TAILIEUCHUNG - Effects of thinning intensity on the growth of narrow-leaved ash (Fraxinus angustifolia subsp. oxycarpa) plantations
Narrow-leaved ash (Fraxinus angustifolia) is one of the important broadleaved tree species, and it is becoming more important in European forestry because of its valuable wood and fast growing ability. Despite its wide natural range and high economic value, there is little or very limited information about the effects of thinning on the growth and development of ash stands, especially in plantations. | Turkish Journal of Agriculture and Forestry Research Article Turk J Agric For (2013) 37: 97-104 © TÜBİTAK doi: Effects of thinning intensity on the growth of narrow-leaved ash (Fraxinus angustifolia subsp. oxycarpa) plantations 1, 1 1 1 2 Emrah ÇİÇEK *, Faruk YILMAZ , Ali Kemal ÖZBAYRAM , Mehmet EFE , Murat YILMAZ , Ayhan USTA 1 Department of Forest Engineering, Faculty of Forestry, Düzce University, 81620 Düzce, Turkey 2 Department of Forest Engineering, Faculty of Forestry, Karadeniz Technical University, 61080 Trabzon, Turkey Received: Accepted: Published Online: 2 Printed: Abstract: Narrow-leaved ash (Fraxinus angustifolia) is one of the important broadleaved tree species, and it is becoming more important in European forestry because of its valuable wood and fast growing ability. Despite its wide natural range and high economic value, there is little or very limited information about the effects of thinning on the growth and development of ash stands, especially in plantations. In this study, 2 thinning experiments were carried out to determine the effects of thinning intensity on the growth of diameter, height, basal area, and volume in narrow-leaved ash plantations over a 6-year period in Adapazarı, Turkey. In the stands prior to thinning, mean diameter and stem number were about 31 cm and 416 trees ha–1 in the first experiment (at 36 years with 3 × 2 m initial spacing), respectively. The values were 24 cm and 544 trees ha–1 in the second experiment (at 22 years with × m initial spacing), respectively. Randomized block design with 3 replications was used in both experiments. The thinning treatments were as follows: removal of the basal area at 0% (control), 22% (moderate), and 39% (heavy) in the first experiment, and 0% (control), 19% (moderate), and 28% (heavy) in the second experiment. The 6-year results showed that thinning .
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