Dynamics of evapotranspiration and its relationship with drought in a grain-forage compound ecosystem on the Loess Plateau

• LI Jiaxuan, 
• LI Huipeng, 
• BAI Lu, 
• ZHANG Jingui, 
• WANG Ruobing, 
• XIANG Qian, 
• LYU Long, 
• MA Jingyong