Zgradba in rast sestojev črnega bora na strmih, dolomitnih pobočjih v Zasavju

V nalogi se je proučilo zgradbo in rast sestojev črnega bora na strmih, prisojnih, dolomitnih pobočjih. Raziskava je bila izvedena v Zasavju. Zakoličilo se je osem ploskev, velikosti 30 x 30 m v debeljakih ter opravilo analizo zgradbe izbranih sestojev. Na vsaki ploskvi se je označilo devet najdebelejših dreves črnega bora. Na petih ploskvah se je ta drevesa posekalo in izvedlo debelno analizo, na preostalih treh ploskvah pa se je najdebelejšim borom izmerilo višino ter s pomočjo izvrtkov ugotovilo starost. a ploskvah se je ugotovilo lesne zaloge v razmaku od 146,6 m3/ha pa do 618,8m3/ha. Sortimentni sestav predvsem iglavcev, je za skrajnejša rastišča dobre kakovosti. Višinska rast se začne po 40-50 letih umirjati, debelinsko priraščanje pa s starostjo ne kaže upadanja. Ugotovljene vrednosti produkcijske sposobnosti rastišč se gibljejo v zelo širokem razponu od 2,7 do 11,6 m3ha-1leto-1. V primeru traktorskega spravila je vrednost lesa na panju večinoma pozitivna, v primeru spravila z žičnicami pa le v polovici primerov.In the presented work the structure and growth of European Black pine stands on steep, dolomited slopes exposed to the sun were analysed. The research was carried out in Zasavje. Eight research plots measuring 30 * 30 m were put down in the mature stands. On five plots nine of the thickest European Black pine trees were selected and cut for stem analysis, while on the other three plots nine of the thickiest pines were cored for age analysis and their height was measured. elatively high growing stock of analysed stands were established, reaching from 146,6m3/ha up to 618,8m3/ha. Assortment strucure is favourable considering the extremity of sites, as well. Height growth declines after the age of 40-50 years. On the other hand, the diameter growth persists high regardless of age. The range of established site productivities is wide, the values are between 2,7 and 11,6 m3ha-1year-1. When wood skidding is done by tractor the stumpage value is usually positive, while in the case of cable skidding only half of the stands show positive result