tailieunhanh - Báo cáo lâm nghiệp: "Regeneration of forest stands on permanent research plots in the Krkonoše Mts"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Regeneration of forest stands on permanent research plots in the Krkonoše Mts. | JOURNAL OF FOREST SCIENCE 56 2010 11 541-554 Regeneration of forest stands on permanent research plots in the Krkonose Mts. S. Vacek1 I. Noskova1 L. Bílek1 Z. Vacek1 O. Schwarz2 faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic 2Krkonose National Park Administration Vrchlabí Czech Republic ABSTRACT The article describes natural combined and artificial regeneration on 38 permanent research plots in both Czech and Polish part of the Krkonose Mts. The attention is paid to species composition spatial horizontal and vertical and age structure of forest regeneration according to different stand and site conditions. Concerning the structure and dynamics of forest stands and their regeneration the potential and prospects of regeneration according to particular developmental stages and stand types beech stands mixed stands spruce-beech fir-beech spruce-firbeech spruce stands stands in the ecotone of the upper forest limit and relict pine woods were evaluated. In many aspects the plots show several similarities nevertheless the regeneration in different site and stand conditions show clear differences in dynamics of development. The main differences are result of different ecological conditions environmental limits and biological characteristics of dominant tree species. Keywords forest ecosystem forest regeneration natural combined artificial Krkonose Mts. site and stand conditions structure and development of forest stands Increasing the ratio of natural regeneration is in present days considered as one of the main challenges of the Czech forestry and nature protection. The use of natural regeneration is commonly accepted as essential part of close-to-nature forest management based on ecological principles. Beside lower establishment cost natural regeneration is important measure in conservation of forest genetic resources and establishment of forest stands with appropriate tree species composition and ecological .