The Effect of Altitude on Juvenile Wood Formation and Fiber Length, a Case Study in Iranian Beech wood ( Fagus orientalis L

Abstract

J. Agric. Sci. Technol. (2006) Vol. 8: 221-231 221 The Effect of Altitude on Juvenile Wood Formation and Fiber Length, a Case Study in Iranian Beech wood ( Fagus orientalis L.) S. Z. Hosseini 1 ABSTRACT The mean fiber length of three beech trees ( Fagus orientalis L.) at the lower and higher points (1% and 75% tree height) of the stem at an intermediate altitude (500-1000m) in the Caspian forests in Sari region were 1.36 and 1.22mm respectively, close to the values in three trees at high altitude (1000-1500m), that were found to be 1.39 and 1.36 mm. The mean fiber lengths of the whole stem, using stem formula, were considered as 1.31 and 1.38mm at intermediate and high altitudes and so were very close each other. Juvenile wood portions in the stem comprised 17 annual rings, which took up 7.3% of the stem by volume at intermediate altitude. At high alti tude, these values were obtained as 18 annual growth rings, and 8.75% juvenile wood in the stem. The reason for greater juvenile wood at high altitude was somehow a wider ring wi dth at higher elevation. The mean ring width of lower and upper points of the stem at intermediate altitude were found to be 1.82 and 2.95mm respectively; meanwhile, at high alti tude, the findings were 2.97, 3.37mm. Despite the data obtained, t- test comparison was conducted between mean fiber lengths of the two heights of the stems at tw o altitudes, and no significan t differences were found at the 1% level. The exploitation age was strongly dependent on how much juvenile wood there was in the stems, that at high altitude was gr eater than at intermediate. However, statisti- cal comparison showed no significant differences between that and the 1% level. There- fore, altitude in the range of about 500m sh owed no important im pact on beech fiber length, exploitation age or juven ile wood border in Caspian forests