共和地区春小麦生长季热量资源变化特征

Variation Characteristics of Heat Resources in Spring Wheat Growing Season in Gonghe Region

利用1961—2018年青海省共和县气象局观测的逐日平均气温资料,采用线性趋势、滑动平均、Mann-Kendall法等数理统计方法分析了春小麦生长季平均气温、气温稳定通过0、5、10℃积温的变化趋势及突变特征。结果表明,近58年共和地区春小麦生长季平均气温以0.37℃/10 a的速率呈极显著升温趋势。春小麦生长季气温稳定通过0、5、10℃积温也呈极显著增温趋势,近58年气温稳定通过0、5、10℃积温分别增加418.0、449.8、568.2℃·d,且2000年以后热量资源增加更显著。春小麦生长季平均气温的突变时间从1991年开始,突变后平均气温较突变前升高了1.2℃。春小麦生长季气温稳定通过0、5℃积温的突变时间分别为1993和1994年,气温稳定通过10℃积温的突变时间为1988年。

Using the daily average temperature data observed by the Meteorological Bureau of Gonghe County,Qinghai Province from 1961 to 2018,the linear trend,the moving average,the Mann-Kendall method and other mathematical statistics methods were used to analysis the variation trend and mutation characteristics of the average temperature and the accumulated temperature at 0,5 and 10℃in spring wheat growing season.The results showed that the average temperature of spring wheat growing season in Gonghe region from 1961 to 2018 showed extremely significant warming trend at a rate of 0.37℃/10 a.The temperature stability through 0,5 and 10℃accumulated temperature also showed extremely significant temperature increase trend in spring wheat growing season.In the past 58 years,the temperature stability through 0,5 and 10℃accumulated temperature had increased by 418.0,449.8,568.2℃·d,respectively,and after 2000,the increase in thermal resources was more significant.The sudden change of the average temperature in spring wheat growing season began in 1991,the average temperature after the mutation increased by 1.2℃before the mutation.The mutation time of the temperature stability through 0 and 5℃accumulated temperature was 1993 and 1994,respectively,and the mutation time of the temperature stability through 10℃accumulated temperature was 1988.