Affiliation: | 1. Department of Forestry and Management of the Environment and Natural Resources , Democritus University of Thrace , 193 Pantazidou Street, 68200 Orestiada, Greece emanolas@fmenr.duth.gr;3. Department of Forestry and Management of the Environment and Natural Resources , Democritus University of Thrace , 193 Pantazidou Street, 68200 Orestiada, Greece |