The article deals with the relations between mass of root system, branches, and stem and the above-ground size of silver fir (Abies alba Mill.) on Omphalodo-Fagetum sites (Tregubov, 1957) Marinček & al., 1993 in GGE Snežnik. Fifteen silver fir trees with diameter at breast height (DBH) from 21 to 85 cmwere analyzed. Sectional measurement of the stem was performed, branches and root system mass was measured and samples of branch, stem, and root system wood for wood density determination were taken. Average density of branch woodis 595 kg/m3, of commercial stem wood 394 kg/m3, and of root system wood 365 kg/m3. The logarithm of the root system dry mass most closely correlates with the logarithm of a tree's commercial stem wood (r = 0.981; p = 0.000); weexplain 96 % of root system wood dry mass variability with the volume of a tree's commercial stem wood. The logarithm of the branch wood dry mass most closely correlates with the commercial stem wood logarithm (r = 0.883; p = 0.000); based on data about the volume of a treeʼs commercial stem wood we explain 76 % of a tree's branch wood dry mass variability. As related to the total dry mass (branch wood, commercial stem wood, root system wood), the share of the root system wood amounts from 16 % do 24 %, branch wood from 3 % to 14 %, and the commercial stem wood from 65 to 79 % of the total dry mass. Due to various basic wood densities of branch wood, root system wood, and commercial stem wood, the root system wood share as related to the total volume is averagely larger than root system wood share as related to the total mass. The total dry mass of commercial stem wood, branch wood, and root system wood together amounts to 261.6 t/ha (130.8 t C/ha) in the analyzed stand with the growing stock of 475.4 m3/ha. The commercial stem wood thus forms the largest share as related to mass and volume.
COBISS.SI-ID: 3382182
With development of biomass market the interest for green wood chips has arisen. With cutting to length system, selective cutting and predominant harvesting technologies the concentration of forest residues is rather small and the detailed economics of these operations has not been analysed in detail yet- The main aim was to study in detail different aspects of forest residue extraction on selected test plots.
COBISS.SI-ID: 3512998