TAILIEUCHUNG - Báo cáo lâm nghiệp: "Species composition in low mountain beech (Fagus sylvatica L.) stands in the Bieszczady National Park under the global warming"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Species composition in low mountain beech (Fagus sylvatica L.) stands in the Bieszczady National Park under the global warming. | JOURNAL OF FOREST SCIENCE 55 2009 5 244-250 SHORT COMMUNICATION Species composition in low mountain beech Fagus sylvatica L. stands in the Bieszczady National Park under the global warming D. Sugiero1 R. Jaszczak1 G. Rạczka1 P. Strzelinski1 a. Wẹgiel1 A. Wierzbicka2 -Department of Forest Management Poznan University of Life Sciences Poznan Poland Department of Game Management and Forest Protection Poznan University of Life Sciences Poznan Poland ABSTRACT The author analyzes the changes in the tree species composition of Dentarioglandulosae-Fagetum Klika 1927 em. Mat. 1964 in the mountain stands of Bieszczady National Park in 1993-2003. The analysis takes into account the changes over a ten-year period in the number and volume structure of each tree species in each stand layer young natural regeneration undergrowth and mature stand. Additionally after comparing the results with the natural Carpathian forests structure the adaptation level of the present tree species composition to the current climate and soil conditions as well as probable directions of future changes have been assessed. A ten-year period is too short to find significant changes in stand species structure but it is possible to see some trends beech share in stands is increasing and fir is decreasing. Keywords Bieszczady National Park beech stands species composition climate changes Recent researches in low mountain primeval forests in the Carpathians show that the tree species diversity has decreased as silver fir is being displaced by beech Fagus sylvatica L. Jaworski Karczmarski 1990 1991 Jaworski et al. 1994 Jaworski Skrzyszewski 1995 . Korpee 1989 observed the decrease in Douglas fir Pseudotsuga menziesii Franco share in stands where it used to occur naturally especially in the last 15-25 years. On the other hand however beech is going up in these stands a process presently typical throughout all the Carpathians. The cause might be traced back to the global warming resulting from the increase in

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