DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/2020 str. 44     <-- 44 -->        PDF

diameter was 65 cm. The distribution of damaged trees per diameter sub-class is presented on graph 2.
The largest number of damaged trees is in the diameter sub-class of 12.5 cm and 7.5 cm. Smaller size damage is in larger diameter sub-classes.
Cause of damage – Uzrok oštećenja
Damage was classified in the following manner regarding the causes of said damage: damage which appeared during felling and processing, damage which appeared during winching and damage which appeared during skidding of wood. Distribution of damage per cause of damage is provided in graph 3.
Inthe presented graph, it is visible that damage that occur on trees are mostly caused during thewinching phase, which makes over 50% of all damage.
Size of wounds/damage – Veličina ozljeda/oštećenja
Damage per size wasdivided into four categories: 0-25 cm2, 25.1-100 cm2, 100.1-200 cm2and>200 cm2 according to the methodology used by Tavankar et al. (2017). The data on damaged trees per size of the wound in compartment 174/b is depicted in graph 4.
In the presented graph, it can be noticed, that most damage occured with wounds in size of 25.1 – 100 cm2, while the smallest amount of damage was the one with area of damage over 200 cm2.
The average size of the wound in total on all plots is 92.26 cm². On the surface, the largest wound occured during extraction and amounted to 350 cm², while the smallest wound occurred during felling and amounted to 5 cm².
Place of damage – Mjesto oštećenja
During research we determined the type of damage that appears on trees regarding the place. Under type of damage we understand the type of wound and in that case, we considered three types of damage. Those are wounds which appeared by contusion of bark (wood cambium not visible), wounds which appeared by removing of a dead part (visible wood cambium) and combined wounds.
The appearance of damage regarding the type (crushed bark, bark peel-off, combined) andplace of damage (stem, butt end, root collar or root) is depicted in the following images and values of gained data are provided in graph 5.
According to the data presented in graph 5., it is noticeable that the largest number of all forms of wounds/damage is located on butt end, while the smallest amount of damage can be seen on the root.
Management value of damaged trees – Gospodarska važnost oštećenih stabala
For each damaged tree we evaluated its management value (selected, useful and irrelevant) (graph 6.).
Out of 305 damaged trees, 112 trees (36.7%) belong to the category Selected tree, 115 trees (37.8%) belong to the category Useful tree and 78 trees (25.6%) belong to the category Irrelevant tree.
Status of damaged trees – Stanje oštećenih stabala
During the analysis of trees regarding the degree of damage, all trees were divided into three (3) categories: very severely damaged, severely damaged and insignificantly damaged (graph 7.).