摘要
为探讨不同光响应曲线模型对烟草的适用性,分别测定云南赵桅基地K326叶片在20、30和35℃下的净光合速率光响应曲线,昭通自然条件下红花大金元(红大)、KRK26和云烟99叶片净光合速率的光响应曲线。用直角双曲线模型、非直角双曲线模型、动力学模型、指数模型以及叶子飘等构建的新光响应模型(新模型)对各光响应曲线进行拟合。结果表明,新模型对光饱和、非光饱和及光抑制的光响应曲线拟合均较好,指数模型对光饱和的光响应曲线拟合较好,其它3个模型对任何一种光响应的拟合效果均较差。指数模型和新模型拟合的最大净光合速率(Pmax)与实测值最接近,其它3个模型拟合的Pmax值偏高,以非直角双曲线模型偏高最明显。直角双曲线模型和非直角双曲线模型拟合的表观量子效率(α)普遍接近或超过最大量子效率理论值范围,指数模型和新模型拟合的α值在正常范围内,动力学模型拟合的α值则偏低。非直角双曲线模型拟合的光补偿点(Ic)明显低于实测值,其它模型拟合的Ic与实测值均较接近。直角双曲线模型、非直角双曲线模型和动力学模型不能直接计算光饱和点(Is),新模型拟合的Is与实测值均接近,出现光饱和及光抑制时,指数模型拟合的Is也与实测值接近。研究结果表明,以新模型对烟草光响应曲线进行拟合较为合理。
In order to reveal applicability of different photosynthetic light-response models for tobacco, the light response curves of net photosynthetic rates of K326, which treated with 20℃, 30℃ and 35℃ in Zhaowei base in Yuxi, and Honghuadajinyuan （Hongda）, KRK26 and Yunyan99, which in natural conditions in Zhaotong, were determined respectively. The photosynthetic light -response curves were simulated by rectangular hyperbolae model, non-rectangular hyperbolae model, exponential model, kinetics model and a new model. The results showed that the new model simulated well to light - response curves of light saturation, non-light saturation and light inhibition, exponential model simulated well to light saturated response curve, and other three models could not simulated to any light - response curves. The maximum net photosynthetic rates （ Pmax ） of exponential model and new model were closed
出处
《中国农业气象》
CSCD
北大核心
2013年第1期74-80,共7页
Chinese Journal of Agrometeorology
基金
国家科技部公益性行业科研专项(GYHY200906021)
云南省烟草昭通市公司项目(2010YN24)
关键词
光合作用
光响应模型
烟草
适用性
Photosynthesis
Light response model
Tobacco
Applicability
