不同土壤水分条件下信阳五月鲜桃光响应过程及其模拟

Light Response Process and Its Simulation of Xinyang May Peach Under Different Soil Moisture Conditions

为探明不同土壤水分条件下信阳五月鲜桃光响应变化规律,以3年生盆栽幼树为试材,分别采用直角双曲线模型、非直角双曲线模型、指数模型、直角双曲线修正模型对不同土壤水分(SWC80,60,40,20)处理下的信阳五月鲜桃光响应曲线进行拟合。结果表明:①在不同土壤水分条件下信阳五月鲜桃的Φ值在0.02~0.05之间,在弱光下光能利用效率随着土壤水分含量的升高而增强。②信阳五月鲜桃不同土壤水分条件下光饱和点变化范围256~670μmol/(m^2·s)。充足的土壤水分能够缓解信阳五月鲜桃的光抑制现象;高土壤水分状况和低土壤水分状况下光补偿点降低,对弱光的利用能力增强。③直角双曲线修正模型对信阳五月鲜桃的拟合效果最佳。

In order to explore the light response change law of Xinyang May peach under different soil moisture condition,3-years-old potted saplings were used as experiments material,four light response models,including right-angle hyperbolic model,non-orthogonal hyperbolic model,exponential model and right-angle hyperbolic correction model,were adopted to fit the light response curves of Xinyang May peach under different soil moisture(SWC was 80%,60%,40%and 20%,respectively).The main results were as follows:①The apparent quantum efficiency value of Xinyang May peach was between 0.02 and 0.05 under different soil moisture conditions,the utilization efficiency of light energy under low light increased with the increase of soil moisture.②The range of light saturation point of Xinyang May peach was 256~670μmol/(m^2·s)under different soil moisture conditions.Adequate soil moisture could alleviate the light inhibition of Xinyang May peach.The light compensation point was reduced and the utilization of weak light was enhanced under higher and lower soil moisture conditions.③The right-angle hyperbolic correction model had the best effect on Xinyang May peach.