Evaluation of vessel features on physical and mechanical properties of wood of Common black poplar (Populus nigra L.) grown at different elevations in the region with a continental climate
This study essentially examined the effect of elevation on the anatomical structure, and the physical and mechanical properties of Common black poplar (Populus nigra L.) wood. The scope of the study was to observe the variability of vessel element features on physical and mechanical properties of Common black poplar (Populus nigra L.) in relation to habitat at different elevations. For this purpose, the twelve 12 year old trees Common black poplar were selected at three elevations (920, 950 and 980 m) within the distance of 1500 meters which was about four and half percent slope in the terrain from north to South directions. The comparative evaluation of the experimental observations was performed based on the differences between the tree harvesting direction and elevation on these properties of trial wood. The measured variables (height and breast diameter of the trial trees, amount of heratwood and sapwood zones on the transverse section of the disc samples), anatomical features based on the nature and the condition of vessels (vulnerability ratio, mesomorphy ratio), physical properties (wood density, volumetric shrinkage, fiber saturation point, and the maximum possible moisture content), and mecahnical properties based on the static bending (modulus of elasticity, modulus of rupture, compression strength, and tensile strength) were reported as to means of each elevation in the location where the trees grown indigenously. Accordingly all the considered parameters were compared based upon the overall means.
Keywords: common black poplar, Populus nigra L., elevation, wood properties