北京地区光温因子对不同秋眠等级苜蓿秋后再生的影响

Effects of solar light and temperature on fall dormancy of alfalfa in Beijing area

通过对11个美国标准秋眠等级苜蓿Medicago sativa再生高度的测定,研究了北京地区苜蓿秋季再生高度与日照时间和平均温度的关系。结果表明:在北京地区,苜蓿秋眠性表现时间在10月份;光周期和平均温度对苜蓿秋眠性影响较大,不同秋眠类型苜蓿分化的临界条件是秋季日长小于11 h,平均温度低于10.4℃;不同秋眠等级发生分化的临界条件是秋季日长低于10 h,平均温度低于7.8℃。

The regrowth height of 11 alfalfa varieties with different fall dormancy rates were measured in order to find out the relationships of regrowth height with sunshine time and average temperature. The results showed that the fall dormancy of alfalfa appeared in October in Beijing. Photoperiod and average temperature showed impacts on the fall dormancy of alfalfa. The critical threshold conditions of different fall dormancy types were that the sunshine time was less than 11h and the average temper- ature was less than 7.8℃. The critical threshold conditions of different fall dormancy rates were that the sunshine time was less than 10.4 h and the average temperature was less than 7.8℃.