OALib Journal期刊
ISSN: 2333-9721
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冬季气候变暖对山西省冬小麦可种植区的影响
DOI: 10.11821/dlxb201405010, PP. 672-680
Keywords: 气候变暖,冬小麦,冬季,可种植区,山西省
Abstract:
基于山西省境内较为均匀分布的70个地面气象观测站1970-2012年冬季逐日气温资料,采用线性倾向估计法分析了负积温、最冷月平均气温和年极端最低气温的变化特征,采用累积距平法确定其突变点,以突变点为界分为前后2个时间段,依据前后时间段等值线的变化分析冬季气候变暖对山西省冬小麦可种植区的影响。结果表明山西省负积温呈现显著减少趋势(通过了α=0.01的显著检验),最冷月平均气温和年极端最低气温呈现不显著升高趋势;突变后,负积温平均减少了103.4℃,最冷月平均气温和年极端最低气温分别升高了0.8℃和0.7℃;在3个指标中,决定山西省冬小麦能否种植的关键因子是负积温和年极端最低气温,最冷月平均气温的影响较小;冬季气候变暖后,平均状况下,冬小麦可种植区域面积扩大了约2.9×106hm2,扩大52%,80%保证率下,冬小麦种植面积扩大了约2.3×106hm2,扩大79%。
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