【摘要】 为研究模拟温度变化对冬、春季石蒜光合作用的影响,利用人工气候箱模拟冬季和春季的温度变化,同时调节叶室温度与环境温度保持一致,测定石蒜光合作用参数。结果表明,与15℃温度条件相比,5℃亚低温条件下,石蒜净光合速率(Pn)下降幅度明显,而初始量子效率(α)明显升高。在不同温度下,光合光响应曲线不同:当环境温度为15℃时,只有当叶室温度等于环境温度时才出现正常曲线,在低光强下出现光饱和点(LSP);当环境温度为5℃、叶室温度高于或低于10℃(5、15、20℃)时,光合光响应曲线正常,随着叶室温度的升高,Pn几乎降至零。更多还原

【Abstract】 To study the effects of simulate temperature change on photosynthesis of Lycoris radiata in winter and spring, the photosynthesis indexes were measured through the artificial climate chest to fix the environmental temperature with the change of cuvette temperature. The results showed that compared with15℃, the photosynthesis of L. radiata was affected by mild hypothermia at 5℃, the net photosynthetic rate(Pn)was much lower than that under 15℃, but the initial quantum efficiency(α) was much higher. Under different temperatures, the photosynthetic light-response curves were different: when the ambient temperature was15℃, the normal curve only appeared when cuvette temperature was equal to ambient temperature, and light saturation point(LSP) appeared at low light intensity; when ambient temperature was 5℃, the photosynthetic light-response process was normal when the cuvette temperature was above or below 10℃(5, 15, 20℃), as the cuvette temperature rose, Pn dropped almost to zero.更多还原