【摘要】 利用1961—2017年江西省23个代表站逐日气温资料和1984—2017年14个农业气象观测站晚稻发育期资料,根据晚稻不同发育阶段,采用数理统计方法分析了晚稻寒露风的时空演变特征。结果表明:江西省(简称"赣")轻度寒露风在9月中旬前出现的频率最高,赣北地区约3 a一遇,赣中地区约10 a三遇,赣南地区约5 a一遇,且由东南向西北呈增多趋势。中度寒露风在9月中旬前出现的频率较低,赣北、赣中约10 a一遇,赣南约20 a一遇;重度寒露风在9月中旬前出现的频率极低,赣中、赣北分别为0.4%和1.2%;中、重度寒露风由南向北呈逐渐增多趋势。轻度寒露风在晚稻幼穗分化到抽穗扬花阶段出现的频率为34.1%,灌浆阶段为26.9%;中度寒露风在晚稻幼穗分化到抽穗扬花阶段出现的频率为7.5%,灌浆阶段为8.0%;重度寒露风对晚稻的影响相对较小,在各发育阶段出现的频率均不到2%。更多还原

【Abstract】 Based on the data on the daily temperature of the 23 representative stations from 1961 to 2017 and the growth period of double-cropping late rice of the 14 agricultural meteorological observation stations in Jiangxi province from 1984 to 2017,the spatio-temporal variation characteristics of cold-dew wind in different developmental stages of late rice were analyzed using the mathematical-statistical method.The results show that the mild cold-dew wind occurs in the highest frequency before mid-September in Jiangxi province.Specifically,it occurs once every 3 years in northern Jiangxi,three times every 10 years in central Jiangxi,and once every 5 years in south Jiangxi,and its frequency of occurrence increases gradually from southeast to northwest.The frequency of moderate cold-dew wind is relatively lower before mid-September in Jiangxi province and is once every 10 years in northern and central Jiangxi and once every 20 years in south Jiangxi.The frequency of severe cold-dew wind is extremely low before mid-September in Jiangxi province and is 0.4% and 1.2% in central and northern Jiangxi,respectively.Meanwhile,the frequencies of moderate and severe cold-dew wind increase gradually from south to north.The frequencies of mild and moderate cold-dew wind are 34.1% and 7.5% from the panicle differentiation stage to heading and flowering period of late rice and are 26.9% and 8.0% in the grain-filling period,respectively.The severe cold-dew wind has a relatively small effect on late rice and its frequency of occurrence is less than 2%in each developmental period of late rice.更多还原