DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 5-6/2015 str. 42     <-- 42 -->        PDF

which wound areas were calculated and expressed in cm2. Wounds measured on every tree were used to calculate both the average area of wounds incurred during tree felling and the average area of injuries occurring during the transport of wood assortments.
RESULTS
REZULTATI
The number of analyzed trees, the average number of produced assortments and the average length of assortments are shown in Table 2.
Felled trees were processed by bucking into logs of optimal length for extraction and in order to reach the maximum financial effect from the aspect of the national quality standards for roundwood.
The first phase of transport in SP1 was carried out in November at an average morning temperature of 1.5 °C measured at 07:00 h and a daily temperature of 6.1 °C measured at 13:00 h in SP2. The timber extraction was carried out in December at an average morning temperature of 4.3 °C and a daily temperature of 8.8 °C. Skidding was performed downhill by 3 m-wide skid trails.
During the felling of trees and transport of wood assortments, the total number of injuries in the mixed stands (SP1) amounted to 610 in a total of 226 inspected trees, i.e. an average of 2.69 wounds per inspected tree (1.41 wounds to standing trees and 1.28 wounds to the regeneration). In the pure stand (SP2) a total of 101 trees were felled, which caused 229 injuries, i.e. 2.27 wounds per inspected tree (1.84 wounds to standing trees and 0.43 wounds to the regeneration). Out of the total number of inspected trees in the mixed stand, 138 trees were the cause of damage i.e. 61 % of them, while in the pure stands the number of damage causing trees amounted to 60, i.e. 59 % of the total number of trees.
Damage incurred in the felling phase – Oštećenja nastala tijekom sječe
Considering the number of injuries to residual trees in the stand, damage to the crowns of neighbouring trees was observed as the most common type of damage in both sample plots (Figure 2). A total of 169 wounds (0.75 per tree) were recorded in the mixed stand and in the pure stand that number was 77 (0.77 per tree).
In both sample plots, damage to the stem was the second most significant type of damage as regards the frequency of occurrence. Damage to the stem occurred in 98 trees (0.43 wounds per tree) in the mixed stand and in 50 trees in the pure stand (0.50 wounds per tree).
Next in importance regarding the frequency of occurrence is damage to the butt end. In the mixed stand, this type of damage was found in 50 trees (0.22 wounds per tree), and in the pure stand in 45 trees (0.45 wounds per tree).
During felling the lowest number of wounds observed was to the root collar of trees. In SP1 this type of damage was observed in only three trees (0.01 wounds per tree), and in SP2 in 12 trees (0.12 wounds per tree).