tailieunhanh - Báo cáo lâm nghiệp: "Processes of loss, recruitment, and increment in stands of a primeval character in selected areas of the Pieniny National Park (southern Poland"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Processes of loss, recruitment, and increment in stands of a primeval character in selected areas of the Pieniny National Park (southern Poland). | JOURNAL OF FOREST SCIENCE 53 2007 6 278-289 Processes of loss recruitment and increment in stands of a primeval character in selected areas of the Pieniny National Park southern Poland A. Jaworski1 R. Podlaski2 -Department of Silviculture Faculty of Forestry Agricultural University of Cracow Poland Division of General Biology and Nature Protection Institute of Biology University of Kielce Poland ABSTRACT Studies were carried out during 1987-1997 in four stands situated in the lower mountain zone and representing the association Carici-Fagetum abietetosum sample plots Facimiech and Walusiówka and the community of a transitory character between Dentario glandulosae-Fagetum and Carici-Fagetum sample plots Gródek and Przeỉẹcz Sosnów . The greatest volume increment was found in a pure fir Abies alba stand of Facimiech m3 ha year . of actual stand volume determined in 1997 being in the optimum stage phase of aging and regeneration and the smallest one stand of Gródek m3 ha year . of actual stand volume being in the growing up stage phase of selection forest. The stand of Przeỉẹcz Sosnów was characterized by the greatest mortality of trees volume of loss . m3 ha year . In this stand of a transitory character between the growing up and optimum stages due to rapid mortality of fir the break up of the stand took place and in consequence the growing up stage phase of a little diversified stratified structure was developed. Volume of recruitment was the greatest in the stand of Facimiech . m3 ha year. In three fir Abies alba -beech Fagussylvatica stands the proportions of fir and beech in stand increment differed from their proportions in stand volume. The percentage of fir in volume increment was smaller and that of beech greater than their percentages in stand volume. Processes of increment and mortality of fir and beech pointed to a progressive process of changes taking place in stand species composition expressed by the increase of .