Reproductive allocation of Elymus nutans under different planting densities and nitrogen fertilizing treatments

• Jian-wei NIU, 
• Zhan-Lan LEI, 
• Hua-kun ZHOU, 
• Ze-hua LIU, 
• Rui-ling HUANG, 
• Bu-qing YAO, 
• Wen-ying WANG, 
• Xin-quan ZHAO