DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/2020 str. 42     <-- 42 -->        PDF

skidders (figure 3). The applied work method was assortment work method.
Prior to the initiation of all operations in M.U. ”Hrbinje-Kujača”, we set-up plots in compartment 174/b. 12 plots were set. Dimensions of the plots were30x30 meters.
The plots were set using compasses, by determining the azimuth from the skidder trail and then measuring using measuring tape 30 meters into the length of the plot. Borders of the plots were marked with spray by marking border trees. Trees were marked with two red lines and a point between them. In such a manner,the number of the plot and the mark of the zone were written.
In defining the plot site, we used the program Google Earth Pro (figure 4). Microsoft Excel was used for data processing. Also, other tools were used such asa compass, measuring tape, calliper, ruler and GPS.
In determining the damage per damage location, we applied the classification determined by Meng (1978), which separates four categories of damage: damage to the root, damage to root collar, damage to butt end and damage to stem.
Also, damage that had appeared in the past work periodswas recorded, which was then characterised as “old damage”. We analysed exclusively trees above the taxation threshold (above 5 cm of breast height diameter). Besides recording data on the location of damage, the following data were gathered: amount of damage, size of damage, place of damage and cause of damage. With that we had to determine the tree type, breast height diameter and its economic value. Damage per type of damage was classified as crushed bark or bark peel-off. Crushed bark is damage where the wood cambium zone is not visible and the surface layer of the bark has been removed. Bark peel-off represents damage where the wood cambium zone is visible.
Recordings were done in June 2018. During this research, damage was analysed after the work phases had been completed.
During data processing, the degree of tree damageand the forecast of its health status was to be determined. That is why it was necessary, even after the recording of damage, to determine its economic value. Trees were classified in three groups:
1. Selected (tree that by its characteristics should be selected and which has large value considering the possibility to use the wood mass)
2. Useful (tree that does not have large economic value considering the possibility to use the wood mass but it is useful because it helps other growing trees)