Niche differentiation characteristics of plant functional groups ondegraded grassland in the upstream of Shiyang RiverA case study of Heteropappus Altaicus type grassland

• LIN Li, 
• Cheng-Zhang DIAO, 
• Rui-Jun LONG, 
• WANG Shuai, 
• WANG Xi, 
• Si-Kang LI, 
• Fa-Wei ZHANG