THE RATIO BETWEEN THE REAL AND THEORETICALLY NORMAL NUMBER OF TREES IN MIXED FIR, BEECH AND SPRUCE FORESTS IN THE NATIONAL PARK “BIOGRADSKA GORA”

In order to select the most favourable method of forest management, and to compile knowledge on the biological-ecological characteristics of tree species and their habitat requirements, good knowledge of the structural elements of stands is of essential importance. There is no doubt that the forest ecosystems of Biogradska Gora are significant forest objects, due to their exceptional diversity and high level of conservation. Due to the absence of human impact, these ecosystems are especially appreciated as professional and scientific research objects. In order to implement biodiversity management of a sufficiently high level within the forest ecosystems, it is necessary to become familiar with the development processes within the virgin forests. To identify the differences between the actual status of Biogradska Gora virgin forests and the functional optimal status under the given conditions, normal modes were prepared for mixed forests of spruce, fir and beech (Piceeto-Abieti-Fagetum). For the specific research stands in Biogradska Gora, graphic layouts of the ratios between the actual and theoretically normal number of trees, and a review of these ratios was performed.