tailieunhanh - Báo cáo lâm nghiệp: "Effect of stand segmentation on growth and development of Norway spruce stands"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Effect of stand segmentation on growth and development of Norway spruce stands. | JOURNAL OF FOREST SCIENCE 55 2009 7 323-329 Effect of stand segmentation on growth and development of Norway spruce stands J. Horák1 J. Novák2 1Faculty of Forestry and Wood Sciences Czech University of Life Sciences in Prague Prague Czech Republic Forestry and Game Management Research Institute Strnady Opocno Research Station Opocno Czech Republic ABSTRACT Segmentation of stands by tracks is often the first phase of forest tending. However a suitable track width is still discussed in forest practice in the Czech Republic. This article deals with the effect of track width on the growth characteristics of young spruce stands. Research involves several variants of European thinning experiment IUFRO CZ 14 Machov situated in Eastern Bohemia. Totally 3 variants were analyzed 1 - non-segmented control plot without thinning and plots with forest tending at top height 10 and 20 m and with different present width of tracks plot 3 - originally m plot 4 - originally m . The significantly positive effect of stand segmentation and tracks on dbh and crown length was found only for individuals growing in the first row next to a track. As regards the stand volume and volume of mean stem differences between variants with skidding track 3 and 4 were found minimal and insignificant. Therefore the observation did not reveal any evident losses of production caused by different widths of skidding tracks. Keywords Norway spruce forest tending skidding track growth production static stability Tending of forest stands is an important silvicultural measure directed at development of forest stands in terms of their production and non-production functions. Segmentation of stands by tracks is often the first phase of forest tending. As various logging techniques can be used skidding tracks must be adapted to the particular technical parameters above all to the wheel gauge of machinery. Segmentation of tended stands by skidding tracks or slope roads enables also their accessibility makes