摘要
利用1971—2006年六盘水市逐日平均气温资料,采用累积距平法、Morlet小波分析等方法,对六盘水市秋风天气的年际、年代际变化、周期变化特征及其对水稻产量的影响等进行了分析。结果表明:六盘水市秋风天气北部较重,南部较轻;秋风强度具有明显的年际及年代际变化。在年代际尺度上存在显著的准14年周期振荡,在年际尺度上存在准6年的周期振荡。目前六盘水秋风强度变化处于转折时期,即由偏强的趋势向偏弱的趋势转变,秋风天气严重影响了六盘水市的水稻产量。
The periodicity temperature change characteristic of Liupanshui city in autumn and its effect on rice yield were discussed through analyzing the average diurnal temperature data by using CA and Morlet methods. The results showed that the occurrence frequrency of low temperature in northern Liupanshui city was higher than that in southern Liupanshui in autumn and its intensity had the obvious inter-annual and decennial variability. There was a significant periodicity vibration every 14 years in decennial variability and a periodicity vibration every 6 years in inter-annual variability. The strong trend of low temperature in autumn is being changed into the weak trend of low temperature and the low temperature in autumn seriously affects rice yield in Liupanshui city.
出处
《贵州农业科学》
CAS
2008年第5期42-44,共3页
Guizhou Agricultural Sciences
关键词
六盘水
秋风
气候特征
水稻
产量
Liupanshui
low temperature in autumn
climatic feature
rice
yield
