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