【摘要】 采用陇东15个气象站1965~2005年冬季积温和1981~2005年环县、西峰、平凉代表站小麦发育期的资料,分析了冬小麦发育期的变化规律,探讨了冬季积温对冬小麦发育期的影响。结果表明,陇东冬季积温2000年以来持续为正距平,1965~2005年积温增加率为4.5℃.d/a,陇东冬小麦发育期1994年以后基本持续变早。3个代表站的冬季积温与冬小麦各发育期呈负相关,西峰的相关性明显,最显著的是返青期,其次是抽穗期,再是起身期。冬小麦平均发育期冬季积温典型偏高年份比典型偏低年份均早,环县最明显的是全生育期提前了17 d,其次是开花期提前了15 d,再是起身期提前了12 d,西峰最明显的是全生育期提前了21 d,其次是起身期提前了19d,再是返青期提前了17 d,平凉最明显的是开花、乳熟期均提前了7 d,其次是起身期提前了6 d,再是孕穗、抽穗期提前了5 d。更多还原

【Abstract】 With the data of winter accumulation temperature in 15 weather stations from 1965 to 2005,and the data of winter wheat’s development periods from 1981 to 2005 in three representative stations,the change course was analysed.The influence of winter accumulation temperature to winter wheat’s period of duration was discussed by using the method of correlation coeffient computation and the contrast between typical years.The result indicated that the accumulation temperature has been positive departure since 2000,and the accumulation temperature increased at the rate of 4.5 ℃·d/a from 1965 to 2005.The growth period of winter wheat in East Gansu has become earlier since 1994.The correlation between accumulation temperature assumes and the winter wheat’s development periods are negative.The correlation is the most obvious in Xifeng.Turning green is the most remarkable growth period,next is the earring period,then is setting-out period.更多还原