光照和温度对飞机草种子萌发的影响

Effects of light and temperature on seed germination of Eupatorium odoratum

关键词:  飞机草  种子萌发  光照  温度

摘要:

通过在人工培养箱内模拟环境条件，探讨了不同光照和变温对飞机草种子萌发的影响。结果表明：在有光照状况下，飞机草种子在15℃/10℃～40℃/35℃条件下均能萌发，飞机草种子萌发的最适变温为30℃/25℃，萌发率达47.5%；而黑暗条件下，飞机草种子在15℃/10℃时不能萌发；在20℃/15℃～35℃/30℃范围内，温度越高，飞机草种子萌发高峰的出现时间越早；在15℃/10℃～30℃/25℃范围内，飞机草种子的萌发率随温度的升高而升高，超过30℃/25℃后，萌发率下降，而适当的光照有利于飞机草种子的萌发。飞机草成为入侵种并迅速扩散与其种子萌发对光照和温度的适应性密切相关。

Abstract:

The effects of different light and changing temperature conditions on seed germination of Eupatorium odoratum  were studied by simulating environmental conditions in climatic chambers. The results was as followed:the seed of E.odoratum could germinate from 15℃/10℃ to 40℃/35℃ under light，and the optimum changing temperature was 30℃/25℃. Under this changing temperature，the germination rate was 47.5%；at 15℃/10℃，the seed of E.odoratum couldn't germinate under dakness；from 20℃/15℃ to 35℃/30℃ temperature conditions，the higher temperature，the seed germination peak appeared earlier；from 15℃/10℃ to 30℃/25℃ temperature conditions，the seed germination rate of E.odoratum increased with increasing temperature，and higher than 30℃/25℃，the germination rate reduced. Appropriate light was more conducive to seed germination of E.odoratum. E.odoratum became invasive species and proliferated speedily could be closely related with seed germination adaptability to light and temperature.