1. a Department of Rangeland and Watershed Management, Gorgan University of Agriculture and Natural Resources, Gorgan, Iran
2. b Rangeland Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization, Tehran, Iran
3. c Faculty of Agriculture Management, Gorgan University of Agriculture and Natural Resources, Gorgan, Iran
4. d Human Geography Group, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran
5. f Division of Natural Resource Economics, Kyoto University, Kyoto, Japan