Some Major Structural Characteristics of a Silver Fir-Dominated Stand in the Lignum Forests (Bacău County, East of Romania)
Öz
The paper presents the results of a project dealing with the structural characteristics of a silver fir (Abies alba Mill.)-dominated stand (including Norway spruce, European larch, European beech, hornbeam, etc. as secondary tree species), 25 years old and naturally regenerated by uniform shelterwood cuttings. In spring 2012, three research & demonstration plots (RDP1, 2, and 3) of 450 sq.m, 400 sq.m and 300 sq.m were established. In RDP 1 and RDP 2 cleaning-respacing interventions with different silvicultural objectives and intensities were carried out while RDP3 was kept as control. In all plots, potential final crop trees (between 400 and 489 trees/ha), mostly of silver fir, were selected based on the vigour-qualityspacing criteria. The main results of the field measurements and office analyses are as follows: - owing to the exceptional regeneration potential of silver fir, as well as its high shade-tolerance, the initial stocking of living trees was over 10,000 stems in all plots. After intervention the stocking varies between 1,350 trees/ha in RDP 2 and 10,032 trees/ha in control plot; - following intervention stand basal area was reduced to 10.87 sq.m/ha (RDP2) and 20,25 sq.m/ha (RDP1); basal area shows the maximum value in control plot (31.65 sq.m/ha); - the mean diameter ranges between 5.60 cm (control plot) and 10.19 cm (RDP2); - the mean height is less variable than the mean diameter and ranges between 7.56 m (control plot) and 8.42 m (RDP 2); - the mean slenderness index h/d is the highest (over 130) in control plot and lowest (96) in RDP2; - the variability of potential final crop trees in terms of their mean diameter, mean height and mean slenderness index is much lower than in case of overall trees found in the three R&D plots
Anahtar Kelimeler
Silver fir, Abies alba, stand density, mean values, basal area
