Determining the most suitable intensities for precommercial thinning (PCT) in oriental beech ( Fagus orientalis ) stands, which cover substantial areas in Turkey and have a high economic and ecological value, is essential to provide higher economic return and obtain well-formed stems. The effects of various rates of PCT interventions on the growth characteristics of natural stands, located in the northern part of Turkey, were explored to determine appro-priate thinning rates; 24 experimental PCT plots (4 PCT rates × 3 replications × 2 sites) were established in young thicket-stage stands and four precommercial thinning rates such as light (1 – 1.5 m spacing), moderate (1.5-2.0 m spac-ing) and heavy (2.5–3.0 m spacing) thinning, including a control plot (i.e., untreated), were applied. At the end of the 2007 and 2010 growing seasons, the diameter and height of the trees were measured and growth analyzed based on the 3-year and 6-year incremental growth. PCT levels were found to have significant ( P < 0.05) effects on diameter, height, total basal area and total volume increment at the end of each period. The mean diameter and height incre-ment proportionally increased with increasing PCT intensity in the third and the sixth year. In both sites, the moderate PCT provided the greatest total basal area and total volume increment. The early results indicate that the moderate PCT (1.5–2 m spacing) boosted stand development over time.

Deniz Güney;Fahrettin Atar;?brahim Turna;Alkan Günlü

Department of Forest Engineering,Faculty of Forestry,Karadeniz Technical University,Trabzon 61080,Turkey;Department of Forest Engineering,Faculty of Forestry,?ank?r?Karatekin University,?ank?r?,Turkey

林业研究（英文版）

[1]Deniz Güney;Fahrettin Atar;?brahim Turna;Alkan Günlü-.Effects of precommercial thinning intensity on growth of Fagus orientalis Lipsky stands over 6 years)[J].林业研究（英文版）,2022(03):937-947

precommercial,Lipsky,thicket,spac

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