长沙晚稻生长季降水量及干旱特征分析

Analysis of Precipitation and Drought Characteristics of Late Rice Growing Season in Changsha

使用1960—2018年望城坡站、马坡岭站、浏阳站、宁乡站6月20日到10月20日(晚稻生长季)的地面观测资料,通过数理统计方法,对其长沙晚稻生长季的降水量以及气象干旱特征进行分析。分析结果表明:长沙晚稻生长季的降水量有增加的趋势,最大降水量为1 034.0 mm,最小降水量为205.0 mm,极差为829.0 mm,降水量波动大,极差大。总体上看,在晚稻生长季中浏阳的降水量最多,马坡岭最少,但浏阳和马坡岭出现气象干旱的频率都较高,其中马坡岭干旱的程度相对较高,且从1960年后开始每隔十几年会出现一次特大旱。

Based on the ground observation data of Wangchengpo,Mapoling,Liuyang and Ningxiang stations from June 20 to October 20(late rice growing season)during the past 60 years from 1960 to 2018,the precipitation and meteorological drought characteristics of late rice growing season in Changsha were analyzed by means of mathematical statistics.The results showed that the precipitation of late rice growing season in Changsha had an increasing trend.The maximum precipitation was 1 034.0 mm,the minimum precipitation was 205.0 mm,the range was 829.0 mm,and the precipitation fluctuated greatly in recent 60 years.Generally speaking,in the late rice growing season,the precipitation in Liuyang is the largest and that in Mapoling is the smallest,but the frequency of meteorological drought in Liuyang and Mapoling is relatively high,and the degree of drought in Mapoling is relatively high,and from 1960 onwards there will be a severe drought every a dozen years.