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近20年中国粮食生产变化特征及其对区域粮食供需格局的影响
刘正佳1,2,3(), 钟会民1,2, 李裕瑞1,2, 文琦4(), 刘雪琦5, 简钰清6
Change in grain production in China and its impacts on spatial supply and demand distributions in recent two decades
LIU Zheng-jia1,2,3(), ZHONG Hui-min1,2, LI Yu-rui1,2, WEN Qi4(), LIU Xue-qi5, JIAN Yu-qing6

图2. Y 1999-2003和Y 2014-2018两个时段全国/南方/北方主要粮食作物产量

Fig. 2. Yield changes of five-type crops in two typical periods Y1999-2003 and Y2014-2018