Abstract: Temperatures from early March to early July in 1961-2004, at 10 stations in the Yellow River irrigation region of Ningxia were analyzed. The results show that the temperature during the growing season of spring wheat increased obviously. The t-test indicates that the temperature abrupt change occurred in 1989 with a rise of 0.7℃. Over various phenological stages of spring wheat, the temperature increased, but it didn't exceed the suitable range. The temperature-sensitive index of spring wheat was positive from middle March to early April and from May to early June, therefore the climate warming over these periods was favorable to wheat growth. The temperature-sensitive index was negative from middle June to early July and from middle to late April, thus the climate warming over these periods was unfavorable to wheat growth. Overally, the contribution of climate warming to wheat yield was -2.6%.

Key words: Yellow River irrigation region, Ningxia, climate warming, spring wheat