1Department of Forest Management, Faculty of Forestry and Wood Sciences,
Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Praha 6 – Suchdol, Czech Republic
2Forest Research, Inventory and Monitoring (FORIM), Huta 14, 962 34 Železná Breznica, Slovakia
3National Forest Centre – Forest Research Institute Zvolen, T. G. Masaryka 22, SK-960 92 Zvolen, Slovakia
4Secondary Forestry Training School, Medvedzie 135, 027 47 Tvrdošín, Slovakia
Pol. J. Environ. Stud. 2012;21(5):1327–1337