Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Structure and development of forest stands on permanent research plots in the Krkonoše Mts. | JOURNAL OF FOREST SCIENCE 56 2010 11 518-530 Structure and development of forest stands on permanent research plots in the Krkonose Mts. S. Vacek1 Z. Vacek1 L. Bílek1 I. Noskova1 O. Schwarz2 1Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic Krkonose National Park Administration Vrchlabí Czech Republic ABSTRACT The research is focused on structure and development of forest stands from 5th to 8th forest vegetation zone in the Krkonose Mts. The forest stand diversity according to tree species composition and representation horizontal and vertical structure was evaluated by using following indices Clark-Evans aggregation index Clark Evans 1954 standardised Arten-profil index Pretsch 2005 and index of complex diversity after Jaehne Dohrenbusch 1997 . Growth model SIBYLA Fabrika Durský 2005 was used for visualizations and growth predictions of forest stands on particular plots. Based on research results management recommendations were evaluated. Keywords forest development mountain forest structural diversity Foresters and naturalists often relate the forest to the idea of steadiness homeostasis and ecological production and environmental continuity with respect to particular forest developmental phase. This functional continuity can be negatively influenced by several disruptive factors. For some part of conservationists the natural development of forests and forest stands without any human intervention is the highest priority nevertheless in the conditions of Central Europe this requirement is often only illusory. In changed ecosystems is than their disturbance considered as part of natural development with no respect to their ecological stability or the level of autoregulation processes. For the reason of rational and permanent forest use near to nature management demands a vast knowledge of the forest ecosystem and the control of natural processes in the forest Boncina 2000 Sagheb-Talebi Schutz 2002 . The protection
