DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 1-2/2017 str. 55     <-- 55 -->        PDF

death and dying tree was seen in the area. No death tree or damage caused by I. sexdentatus in the previous years was found out and no outbreak population of the beetle at a level causing trees to death were created during the year. These low level invasions occurring in stands where young and healthy individuals are present have the possibility of causing only damage.
The results obtained in this study shows parallelism with the results of studies on the damage levels of low level invasions. Samman and Logan (2000) emphasizes that the invasion of bark beetle occurring endemic levels causing less than 2% death rates of trees will be beneficial in terms of removing weak and old individuals from stands. Therefore the removal of damaged trees in the area in terms of forest health should be evaluated within the plans.
Of the tree evaluated in the sample plots are, respectively, 36.68% for north, 43.01% for south, 9.39% for east and 10,92% for west in aspects. The percentages of trees damaged by I. sexdentatus in the study area according to aspects are 33.33%, 43.34%, 11.11% and 12.22%, respectively. Despite no significant difference was found between the trees damaged and undamaged by beetles according to aspects (p>0.05), (Table 6) it was determined that the trees damaged by beetle was found highest in the south aspects (43.34%).
Diameter of the trees in sample plots are; 33 of them (7.21%) at 8-12 cm, 130 of them (28.38) at 12-16 cm, 173 of them (37.77%) at 16-20 cm and 122 of them (26.64%) at 20-24 cm. There is a statistically significant difference between the diameters classes specified in terms of beetle damage (p<0.05) (Table 7) and it is seen that trees in diameter classes 20-24 cm are exposed to beetle damage more than others. 44.44% of the damaged trees are in this diameter classes (Figure 5).
Although the management strategies of bark beetles are not planned as to completely remove their populations due to