Interannual variations in the responses of plant functional traits to mowing and nitrogen addition in an Inner Mongolian typical steppe

• LI Xu, 
• WANG Jiazhi, 
• MA Wenhong, 
• YANG Yu, 
• LI Xiangyu, 
• WANG Mingchen, 
• LIU Xinliang, 
• HU Jinxiang, 
• WANG Yonghui