THE GROWTH RESPONSE AND THE DAMAGE OF NORWAY SPRUCE (PICEA ABIES (L.) KARST) TREES AFTER THINNING VIA FOREST HARVESTER TECHNOLOGY

This article discusses about the influence of the logging lines width on diameter increment of Norway spruce (Picea abies L.). The aim of this research is to verify the optimum width logging lines. For this purpose is the stand divided by the logging lines of different widths. The main entering factors of evaluation, are the damage of trees in stand after improvement felling with CLT technology and height of brushwood on logging lines and a distance of evaluated trees from the tracks of these machines. Silvicultural measures were carried out by a three different methods on selected areas in 2014. The damage the trees decreased with increasing width of the line. The increment of the trees on the edge of lines 4 and 5.5 m was smaller than in the line of 3 m. The differences between the increment on the edge of stand and inside of stand were surprisingly very variable. Therefore the dynamic growth response of trees will be monitor in long-term.