DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 3-4/1969 str. 9 <-- 9 --> PDF |
Third, I should point to the age of investigated stands. As we are dealing here with 80-year even-aged stands, it is clear that at this age the current increment gradually decreases with age. Accordingly, in this case the ageing of stands also is one of the causes of increment regression. Fourth, I shall mention the method of work, viz. the control method which in this case yielded somewhat lower values concerning the increment owing to the use of the same volume tariffs. Finally I should point also to the unknown causes which will still be investigated and likely to be establiched later on. Taken as a whole, for the time being the following may be said: Conclusion On the experimental plots of the Chair for the Forest Management of the Zagreb Faculty of Forestry, situated at Lipovljani, varied known and unknown factors have caused in the course of the last 6 years a sharp reduction of the Oak stand volume increment by about 50a/o if compared with the increment of 10 years ago. For the moment it is difficult to say what share has the individual factor in this increment reduction. This, among other things, will be the subject of investigations by the new Institute for Forest Research of the Zagreb Faculty of Forestry. |