| Name of article: | Vplyv pestovných opatrení a prírodných disturbancií na hrúbkový prírastok porastov v prebudove na výberkový les |
|---|---|
| Number: | 4 |
| Year: | 2014 |
| Author: | Ján Jaďuď, Milan Saniga, Miroslav Balanda |
The paper deals with an effect of natural disturbances and silvicultural interventions on the radial growth of two tree stands under the conversion to selection forest. We were intended to answer two research objectives. First, we were interested in the effect of wind disturbances and silvicultural interventions on the radial growth of canopy Norway spruces in conversed stands. The growth changes (%) of the radial increment were analyzed in detail. Second, the growth response of lower layer trees on the performed silvicultural intervention was analyzed. The research should characterize the growth response, its intensity and temporal pattern. In total, 21 of canopy N. spruce trees and 30 sub-canopy (lower layer) individuals of silver fir were sampled. The radial growth of canopy trees revealed significant disturbance impact in the decades 1870 and 1930. More than 30% of canopy trees showed the positive response to the performed silvicultural interventions. Considering the growth of fir in the lower layer, the positive effect of silvicultural intervention was confirmed for 24% of trees, whereas the increase of radial growth was recognizable two years after the treatment performed. Regarding the preservation of increased annual increment, we can state a high variability of this parameter. The increment of responding trees decreased to former values after 7 years, on average. The age of canopy trees was 144 ± 32 years. We did not confirm the significant relation between the diameter (dbh) of canopy trees and their physical age. The average age of trees in lower layer was 25 ± 5 years. Contrary to canopy cohorts, the positive correlation (r = 0.49) between the tree diameter and its age was proved.
