中国人地关系的历史演变过程及影响机制 |
李小云, 杨宇, 刘毅 |
The evolution process and its mechanism of man-land relationship in China |
Xiaoyun LI, Yu YANG, Yi LIU |
图2 中国古代粮食生产和需求演变 注:按传统社会人均年需求原粮696市斤计算。 |
Fig. 2 The evolution of grain production and demand in ancient China |
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