1. Department of Forest Ecology, Mendel University in Brno, Zemedelska 3, 613 00 Brno, Czech Republic
2. Data Processing, Ořechovka 1727, 696 62 Strážnice, Czech Republic
3. Department of Silviculture, Mendel University in Brno, Zemedelska 3, 613 00 Brno, Czech Republic