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该文的目的是研究无霜期变化对全球变暖的响应及其对粮食产量的影响。利用1961~2013年河南省17个测站均一化的逐日地面0 cm最低气温资料,根据霜冻气候指标计算了各站逐年的初、终霜日期,在此基础上分析了过去53年河南省初、终霜日期和无霜期的时空变化特征,并探讨了无霜期的变化对粮食产量的影响。结果表明:1近53年来,河南省平均初霜日期以2.2 d/10 y的速率显著推迟,平均终霜日期以2.4 d/10 y的速率显著提前,受此影响无霜期以4.5 d/10 y的速率延长;2就空间变化而言,初霜期推迟最为明显的地区位于河南西部地区,中、南部平原地区终霜期提前最为明显。东部地区初、终霜日期和无霜期变化趋势不明显;31961~2013年河南省无霜期的变化与主要粮食产量呈显著正相关,无霜期每提前1 d,粮食总产量、稻谷、小麦和玉米分别提高79.5、90.0、79.5和70.5 kg/hm2。
The purpose of this paper is to study the response of frost-free period to global warming and its impact on grain yield. Based on the daily 0 cm minimum air temperature data of 17 stations in Henan Province from 1961 to 2013, the yearly initial and final frost dates of each station were calculated according to the frost weather indices. Based on this, , The final frost date and frost-free period, and discussed the effect of frost-free period on grain yield. The results showed that in the past 53 years, the average initial frost date of Henan Province was significantly delayed at a rate of 2.2 d / 10 y, and the average final frost date was advanced significantly at a rate of 2.4 d / 10 y. Affected frost-free period was 4.5 d / 10 y ; 2 In terms of spatial variation, the area with the most early postponement of initial frost is located in the western part of Henan Province. The final frost period is most obvious in the middle and southern plains. The change of frost-free date in early and late frost season in eastern China was not obvious. The change of frost-free period in Henan from 31961 to 2013 was positively correlated with the main grain yield. The total grain output, grain, wheat and maize increased by 79.5 , 90.0, 79.5 and 70.5 kg / hm2.