DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 1-2/1980 str. 17 <-- 17 --> PDF |
delt with. In both tandems one stand was healthy, and the other dying back. Both tandem stands have been of the same age, same site class and same other relevant conditions (manner of silvical management, stand elements etc.). Forest stands dealt with in this preliminary report are 67 and 68 years of age (the first tandem), 125 and 127 years of age (the second tandem) respectively. In the first tandem we have established the following: a) The average value of 1 m3 wood substance in the dying back stand is by 13,58% less than in the healthy one; b) The healthy stand has required 38,3 years to reach the increment of 10 latest cm (to the bark), whereas the dying back stand has required even 42,3 years, i. e. 4 years more; c) The healthy stand has grown 35,7 mm in the last 20 years, and the dying back stand only 30,8 mm, which means 13,73% less. On the other hand in the second tandem we have established the following: a) The average value of 1 m3 wood substance in the dying back stand is by 40,19% less than in the healthy one; b) The healthy stand has required 44,3 years to reach the increment of 10 latest cm (to the bark), whereas the dying back stand has required 57,0 years, i. e. 12,7 years more; c) The healthy stand has grown 45,8 mm in the last 20 years, and the dying back stand only 35,9 mm, i. e. 21,62% less. In our investigations we noticed certain regularities, that is the older the forest stands are, the more obvious are the differences. The consequences are enormous economic losses caused by dying back of the pedunculate oak. (m) |