1. a Forest Policy Laboratory, Department of Forest Science, Faculty of Agriculture , Shinshu University , 8304 Minamiminowa-Mura, 399-4598, Nagano-Ken, Japan
2. b Administration Cadre of Bangladesh Civil Service, Govt. of the Peoples' , Republic of Bangladesh
3. c Department of Forestry and Environmental Science, School of Agriculture and Mineral Sciences , Shahjalal University of Science and Technology , Sylhet-3114, Bangladesh
4. d Laboratory of Forest Environment and Ecology, Department of Forest Science, Faculty of Agriculture , Shinshu University , Nagano-Ken, Japan