金银花净光合速率日变化及其对光合有效辐射响应的数学模型

目的]为生产实践提供理论依据。方法]以金银花为材料，采用便携式光合测定系统，研究其净光合速率日变化及其对光合有效辐射响应的数学模型。结果]与多数其他G3植物一样，金银花净光合速率日变化曲线呈双峰型，但在具体达到峰值的时间上与前人的结果有差异；金银花净光合速率对光合有效辐射的响应可用对数、线性、二项式3种数学函数来描述，但以二项式描述更确切；根据前面得到的二项式方程，计算出了金银花的光饱和点为1086．3μmol／（m^2·s）。结论]金银花净光合速率日变化曲线呈双峰型，其净光合速率对光合有效辐射的响应以二项式描述较准确。‘

Diurnal Changes of Net Photosynthetic Rate (NPR) in Leaves of Lonicera japonica Thunb. and the Responding Mathematical Model of NPR to Photosynthetic Valid Radiation

Objective] The study provided theoretical basis for production practice.Method] With Lonicera japonica Thunb.as material,diurnal changes of net photosynthetic rate(NPR) in leaves of the plant and the responding mathematical model of NPR to photosynthetic valid radiation were studied using portable photosynthetic determinator system.Result]Like most of C3 plants,the diurnal changes curve of NPR of Lonicera japonica Thunb.showed double peaks,but there were time difference in reaching the peak value between the study and previous ones.The responding mathematical model of NPR to photosynthetic valid radiation could be described by three mathematic functions,such as logarithm,linearity and binomial,but binomial function was more precise than the others.Light saturation point of Lonicera japonica Thunb.was figured out by binomial equation deduced in the study,and light saturation point was 1 086.3 μmol/(m2·s).Conclusion] The diurnal changes curve of NPR of Lonicera japonica Thunb.showed double peaks,and the responding mathematical model of NPR to photosynthetic valid radiation could be described by binomial functions.