1. College of Resources and Environment Science, Hebei Agricultural University, Baoding, China
2. College of Land and Resources, Hebei Agricultural University, Baoding, China
3. College of Agronomy, Hebei Agricultural University, Baoding, China
4. State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
5. Key Laboratory for Farmland Eco-Environment of Hebei, Agricultural University of Hebei, Baoding, China