豫西烟区烤烟生育期35年日照时数的变化特征

利用豫西烟区(包括三门峡市和洛阳市)10个气象基准站1971-2005年烤烟生育期(5-9月)逐旬日照时数资料,分析了该区域烤烟生育期日照时数的气候变化趋势,同时利用累计距平法和滑动t检验法进行突变检验。结果表明:35a内豫西烟区日照时数变幅较大,并呈逐年下降的趋势,其趋势系数为-25.4h/10a;整个生育期内5月和6月的日照时数最多,9月最少;伸根期日照时数的下降趋势显著(P0.05),其趋势系数(-11.5h/10a)成熟期(-11.3h/10a)旺长期(-2.6h/10a)。三门峡地区烤烟生育期的日照时数大于洛阳地区。突变分析表明,豫西烟区烤烟生育期的日照时数在1981年发生突变。

Characteristics of Sunshine Durations Change at Flue-cured Tobacco Growth Stages Last 35 Years in Western Henan

Based on the meteorological data of sunshine durations in 35 years in the main tobacco growing areas of western Henan,the trend of climate change of sunshine durations at tobacco growth periods was analyzed.Accumulative anomaly analysis and slide T detection methods were used to examine the points with abrupt change of sunshine durations.The results showed that the changes of sunshine durations in western Henan had a rather wide range and had a decreasing trend in last 35 years,with the trend coefficient of-25.4 hrs/10y.Sunshine durations were long in May and June,and short in September.The decreasing trend of sunshine durations was significant（P0.05）in root elongation stage.The trend coefficient at different growth periods was root elongation stage（-11.5 hrs/10y） maturing stage（-11.3 hrs/10y） vigorous growth stage（-2.6 hrs/10y）.The sunshine durations during tobacco growth period in Sanmenxia were longer than those in Luoyang.Mutation analysis showed that the saltation of sunshine durations at tobacco growth period in western Henan occurred in 1981.