1. College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
2. Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture/Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu, Sichuan, China
3. Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu, Sichuan, China
4. College of Agronomy, Sichuan Agricultural University, Chengdu, Sichuan, China