Niche Characteristics of Potaninia mongolica Community in the Lower Reach of Shiyang River

• ZHAO Huihong, 
• ZENG Xinde, 
• ZHANG Youjia, 
• WANG Chengxun, 
• LI Weilong, 
• XU Fangrong, 
• JIA Bingbing, 
• ZHANG Jie