高纬度半干旱地区年际间气象因子变化及对春玉米产量的影响

制定半干旱地区玉米栽培技术措施以及选择适宜当地种植的品种,对连续6a玉米产量和气象数据进行分析,探讨影响玉米产量的主要气象因素的作用效果。结果表明:近6年生长季气温变化幅度较小,活动积温受霜期影响较大;降雨量高于往年平均水平,各月份降雨量时空分布不均匀,易发生春旱、夏涝现象。降雨量的多少及其时空分布情况、个别年份的早霜和晚霜等灾害性天气是玉米年际间产量波动的主要限制性气象因素。

Influence of Meteorological Factors Change on Yield of Spring Maize in High Latitude and Semi Arid Region

In order to make a cultivation technique measures of maize in semi‐arid areas ,and choose suitable vari‐eties ,maize yield and meteorological data for six consecutive years were analyzed to explore the effect of the main meteorological factors on the maize yield .The results showed that the growing season temperature changed less in recent six years ,but the active accumulated temperature was affected greatly by frost period . Rainfall was above average level of previous years ’ and each month the rainfall was uneven in temporal and spatial distribution ,which lead to the phenomenon of spring drought and summer flood .The amount of rainfall and its temporal and spatial distribution ,early and late frost in individual year ,and other disastrous weather were the main limiting meteorological factors which caused the annual fluctuation of maize yield .