Abstract: Based on the 1987-2004 observation data obtained from Minxian agricultural meteorological station in Gansu Province, this paper studied the effects of climate warming on the spring wheat growth and yield in rain-fed agriculture area of high-altitude, cold, and dankness region. The results showed that in last 18 years, the temperature in this region increased but precipitation decreased. Furthermore, the magnitude and rate of temperature increase were far more than those of the average in last 50 years over China. Under the climate warming, the growth period of spring wheat shortened, and its yield increased.Spring wheat had different responses to the climate warming at its different growth stages, and so did the responses of its yield and yield components. The temperature increase at flowering-milking stage had a significant relationship (P<0.01) with spring wheat yield, and the temperature increase at sprouting-jointing and flowing-maturity stages and the temperature decrease at jointing-booting stage induced the increase of grain numbers per spike and the decrease of sterility spike rate, resulting in an increased yield at last. Each 1 ℃ increase in daily mean temperature during spring wheat development could shorten the whole growth period by 9.2 days and increase the yield by 26.2%. It was predicted that future climate warming would further affect spring wheat growth and yield.

Key words: Poplar, Salinity stress, Growth, Enzyme activity