Photosynthetic gas exchange and chlorophyll fluorescence parameters in response to illumination intensity in leaves of Lespedeza davurica under different light environments

• Xin Li, 
• Hui-hui Zhang, 
• Xiu-li Zhang, 
• Nan Xu, 
• Ju-wei Hu, 
• Hao-sheng Pang, 
• Zhi-yuan Teng, 
• Guang-yu Sun