TY - Journal of Geographical Sciences A1 - Huimin YAN, Fang LIU, Zhongen NIU, Fengxue GU, Yanzhao YANG T1 - Changes of multiple cropping in Huang-Huai-Hai agricultural region, China Y1 - 2018-11-20 09:36:03.897 JF - Journal of Geographical Sciences JO - Journal of Geographical Sciences SP - 1685 EP - 1699 VL - 28 IS - 11 UR - {https://www.geogsci.com/EN/10.1007/s11442-018-1537-2} N1 - 10.1007/s11442-018-1537-2 ER -