1. Chair of Forest Operations, University of Freiburg, Werthmannstr. 6, 79085 Freiburg, Germany
2. Water and Land Institute (IAT), Curitiba 80215-100, Brazil
3. Department of Forest Engineering and Technology, Federal University of Parana (UFPR), Av. Prefeito Lothário Meissner 632, Curitiba 80210-170, Brazil