冬季负积温变化特征及其对冬小麦的影响

Impact of Negative Accumulated Temperature Variation on Winter Wheat

利用唐山地区11个气象站1961～2005年冬季日平均气温资料，应用统计万医灯居山地匹冬竿贝伏跹笠忆规律进行分析研究，得出以下结论：①唐山地区冬季负积温空间分布为北多、南次之、中部最少。②冬季负积温的年际变化呈现3个时段，20世纪60年中期到70年代初为冷冬时段，70年代中期到80年代末为冷冬与暖冬交替出现的过渡时段，90年代后至今为暖冬时段。③冬季变暖趋势北部最明显，南部次之，中部最不明显。针对冬季负积温变化特征，提出了对冬小麦生长的潜在影响。

The winter negative accumulated temperatures of all stations are statistically calculated based on the average daily air temperature of 11 meteorological observation stations in Tangshan from 1961 to 2005, and the spatial variations are analyzed. The results show： （1） The spatial distribution of the winter negative accumulated temperature in Tangshan decreased from northwest to southeast. （2） The interannual variation of winter negative accumulated temperature can be denoted in three periods of time： cold winters from the middle 1960s to the early 1970s; the transitional period of alternate cold and worm winters from the middle 1970s to the late 1980s; worm winters in the 1990s. （3） There existed a variation trend of winter warming： ＂North 〉 South 〉 central part. ＂ The potential impacts of these variation features are discussed.