TY - SCIENTIA GEOGRAPHICA SINICA A1 - CHENG Ye-Qing, ZHANG Ping-Yu T1 - Regional Patterns Changes of Chinese Grain Production and Response of Commodity Grain Base in Northeast China Y1 - 2005-09-20 00:00:00.0 JF - SCIENTIA GEOGRAPHICA SINICA JO - SCIENTIA GEOGRAPHICA SINICA SP - 513 EP - 520 VL - 25 IS - 5 UR - {http://geoscien.neigae.ac.cn/EN/10.13249/j.cnki.sgs.2005.05.513} N1 - 10.13249/j.cnki.sgs.2005.05.513 ER -