| Popis: |
In this paper, biometric and chemical characteristics of Populus sp. wood and changes of them have been studied and analyzed with respect to the trees’ radial and longitudinal axes. In this research, three healthy trees of Populus sp. were selected and cut in Chalus. Three discs were chosen from every tree and they involve specific parts like breast, half of tree height and beneath canopy. Experimental samples have been prepared from heart to bark and duramentoalburain order to measure biometric characteristics (fibre length, cross-section dimensions) and data resulting from two desired axes have been statistically analyzed. Research findings indicate that the length of Populus sp. yarns increases from heart to bark within radial axis but there is an irregular increase in longitudinal one. Regarding changes of fibre cross-section dimensions (fibre diameter, fibre cavity diameter and fibre wall thickness) in radial axis, regular, regular and irregular increases are to be observed for them, respectively and in longitudinal one, there are irregular, regular and irregular increases. Also, with respect to biometric coefficients such as Rankle, flexibility and mix up in the radial axis, changes of decreasing and irregular increasing and irregular increasing trends have been seen while in longitudinal one, these changes have been decreasing, decreasing and increasing ones, respectively. Considering chemical changes of Populus sp. wood from bottom to top, irregular decreasing, irregular decreasing and regular increasing changes were reported for such extractives as lignin, cellulose and ash, respectively. |
