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ŠUMARSKI LIST 5-6/2019 str. 44     <-- 44 -->        PDF

In this study, according to thinnings in the Maçka-Yeºiltepe experiment, the highest annual height increments occurred in strong thinning. However, the highest annual height increments in Vakfıkebir plantation were found in light thinning. Furthermore, the annual height increments in Maçka-Yeºiltepe plantation were found to be higher compared to the older Vakfıkebir plantation. This is thought to be related to the high growth potential of young stands as well as the aspects of plantations. Maçka-Yeºiltepe plantation is located in the eastern aspect while Vakfıkebir plantation is located in the south-western aspect. Mayer et al. (2002) reported that radiation interception at the canopy layer is higher on the SW facing slope, causing higher temperatures, higher evapotranspiration and, therefore, lower water availability.
In this study, Oriental beech plantation areas gave an early response to thinning, and the highest diameter increments occurred in strong thinning in both plantation areas. However, the diameter increments in Maçka-Yeºiltepe plantation were found higher. Significant differences were determined between basal area and stem volume increments and thinnings in each plantation. Relative basal area and volume increments were found higher in Yeºiltepe experiment compared to Vakfıkebir experiment. The highest increments were found in strong thinning in both plantations. Our results support the known information about the effects of thinning on stand production.
Thinning during the young stage enables trees to grow faster and resist damaging agents. Thus, thinning practices should focus on young Oriental beech stands when the current annual increment is at its highest levels. Accordingly, future trees should be selected when the first thinnings are applied, and then attention should be concentrated on the crown development of future trees in order to maintain a desirable diameter increment and obtain enough stem diameter at the end of the rotation period.
We would like to thank the General Directorate of Forestry and the Ministry of Forestry and Water Affairs, which supported this study (03.1208/2009-2015). This study was conducted with the cooperation and efforts of many people. We would like to extend our appreciation and thanks to Assoc. Prof. Dr. İlker Ercanlı, and the assistance of Tuğba Bozlar, Ali Sevim, İrfan Öztürk, Salih Malkoçoğlu, Ergün Kahveci, Mustafa Aybar and Sıtkı Bayram.
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