DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 11-12/1979 str. 90 <-- 90 --> PDF |
year, respectively 94,2% of annual increment is cut. On the basic of typological investigations approximately 10"´" of annual cut is exploited by using the group selection method. The size of circles was from 0,2 to 0,4 ha and if there were not enough young plants (fir, spruce, beech), seedlings of spruce were used. That method had been favourably estimated to both the regeneration and the increased increment (which on similar areas made 1,8—2,53"´«, whereas the average of the entire enterprise made 1,9%). The current volume increment on site quality 1. amounted to 16,0 m3 per ha in 1978. Eng. G. Petrovi ć presented the application of group selection method in the area of Novi Vinodolski Forest Office. He established that the method was cheaper for the exploitation, i. e. felling of the old stand. The final balance, however, was not positive, because of the expenses incured by spruce planting on insufficiently regenerated cutting areas. In one such case the spruce had to be planted on 20 ha of the 32 ha in total, which made about 601/» of the cutting area. Dr. V. Hre n spoke about regeneration of all-aged forests from the standpoint of typological investigations, emphasizing the significance of the light for regeneration. Discussing the potential possibilities of forests of Forest Enterprise Ogulin Dr. D. Cesta r stated that the amount of the present production was only 53% of the normal, and that only 50% of the site potential had been used. Eng. D. Böh m discussed the selection forest management from the standpoint of the nature protection service and shared the opinion of wider profes* siona! circles that group selection method with a clear cut of 0,2—3,0 and more ha should not be applied in the forests of the region. However, to reach the final decision further investigations on the consequences of such management are needed, keeping particularly in mind that only spruce had been used to fill up bare spots so far. Although this species is indigenous in that area, it is not dominant and therefore would influence the landscape and change ecological relations as well. |