Tomáš Bucha, Forest Research Institute, National Forest Centre (NFC), T.G. Masaryka 22, 960 92 Zvolen, Slovak Republic; e-mail: bucha@nlcsk.org
Ján Feranec, Institute of Geography of the Slovak Academy of Science (IG SAS), Štefánikova 49, 814 73 Bratislava, Slovak Republic, e-mail: feranec@savba.sk