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
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Change in grain production in China and its impacts on spatial supply and demand distributions in recent two decades
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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 |
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