基于相对湿润度指数的黔东南州干湿状况  

Arid and moist conditions in Qiandongnan Miao and Dong Autonomous Prefecture based on relative moisture index

作　　者：文建川 梁平 廖育玲 吴慧 李春生 宋光勇 WEN Jian-chuan;LIANG Ping;LIAO Yu-ling;WU Hui;LI Chun-sheng;SONG Guang-yong(Meteorological Bureau of Congjiang County,Guizhou Province,Congjiang 557400,China;Meteorological Bureau of Qiandongnan Miao and Dong Autonomous Prefecture,Qiandongnan 556000,China;Meteorological Bureau of Liping County,Guizhou Province,Liping 557300,China)

机构地区：[1]贵州省从江县气象局,贵州从江557400 [2]贵州省黔东南州气象局,贵州黔东南556000 [3]贵州省黎平县气象局,贵州黎平557300

出　　处：《江苏农业学报》2023年第4期989-995,共7页Jiangsu Journal of Agricultural Sciences

基　　金：贵州省气象局科研业务项目[黔气科登(2022)04-12号]。

摘　　要：了解黔东南州干湿变化特征,为应对气候变化风险和当地农业生产安排提供科学依据。基于黔东南州16县(市)1974-2020年逐日气象数据,采用Penman-Monteith公式计算蒸散量,并结合降水量推算出相对湿润度指数(I_(RM)),分析其不同时间尺度特征并对比其在雨季和非雨季的时空变化差异。结果表明,除个别年份外,黔东南州年平均及各年代降水量均显著大于蒸散量,I_(RM)大于0,气候总体较为湿润。不同月份的I_(RM)差异显著,4-6月I_(RM)较其余月份明显要大,8月、9月及12月的I_(RM)小于0,发生气象干旱的潜势高。I_(RM)存在较大的季节和空间性差异,雨季I_(RM)明显大于非雨季,各县(市)雨季I_(RM)为6.0%~65.0%,非雨季I_(RM)为-20.4%~25.1%,州北部和南部季节性干旱显著。Characteristics of arid and moist changes of Qiandongnan Miao and Dong Autonomous Prefecture was studied to provide a scientific basis for dealing with climate change risks and arranging local agricultural production.Penman-Monteith formula was used to calculate evapotranspiration based on daily meteorological data of 16 counties(cities)in Qiandongnan Miao and Dong Autonomous Prefecture from 1974 to 2020,and relative moisture index(I_(RM))was calculated by combination of Penman-Monteith formula with precipitation,so as to analyze the characteristics of different time scales and to compare the differences of temporal and spatial changes in rainy season and non-rainy season.The results showed that,except for a few years,the annual average precipitation and annual precipitation of Qiandongnan Miao and Dong Autonomous Prefecture were significantly higher than evapotranspiration,the I_(RM) was above 0,and the climate was generally humid.The I_(RM) of different months showed significant differences,the I_(RM) in April to June was obviously higher than the other months.The I_(RM) was below 0 in August,September and December,and the potential of occurring meteorological drought was high.The I_(RM) showed great differences between different seasons and different spaces,and the I_(RM) in rainy season was obviously higher than in non-rainy season.The I_(RM) of each county(city)in rainy season was 6.0%-65.0%,and the I_(RM) in non-rainy season was-20.4%-25.1%,seasonal drought in northern and southern prefectures was significant.

关 键 词：PENMAN-MONTEITH 湿润度指数 干湿状况 时空变化 

分 类 号：S161.3[农业科学—农业气象学] P467[农业科学—农业基础科学]