Genç Odun ve Özellikleri

Ahşap malzemenin (özellikle yapı sektöründe) olabildiğince homojen olması istenmektedir. Ağaçların büyüme

Anahtar Kelimeler:

Genç odun, Olgun odun, Anatomik özellikler, Mekanik özellikler

Juvenile Wood and Its Properties

Wood based products (especially building sector) are desired homogeneous as much as possible. Juvenile woodwhich occurs at first years of trees growth (approximately 5-20 years) may impair this homogeneous. Becausejuvenile wood show too different in mature wood, which comprise of after juvenile wood (more than 20 years)and have higher strength properties. It’s significant to determine juvenile wood tissue of trees which used forestproduct industrial in Turkey like pines, elm, alder, and beech owing to the poorer mechanical properties thanmature wood. Therefore, unexpected result may appear on wood materials that manufactured in natural juvenileforest or plantation. In this paper is interpreted by study to studies compared physical, chemical, mechanicalproperties of juvenile and mature wood. Thus it is indicated that technologic properties of wood based materialsare affected by tree age as scientific.

Keywords:

Juvenile wood, Mature wood, Anatomic properties, Mechanical properties,

PDF

___

o Alteyrac, J., Cloutier, A., Zhang, S.Y. 2006. Characterization of juvenile wood to mature wood transition age in black spruce (Picea mariana (Mill.) B.S.P.) at different stand densities and sampling heights, Germany. Wood Science Technology 40: 124–138.
o Bao, F. C., Jiang, Z. H., Jiang, X. M., Lu, X. X., Luo, X. Q., Zhang, S. Y. 2001. Different in wood properties between juvenile wood and mature wood in 10 species grown in China, Germany. Wood Science and Technology, 35:363-375.
o Bhat, K.M., Priya, P.B., Rugmini, P. 2001. Characterisation of juvenile wood in teak, Germany. Wood Science and Technology 34:517–532.
o Deresse, T., Shepard, R.K., Shaler, S.M. 2003. Microfibril angle variation in red pine (Pines resinosa Ait.) and its relation to the strength and stiffness of early juvenile wood, USA. Forest Products Journal 53: 34-40.
o Guler C., Copur Y., Akgul M., Buyuksari U. 2007. Some Chemical, Physical and Mechanical Properties of Juvenile Wood from Black Pine (Pinus Nigra Arnold) Plantations Journal of Applied Science, 7 (5): 755-758.
o Gilani M.S., Sunderland H., Navi, P. 2005. Microfibril angle non-uniformities within normal and compression wood tracheids, Germany. Wood Science and Technology 39: 419-430.
o Krahmer R.L. 1986. Fundamental anatomy of juvenile and mature wood, in: Proc. Technical Workshop: Juvenile wood - What does it means to forest management and forest products. For. Prod. Res. Soc. Madison.
o Kretschmann D. E. 1998. Properties of juvenile wood. Techline: Properties and Use of Wood, Germany. Composites, and Fiber Products, Forest Service, Issued 9.
o Larson, P.R., Kretschmann, D.E., Clark, A III, Isebrands, J.G. 2001. Formation and properties of juvenile wood in southern pines: a synopsis. Gen. Tech. Rep. FPL-GTR-129. Department of Agriculture, Forest Service, Forest Products Laboratory, Madison, USA.
o Oluwafemi, O. A. 2007. Wood properties and selection for rotation length in caribbean pine (Pinus caribaea Morelet) grown in Afaka, Nigeria. Am-Eurasian J. Agric. & Environ. Sci. 2(4): 359-363.
o Peszlen, I. 1995. Juvenile wood characteristics of plantation wood species. Abstract XX, IUFRO, World Congress, Finland. IAWA Journal 16:14.
o Passialis, C., Kiriazakos, A. 2004. Juvenile and mature wood of naturally-grown fir trees, Germany. Holz Roh Werkst 62: 476-478.
o Pikk, J., Kask, R. 2006. Mechanical properties of juvenile wood of Scots pine (Pinus sylvestris L.) on Myrtillus forest site type. Baltic Forestry, Lithuanian Forest Research Institute, Estonia.
o Reiterer, A., Lichtenegger H, Tschegg S, Fratzl P. 1999. Experimental Evidence for a Mechanical Function of the Cellulose Microfibril Angle in Wood Cell Walls. Philosophical Magazine A, 79–9, 2173–2184.
o Rowell, R. M., 2005. Handbook of Wood Chemistry and Wood Composite. CRC Press, 1st Edition, 135-140 pages.
o Smith, W.R., Briggs, D.G. 1986. Juvenile Wood: Has It Come of Age?, in: Proc. Technical Workshop: Juvenile wood - What does it mean to forest management and forest products? For. Prod. Res. Soc. Madison.
o Williams, R.S., Feist, W.C. 1999. Selection and application of exterior stains for wood. Gen. Tech. Rep. FPL–GTR–106. Department of Agriculture, Forest Service, Forest Products Laboratory, Madison.
o Yang, C.K. 2002. Impact of spacing on juvenile wood and mature wood properties of white spruce (Picea glauca). Taiwan J. of For Sci 17: 13-29.
o Yeh, T.-F., Braun, J.L., Goldfarb, B., Chang, H.-M. and Kadla, J.F. 2006. Morphological and chemical variations between juvenile wood, mature wood, and compression wood of loblolly pine (Pinus taeda L.), Germany. Holzforschung 60:1-8.