Variation of response in Cleistogenes songorica above-ground part functional traits to long-term grazing in a desert steppe

• Jiang-wen Li, 
• Guo-dong Han, 
• Zhi-guo Li, 
• Zhong-wu Wang, 
• Kangsarula, 
• Hai-yan Ren, 
• Feng-yuan Yu