陇东塬区冬小麦适宜播种期分析

通过对西峰农业气象试验站1981-2005年冬小麦观测资料和西峰国家基准气象站近35年来气象观测资料的详细分析,总体来看,气候变暖使陇东塬区冬小麦生育期发生显著变化,主要表现为冬前发育期推迟,生育期天数延长,春季发育期提前,生育期天数缩短。冬前旺长现象严重,春季易受晚霜冻和干旱危害,对冬小麦生产影响严重。气候变化对冬小麦播种出苗影响较大,当冬小麦播种期推迟8～10 d后,能有效控制冬前旺长现象的出现,避免和减轻春旱对冬小麦生产的危害。

Analysis on Suitable Sowing Period of Winter Wheat in the Loess Tablelands in East Gansu Province

In this paper,the data of winter wheat observed by Xifeng Agrometeorological Experimentation Station and some meteorological data observed by Xifeng State Meteorological Station during the period of 1981-2005 are analyzed.The results reveal that the temperature in the study area has significantly increased since recent 35 years, especially in winter and spring,but the precipitation was obviously decreased after the 1980s but has increased since the 1990s.The growth season of winter wheat in the loess tablel...