tailieunhanh - Báo cáo lâm nghiệp: "Natural regeneration of sessile oak under different light conditions"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Natural regeneration of sessile oak under different light conditions. | JOURNAL OF FOREST SCIENCE 57 2011 8 359-368 Natural regeneration of sessile oak under different light conditions I. Brezina1 L. Dobrovolný2 Training Forest Enterprise of Masaryk Forest in Krtiny special-purpose facility of Mendel University in Brno Brno Czech Republic Department of Silviculture Faculty of Forestry and Wood Technology Mendel University in Brno Brno Czech Republic Abstract Different variants of regeneration felling or different light conditions total site factor 15-95 and weed control were evaluated in relation to the 4-year development of individuals of regenerated sessile oak. The regeneration density is not dependent on light conditions. The highest mortality occurs on the open area of clear felling. For a certain time in youth it is possible to consider oak as a shade-tolerating species. With the increasing light intensity the diameter and height growth of oak seedlings increases proportionally being the highest at 100 light intensity. However to support at least medium-fast growth the species requires minimally 50 light intensity smaller closed clear-felled areas . On the other hand more extensive unprotected cleared areas appear to be quite unsuitable at the initial stages of regeneration. The positive effect of weed control on the success and growth of natural regeneration is questionable. We recommend developing the regenerated stand by means of a series of small-area about ha two-stage felling with a medium-long regeneration period 15-20 years . Keywords sessile oak natural regeneration light conditions close-to-nature forest management At lower locations of the Czech Republic oak is one of the most important commercial species. The natural proportion of oak within the CR is estimated to be about 19 the present proportion ranges about 7 . A long-term silvicultural target is to maintain this proportion or to increase it slightly. In the CR methods of artificial regeneration have been well managed from the aspect of both research and .