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中文摘要：
将波动理论应用于粮食产量变化的分析，采用波动系数、波动周期等指标来研究粮食产量的波动规律，并将粮食产量的波动周期与国家粮食政策和自然灾害结合起来，定性分析了国家政策和自然灾害对粮食产量的影响，最后提出了稳定粮食产量的政策建议：利用国际市场的贸易机制、保持粮食政策的持续性和稳定性、健全粮食生产预警机制等。
英文摘要：
This paper applies fluctuation theory into the study of the changes of grain yield, taking fluctuation coefficient and fluctuation cycle as two indexes in studying the fluctuation hales of grain yield. It connects the fluctuation cycles of grain yield with change periods of national grain policy and natural disasters, and makes qualitative analyses of the influence of national policy and natural disasters on grain yield. Suggestions are put forward, such as employing the intemational trade mechanism, keeping the stability and sustainability of grain policy and improving the contingency mechanism of grain yield.
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