Phytoremediation of crude oil-contaminated soils using a wild ornamental plant Gerbera jamesonii in eastern Gansu Province of the Loess Plateau

• WANG Jincheng, 
• JING Mingbo, 
• ZHOU Lihui, 
• LIU Guangxiu, 
• WU Shengwei, 
• ZHOU Tianlin