JIANG Nan,YUAN Shujie,LIU Zhihan,et al.Space-time Distribution of Continuous Cold Rainy Weather on Rice during Tillering-jointing Stage in Sichuan Province[J].Journal of Chengdu University of Information Technology,2022,37(02):194-201.[doi:10.16836/j.cnki.jcuit.2022.02.013]
四川水稻分蘖拔节期低温连阴雨时空特征
- Title:
- Space-time Distribution of Continuous Cold Rainy Weather on Rice during Tillering-jointing Stage in Sichuan Province
- 文章编号:
- 2096-1618(2022)02-0194-08
- 分类号:
- P49
- 文献标志码:
- A
- 摘要:
- 利用四川省水稻种植区21个农业气象观测站1961-2020年逐日平均气温、日照时数和日降水量等气象资料,按照水稻低温、连阴雨和低温连阴雨标准,使用统计方法分析水稻分蘖-拔节期低温、连阴雨和低温连阴雨的时空分布特征。结果表明:(1)轻度和中度低温灾害发生最多的年份分别为1985年、1983年,发生最少的年份分别为2015年、2017年,20世纪80年代以来不同等级低温灾害发生站数的年际均值均呈显著减少趋势。在空间分布上,轻度、中度和重度低温灾害发生频率范围分别为23.3%～100.0%、1.7%～100.0%和0%～96.0%,高值区分布在川西南山地的雷波、越西、木里、盐源和昭觉,低值区分布在盆周边缘山区和盆中浅丘区的广元和资阳,呈现“山区多,盆地少”的空间分布特征。(2)连阴雨灾害发生最多的年份为1973年,最少的年份为2020年。在空间分布上,轻度、中度和重度连阴雨灾害发生频率范围分别为8.3%～48.3%、1.7%～25.0%和0%～11.7%,高值区分布在盆南丘陵区和川西南山地的宜宾、昭觉和越西,发生频率由高值区向南北方向递减。(3)低温连阴雨灾害发生最多的年份为2004年,21世纪00年代中期以来,低温连阴雨发生站数的年际均值逐渐减小,近10 a平均发生站数为3.9。在空间分布上,低温连阴雨灾害发生频率高值区分布在川西南山地北部的雷波、越西和昭觉,发生频率范围为50.0%～65.0%,向南北方向递减。(4)除重度连阴雨灾害外,1991年以后各等级低温、连阴雨和低温连阴雨灾害发生频率均略低于1990年以前; 相较于低温灾害,连阴雨和低温连阴雨灾害发生站数少,灾害范围小。
- Abstract:
- According to the disaster standards of low temperature, continuous rain and continuous cold rainy weather, the spatial and temporal distribution of low temperature, continuous rain and continuous cold rainy weather were analyzed by using of statistics method based on daily average temperature, sunshine hours and precipitation from 1961 to 2020 at 21 agrometeorological observation stations during tillering-jointing stage of rice in Sichuan Province. The results showed as follows:(1)The mild, moderate and severe low temperature occurred most in 1985 and 1983 while least in 2015 and 2017. The number of stations with different grades of low temperature disaster showed a significant decreasing trend from 1980s. The frequency range of mild, moderate and severe low temperature was 23.3%-100.0%, 1.7%-100.0% and 0%-96.0%. The low temperature often occurred in the Leibo, Yuexi, Muli, Yanyuan and Zhaojue of mountain area of southwest Sichuan. The distribution of low temperature showed “multi in mountainous and less in basin”.(2)The continuous rain occurred most in 1973 while least in 2020. The frequency range of mild, moderate and severe continuous rain was 8.3%-48.3%,1.7%-25.0% and 0%-11.7%. The continuous rain often occurred in the Yibin, Zhaojue and Yuexi of hilly area of southern basin and mountain area of southwest Sichuan. The frequency showed a diminishing trend from the high-value area to the south and north.(3)The continuous cold rainy weather occurred most in 2004. The number of stations of continuous cold rainy weather showed a decreasing trend from the mid-2000 s, the annual mean of the number in recent 10 years is 3.9. The continuous cold rainy weather often occurred in the Leibo, Yuexi and Zhaojue of mountain area of southwest Sichuan, with a frequency range of 50.0% to 65.0%, declining to the south and north.(4)Except for severe continuous rain disasters, the frequency of different grades of low temperature, continuous rain and continuous cold rainy weather after 1991 was slightly lower than before 1990. Compared with low temperature disasters, continuous rain and continuous cold rainy weather have fewer stations and smaller disaster scope.
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备注/Memo
收稿日期:2021-10-09
基金项目:四川省科技计划资助项目(2021YJ0280); 气象灾害预测预警与应急管理研究中心开放研究基金资助项目(ZHYJ20-YB02)