Diameter and volume structure of beech and fir stand in Zofik strictly protected nature reserve in Kozara National Park

Abstract

1 ha (100x100 m) permanent sample plot in Zofik Strictly Protected Nature Reserve, where all diameters were measured in 2020, has a diameter structure indicating its uneven-aged structure which deviates from a selection structure close to a normal state in beech and fir stands. Volume structure analysis shows the same result. If we take into account that the total wood volume is 632,69 m3/ ha and that participation of strong dimension trees (over 50 cm) is 69,31% we can conclude that this stand takes shape of a virgin forest which is an ultimate goal of designating this nature reserve. Diameter and volume structure as well as a total wood structure are partially expected taking into account a treatment of this stand in the last 50 years and its current status. Due to the possibility of large differences occurrence it is necessary to establish a network of permanent sample plots in the reserve, to permanently monitor and collect data on diameter at breast height and also on other inventory elements and analyse them for better understanding of beech and fir forests, their reforestation, growth and development.