specific gravity of wood. Wood Fiber. 1(2):142-145.nTaylor, F. W. 1971. Variation of wood properties in sugarberry. Forest Products Utilization Laboratory Research Report 11:1-17. Mississippi State University, Mississippi State, MS.nWhite, D. J. B., And A. W. Robards. 1966. Some effects of radial growth rate upon the rates of certain ring-porous hardwoods. J. Inst. Wood Sci. 17(1):45-52.n

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Published

2007-06-05

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Research Contributions