Abstract
Three trees were randomly selected from each age, The trees were felled and one disc 5cm. in thickness were taken from DBH in each selected tree to study the anatomical properties namely; fiber length، fiber diameter, fiber wall thickness, the ratio of double fiber wall thickness to lumen diameter (Runkel ratio) and the ratio of fiber length to its diameter. From each disc a sector was taken from the pith to the bark and divided into three equal parts to study the variation in anatomical properties across the stem.Average fiber length of the young trees (1.03mm), while (1.00mm) for the mature trees.Analysis of variance showed no significant difference between the trees for all the anatomical properties in this study for both ages. Analysis of t test showed that there was no significant difference between the average of fiber length to its diameter، While there is significant difference between fiber wall thickness, fiber lumen diameter and the Runkel ratio.The results did not shows any regular concerning the variation of fiber dimension in the radial direction .It was shown that there is a significant increase in the fiber length for each ages and in the fiber wall thickness and the Runkel rtio for the mature trees. There were an increase from the pith to the middle then not significant increase for the fiber diameter and the Runkel ratio for the young trees but it is significant for the ratio of fiber length to its diameter in the mature trees. There was no significant increase in the fiber diameter and fiber lumen diameter from the pith to the middle then there is a significant increase till the bark and there was a decrease from the pith to the middle then there is no significant increase to the bark of the young trees. We can conclude that the fiber length of the tow ages lies within the fiber lengths ranges used in pulp and paper manufacturing. The average of Runkel ratio of the mature trees also lies within the values required for pulp and paper manufacturing so it maybe more suitable than the young trees. Crystals in chambered fibers، libriform fibers and fibers with dentate end were observed.
