Investigation of Effect of Growth Site on Fiber Biometry and Physical Properties of Populus NigraWood

In this study, the effect of site index on biometrical and physical properties of populus wood. For this reason, three regions of Malayer, Shazand and Borujerd in Markazi provience were selected ,and the characteristics of each region such as soil type, geographical direction and climate coditions were determined. In each region, 5 normal populus nigra species were selected and from each stand on specimen ( totally 5 samples) in breast hieght prepared and transferred to the laboratory. Then, biometrical characteristics: Fiber length, fiber diameter, cell wall thickness and physical properties in cluding: Dry-density, critical-density and volumetric shrinkage were measured. The results showed that, site index has significantly effect on all biometrical and physical properties of populus wood in 95% confident levels. Also Borujerd site as mentioned to biometrical and physical properties has highest value compared with Malayer and Shazand sites.