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采用田间开放式夜间增温试验方法,研究雨养农区寒地春玉米生长发育及产量对花前夜间增温的响应.结果表明:夜间增温条件下,0～10cm耕层土壤夜间温度升高1.7℃,土壤水分略有下降;夜间增温使春玉米物候期明显提前,花前生育期缩短1d,花后生育期延长1d;夜间增温明显促进春玉米幼苗生长,提高根系长度,单株绿叶面积和棒三叶面积分别比对照提高13.5%和14.6%;与对照相比,春玉米地上生物量和籽粒产量分别显著增高8.2%和9.3%,百粒重显著增高7.1%.东北地区气候变暖尤其是日最低温度升高对春玉米的直接影响效应可能以增产为主.
The field night-time night temperature increase test was used to study the response of spring maize growth and yield to the night-time night-time temperature increase in rainfed areas. The results showed that night night temperature rise of 0-10 cm soil layer High 1.7 ℃, soil moisture decreased slightly; night warming so that the spring corn phenophase was significantly ahead of the pre-anthesis shortened 1d, the growth period after anthesis prolonged 1d; night warming significantly promote the growth of spring corn seedlings to improve root length, single Compared with the control, the aboveground biomass and grain yield of spring maize increased by 8.2% and 9.3%, and the grain weight increased significantly by 7.1% .Compared with the control, the area of green leaves and cloverleaf increased by 13.5% and 14.6% The direct impact of climate warming, especially the lowest daily temperature on spring maize, may be mainly yield increase.