Comprehensive response of Medicago sativa when used to ecologically remediate a site in the eastern region of the Loess Plateau contaminated with different concentrations of oil

• SONG Xi, 
• WANG Jincheng, 
• JING Mingbo, 
• LIU Guangxiu, 
• CHEN Tuo, 
• WU Shengwei, 
• ZHOU Tianlin