1. Forestry Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran
2. Department of Forestry, Khalkhal Branch, Islamic Azad University, Iran
3. Department of Forestry and Forest Economics, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Alborz, Iran
4. Department of Agricultural and Forest Sciences, University of Tuscia, Viterbo, Italy