TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effects of selective thinning on growth and development of beech (Fagus sylvatica L.) forest stands in south-eastern Slovenia"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effects of selective thinning on growth and development of beech (Fagus sylvatica L.) forest stands in south-eastern Slovenia. | Ann. For. Sci. 64 2007 47-57 INRA EDP Sciences 2007 DOI forest 2006087 47 Original article Effects of selective thinning on growth and development of beech Fagus sylvatica L. forest stands in south-eastern Slovenia Andrej Boncina Ales Kadunc Dusan ROBIC University of Ljubljana Biotechnical Faculty Department of Forestry and Renewable Forest Resources Vecna pot 83 1000 Ljubljana Slovenia Received 25 May 2006 accepted 25 August 2006 Abstract - We studied the effects of two types of selective thinning on beech stands formed by a shelterwood cut in 1910 - with lower number of crop trees and higher thinning intensity T1 and higher number of crop trees with lower thinning intensity T2 . The stands were thinned in 1980 1991 and 2001. Despite a lower stand density after thinning the annual basal area increments of thinned stands in both thinning periods 1980-1991 and 1991-2002 were around 20 higher compared to those of the control unthinned stands. The mean annual basal area increment of dominant trees was 30-56 larger in the thinned plots compared to the control plots. Of 176 initial crop trees in the T1 72 were chosen again during the last thinning. In the T2 258 crop trees were chosen in the first thinning and only 62 of these trees were chosen again during the last thinning. Only crown suppression and diameter classes of crop trees significantly influenced their basal area increment when diameter classes crown size crown suppression and social status were tested. In the thinned stands the dominant trees are more uniformly distributed if compared to the dominant trees in the control plots. Finally the herbaceous cover and the species diversity were higher in the thinned plots. thinning Fagus sylvatica basal area increment crop tree stand structure distribution Résumé - Effets de l eclaircie selective sur la croissance et le développement des peuplements de hêtres dans le sud-est de la Slovénie. Nous avons effectue des recherches sur les effets de deux sortes d .

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