Abstract
In this study, we examined oriental spruce (Picea orientalis L.) radial growth variation in the even-aged pure and mixed forest stands for last ten years. We looked at only the closed canopy stands. The results showed that radial growth in the pure oriental spruce forest stands has a decreasing logarithmic curve (from 15.35 mm DBH for the 40 years old trees to 8.38 mm DBH for the 140-year and older trees). On the hand, the mixed forest stands has a radial growth of 7.50 mm DBH for the 40-year old trees and 12.13 mm for the stands that are older than 140 years. Overall average values of the radial growth in pure and mixed oriental spruce stands were very close to each other (pure 10.27 mm DBH; mixed 10.55 mm DBH).
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