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中国农作物成灾面积的演化趋势及波动特征研究

DOI: 10.13577/j.jnd.2015.0403, PP. 15-23

Keywords: 农作物成灾面积,波动性,粮食生产区,经验模态分解,方差分解模型,中国

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Abstract:

综合运用经验模态分解法、剩余法和方差分解法,系统分析了1978―2012年中国农作物成灾面积的演化趋势、波动特征及引起成灾面积波动的灾害类型差异和地区差异,旨在为中国农业生产防灾减灾提供科学依据。结果表明:(1)农作物成灾面积"先增后降",旱灾和水灾是主要灾害类型:成灾面积主要分布在长江中下游区,黄淮海区和黄土高原区。(2)农作物成灾面积的波动特征明显,存在3a和8a左右的准周期波动。(3)在灾害类型上,旱灾和水灾成灾面积波动的总方差贡献为91.77%,是中国农作物成灾面积波动的主要灾害类型。(4)从八大粮食产区看,长江中下游区农作物成灾面积波动的总方差贡献率最大,其次为东北区和黄淮海区,应重点关注这几个地区的成灾面积变化和波动。

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