Currently, there is interest in restoring the structure and composition of some mountain forests towards pre-settlement conditions. One of the tasks is to gain a better understanding of the natural disturbance processes that affect these forests. We reconstructed the dynamics of a mixed old-growth stand using a combination of age structure and dendroecological analyses, and historical evidence of past human activities. The results suggest that periodic, intermediate severity wind disturbances may have had an important influence on forest dynamics in the Alps also in the past.
The study of Dinaric silver fir-European beech forests used archival data from old forest management plans for the period 1789-2004 and red deer harvesting records for the period 1907-2006. In the analysed period, the fir population aged and fir and beech alternated in dominance. The study revealed a strong impact of red deer on the composition and density of tree regeneration, especially on silver fir regeneration. The changes in red deer density and past forest management practices were the main factors driving the population dynamics of fir in the study area during the past 2 centuries.
Spatiotemporal dynamic of European beech was analysed using data acquired from information system Silva-Si. Beech expanded its area by more than 1200 ha per year on average and its proportion in growing stock increased from 27% to 32%. Expansion was more pronounced at lower altitudes, on sites with steep topography, and on sites with a higher proportion of beech in potential natural vegetation. The distance to the nearest compartment with beech and the proportion of early successional phases influenced its expansion. The developmental dynamics indicates a further expansion of beech.
We have established how to plan in advance new skidding systems which involves changing the skidding map. We have built new model skidding maps, using terrain classification and decision support systems for forwarders and tractor trailers. In the first phase the criteria for selection of skidding means were determined, and then this model was applied to the study area. In the third step model maps were compared to the reference map. We have determined, that the terrain allows for more forwarding, than suggested by the reference skidding map.
Samples of dying branches from 121 trees (Q.pubescens, Q.cerris, Q.petraea) were analysed from 102 sites. We found 44 adult insects: 45% were from the Cerambycidae family, 18% were from the Scolytinae subfamily, 4% from the Buprestidae fam., 4.5% from the Cleridae fam., and 28.5% from other families. Signi?cant di?erence in the abundance of adult insects and larvae with regard to the diameter of branch sections and the host species were found. Species of the Buprestidae, Scolytinae, and Cerambycidae represent important factors in the decline in oak vitality in the Karst region of Slovenia.