连翘光合作用特性及其影响因子分析

Photosynthetic Characteristics of Forsythia suspensa and Influencing Factors

以7a生连翘为试材,对其光合作用日变化和光响应曲线进行测试,并对影响其光合作用的生理因子和环境因子进行了相关性分析。结果表明:连翘净光合速率、气孔导度和蒸腾速率的日变化均呈单峰曲线,净光合速率的峰值出现在12:00,对光环境的适应性较强;光补偿点为51.49μmol·m^(-2)·s^(-1),显示了阳性植物的光合特性;日平均光合速率为9.9μmol·m^(-2)·s^(-1),表现出较强的光合作用能力。连翘净光合速率与光合有效辐射、气孔导度、蒸腾速率呈显著的正相关关系,与胞间CO_2浓度呈显著的负相关关系,而与外界CO_2浓度、空气温度和相对湿度无显著的相关性。

7-year-old Forsythia suspensa was used as material to investigate its diurnal photosynthetic variation and light response curve. Correlation analysis on physiological and environmental factors demonstrated that diurnal net photosynthetic rate （NPR）, stomatal conductance and transpiration rate showed a single peak curve pattern with no pronounced decline at noon. A peak value of NPR occurred at 12.00. The light compensation points topped to 51.49 umol·m-2 ·s-1 with 9.9 umol · m-2 · s-1 of mean diurnal Pn. Net photosynthetic rate had significantly positive correlation with PAR, Gs and Tr, while negative with Ci, and no significant with Ca, Ta and RH.