1. Khakass Technical Institute, Siberian Federal University, 655017 Abakan, Russia
2. Institute of Ecology and Geography, Siberian Federal University, 660036 Krasnoyarsk, Russia
3. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
4. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China
5. Department of Dendroecology, V.N. Sukachev Institute of Forest, Siberian Branch of the Russian Academy of Science, 660036 Krasnoyarsk, Russia