关键词: 黄土高原, 终霜冻, 冬小麦发育期, 气候变化, 响应

Abstract: The response of spring temperature,last frost and winter wheat growth to climate warming was analyzed based on meteorological data and fields experiment data in Xifeng station Gansu province.The results showed that the average spring temperature increased at the rate of 1.2℃/10y,average spring minimum temperature increased at the rate of 1.1℃/10y,and extreme minimum temperature in May increased at the rate of 1.2℃/10y from 1981.The extreme minimum temperature in April has changed in fluctuation since 1997,the extreme minimum occurred in 2001 and 2006.The date of last frost advanced at the rate of 3.2d/10y,and surface minimum temperature changed in fluctuation.The jointing date of winter wheat advanced at the rate of 4.5d/10y from 1981(P<0.01)and more early from 1997.The jointing date advancing rate of winter wheat was greater than that of last frost,which indicated that winter wheat could faced more freezing risk during jointing to booting stage in spring.

Key words: Loess Plateau, Last frost, Growth period of winter wheat, Climate change, Response