We found slightly worse increment of beech than expected, the transition periods between developmental phases and the production periods for various target dimensions are longer than expected. Some values differ significantly from the results of growth&yield research. This may be due to methodological reasons, as the research methods differ. We found very large differences in the dbh increment of beech. Much of this variability can be explained by the tree (41%) and stand (11%) parameters, environmental parameters accounts for only 2% to the variability. Our model explained only slightly less variability than a similar model for the increment in the Austrian beech forests.
COBISS.SI-ID: 3529894
We present a complete overview of site productivity of beech sites in Slovenia based on research in 21 macroassociations in all phytogeographical areas (362 plots). SI100 ranges between 11 and 40 m, the (unweighted) average on macroassociations amounts to 26,3 m. MAImaks ranges from 2.7 m3/ha and 13.2 m3/ha/year, the average is 7.3 m3/ha year. Site productivity (SI100 and MAImaks) is influenced by altitude, rockiness, slope, and aspect. All variables have a negative impact. In total, we explained 50.9% of the variance in SI100 (R2 = 0.509) and 49.5% in MAImaks (R2 = 0.495). The largest proportion of variance is explained by the altitude gradient, the other factors contribute significantly less.
COBISS.SI-ID: 3527078
A total of 285 plots in adult even-aged stands dominated by Norway spruce were analysed. About half of the site index variance was explained by elevation. Using multivariate regression, 78% of site index variance was explained, exposing elevation and soil type as the most influential factors. Site index decreases with elevation, relative elevation (ratio between elevation of analysed location and the local peak of the mountain massif) and inclination. Moreover, site index is higher on silicate bedrock, on sinkhole land and on ridges. Site productivity of spruce is also lower on mor humus substrate, and on positions where the sum of summer sun irradiation is below 700 hours.