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华北地区冬小麦干旱时空分布特征

, PP. 18-25

Keywords: 作物气候指标距平,时空分布特征,经验正交函数,小波分析

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Abstract:

根据作物气候指标距平,利用经验正交函数和小波分析方法,研究了华北地区冬小麦干旱的空间分布和时间演变特征。研究结果表明,主要有3种空间分布类型:以中西部为中心的全区一致型;西北、东南相反分布型,其正值中心分布在北京、霸州等区域,负值中心分布在济南、淄川、临沂等区域;东、西相反分布型,其正值中心分布在河北省东北部的唐山、秦皇岛和山东省的烟台、福山、海阳为等区域,负值中心分布在河北省的邢台、石家庄以及河南省的安阳和新乡等区域;3种空间分布型时间系数变化趋势都表明,20世纪90年代以后华北地区冬小麦干旱呈加重的趋势。

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