Effects of Blue Film on Photosynthetic Parameters and Seedling Growth of Populus schneideri Seedlings

• CHEN Zhihua, 
• LIU Jinping, 
• MA Shaojie, 
• ZHANG Xiaolin, 
• WANG Jingmin, 
• KUI Mengyi, 
• HE Chengzhong, 
• ZONG Dan