This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Daniela Kellerová
The Institute of Forest Ecology of the Slovak Academy of Sciences, Štúrova 2, 96053 Zvolen, The Slovak Republic
Rastislav Janík
The Institute of Forest Ecology of the Slovak Academy of Sciences, Štúrova 2, 96053 Zvolen, The Slovak Republic