近60年大连市农业界限温度变化特征分析

Analysis on Variation Characteristics of Agriculture Critical Temperature in Dalian City during Recent 60 Years

利用大连市近60年的日平均气温资料,对稳定通过≥0℃、≥10℃的积温和积温日数及其变化率的特征进行了分析,探讨大连市农耕期各界限温度的变化特征。结果表明,近60年来大连市稳定通过≥0℃、≥10℃的积温和积温日数均呈上升趋势,其中稳定通过0℃积温、积温日数比稳定通过10℃的上升趋势显著。除第1个30年稳定通过0℃积温呈非常缓慢的递减趋势外,其余各时间阶段通过0和10℃的积温呈递增趋势,且前期递增趋势较弱,后期增强,第3个30年最强。稳定通过0和10℃的积温日数各阶段均呈递增趋势,后期较前期趋势显著。

The accumulated temperature and accumulated temperature days through 0 and 10 ℃ stably and the variation rate were analyzed by using daily mean temperature data in Dalian City during 60 years.Moreover,the variation characteristics of each limit temperature during farming period in Dalian City were discussed.The accumulated temperature and accumulated temperature days through 0 and 10 ℃ stably in recent 60 years showed a increasing trend and the increasing trend of the accumulated temperature and accumulated temperature days through 0 ℃ stably was stronger than that through 10 ℃ stably.The accumulated temperature through 0 ℃ stably in the first 30 years was decreased,but the accumulated temperature through 0 and 10 ℃ stably in the other stages were increased.The increasing trend was weakest in the first 30 years and that was strongest in the third 30 years.The accumulated temperature days through 0 and 10 ℃ stably were increased in different stages.The increasing trend in the first 30 years was weaker and that was strong later.