تعيين مناسب ترين سن بهره برداري درختان صنوبر دلتوئيدس كلن 51/77 بر اساس خواص بنيادي چوب آن (مطالعه موردي در استان گلستان)

Determination of the best cutting age of Populus deltoids clone 77/51 trees based on fundamental properties of wood (case study in Golestan province)

This study was performed on determination of the best cutting age of Populus deltoids trees (clone 77/51) based on wood fundamental properties. Three normal trees were randomly cut down in different cutting ages with 4, 8, 12, 16 and 20 12-years age from Shastkolateh Experimental Forest located in Gorgan. Anatomical, Physical and Chemical properties of each tree was recorded. The results indicated that, the effects of different cutting ages of Populus deltoids trees on wood fiber dimensions (fiber length, fiber diameter and cell wall thickness), wood physical properties (dry density, critical density and volumetric shrinkage) and wood chemical components (cellulose, lignin, extractives soluble in klchoal-aceton,hot water soluble extractives, sodium hydroxide soluble extractives and ash) were significantly different in 95% confident levels. Also, the results releved that, there are no significant differences in anatomical characteristics, physical properties and chemical components of Populus deltoids trees at 12-years age. Since wood juvenile of the species Populus deltoids trees have finished, therefore, based on fundamental properties of wood, the best cutting age of populus deltoids spp trees(clone 77/51) from Shastkolateh zone in Golestan Provience is 12 years-old.