Effects of precommercial thinning intensity on growth of Fagus orientalis Lipsky stands over 6 years  

作　　者：Deniz Güney Fahrettin Atar İbrahim Turna Alkan Günlü 

机构地区：[1]Department of Forest Engineering,Faculty of Forestry,Karadeniz Technical University,Trabzon,61080,Turkey [2]Department of Forest Engineering,Faculty of Forestry,ÇankırıKaratekin University,Çankırı,Turkey

出　　处：《Journal of Forestry Research》2022年第3期937-947,共11页林业研究（英文版）

摘　　要：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 appropriate 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 spacing) 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 increment 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.

关 键 词：Tending operation Stand development Precommercial thinning Thicket stage 

分 类 号：S792.11[农业科学—林木遗传育种]