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關鍵詞: 海拔, 氣候變暖, 春小麥, 生長期, 產量, altitude, climate warming, spring wheat, growth period, annual yield

Abstract: Impact of climate warming on the growth and yields of spring wheat at high and low altitudes in the Qinghai Plateau was studied by using the observation data obtained at Minhe and Nuomuhong agricultural meteorological stations from 1980 to 2007. The results show that during the past 28 years the air temperature had an increase trend both at high and low altitudes, and the warming amplitude of annual air temperature was larger at high altitude than at low altitude. Responses of spring wheat at low altitude were an advanced sowing time, an unchanged mature stage, an extended growth period, and a declined yield, and at high altitude the responses were a postponed sowing time, an advanced mature stage, a shortened growth period, and an unstable yield with a larger fluctuation. The growth period of spring wheat was shortened by 11.7 d at high altitude and no significant change at low altitude when daily average temperature increased 1℃ in the growth period of spring wheat. Tillering stage was the turning point of growing period changes of spring wheat between the two places and also a “buffer” of the environment and crop population.