The Within-tree Variation in Wood Density and Mechanical Properties and Their Relationship in Juniperus polycarpos

Abstract The variations of wood density and mechanical properties of Juniperus polycarpos trees were studied in a natural forest in Iran. Sample disks were taken from each tree to examine wood density and mechanical properties (MOE and MOR) from pith to bark at breast height, 50%, and 75% of total tree height. The analysis of variance (ANOVA) indicated that radial position and height significantly affected all wood properties. The wood density, MOE and MOR were decreased along horizontal position from the pith to the bark and vertical direction from base upwards. Regression analysis showed that modulus of elasticity (MOE) and modulus of rupture (MOR) had a positive correlation with wood density.Key Words: Juniperus polycarpos, density, modulus of elasticity, modulus of rupture Received: July 15, 2015. Revised: August 9, 2015. Accepted: August 24, 2015.Corresponding author: Majid KiaeiDepartment of Wood and Paper Science and Technology, Chaloos Branch, Islamic Azad University, Chaloos 46615/397, IranTel: 981152226601, Fax: 981152226603, E-mail: mjd_kia59@yahoo.com