21 Cheng G D, Wu T H. Responses of permafrost to climate change and their environmental significance, Qinghai-Tibet Plateau. J Geophys Res, 2007, 112, F02S03, doi: 10.1029/2006 JF000631
[9]
22 Wu Q B, Zhang T J. Changes in active layer thickness over the Qinghai-Tibetan Plateau from 1995 to 2007. J Geophys Res, 2010, 115: D09107, doi: 10.1029/2009JD012974
[10]
23 Zhao L, Wu Q B, Marchenko S S, et al. Thermal state of permafrost and active layer in Central Asia during the International Polar Year. Permafr Periglac Proc, 2010, 21: 198-207??
[11]
24 Wu Q B, Zhang T J, Liu Y Z. Permafrost temperatures and thickness on the Qinghai-Tibet Plateau. Glob Planet Change, 2010, 72: 32-38??
[12]
28 Zhao L, Ping C L, Yang D Q, et al. Changes of climate and seasonally frozen ground over the past 30 years in Qinghai-Xizang (Tibetan) Plateau, China. Glob Planet Change, 2004, 43: 19-31??
25 Ge S, Wu Q B, Lu N, et al. Ground water in the Tibet Plateau, western China. Geophys Res Lett, 2008, 35: L18403, doi: 10.1029/2008GL034809??
[29]
26 Yi S H, Zhou Z Y, Ren S L, et al. Effects of permafrost degradation on alpine grassland in a semi-arid basin on the Qinghai-Tibetan Plateau. Environ Res Lett, 2011, 6: 045403??
[30]
27 Liu X D, Chen B D. Climate warming in the Tibetan Plateau during the recent decades. Int J Climatol, 2000, 20: 1729-1742 ??