日光温室番茄叶温的模拟及与环境因子的关系

A Simulation Model of the Relationship between Tomato Leaf Temperature and Ambient Factors in Solar Greenhouse

日光温室内温度是温室微气候控制的常用参数,但是植物本身的温度(主要是叶温)影响着植物的生理活动,温室内温度要根据叶温的变化来调控。建立叶温的模拟模型可为日光温室内气温的调控及将能量平衡模型结合到温室环境控制系统中提供理论依据。该研究根据植物叶片能量平衡原理建立了一个以日光温室内环境条件(净辐射、气温、空气相对湿度)为主要驱动变量,以气孔阻力和空气动力学阻力为参数的番茄植株叶温模拟模型,并通过阴天、晴天土壤水分亏缺和土壤水分充足条件下叶温实测数据对模型进行了试验验证。结果表明,阴天、晴天土壤水分亏缺和土壤水分充足条件下番茄植株叶温模拟值与实测值的变化趋势一致。模型很好地模拟了晴天土壤水分充足条件下叶温的变化,其模拟值与实测值的决定系数R2=0.845,模拟方程的斜率k=0.961,截距f=-0.121,估计标准误差RMSE=2.1℃,相对误差RE=9%。

Air temperature is one of the general parameters for microclimate control in solar greenhouse,but plant physiological activities are affected mainly by leaf temperature.It is better to control air temperature based on leaf temperature changes of tomato in solar greenhouse.A simulation model of tomato plant leaf temperature in solar greenhouse was developed based on the principle of plant leaf energy balance.The input of the model mainly includes ambient factors in solar greenhouse（net radiation,air temperature,and relative humidity）,and the parameter of the model involves stomatal resistance and aerodynamics resistance.The model was verified by experimental data of leaf temperature measured on overcast days and on sunny days,under the soil water deficiency and sufficiency,respectively.The results showed that the model well simulated the leaf temperature under sufficient soil moisture on sunny days,with the coefficient of determination between the simultated and the measured being 0.845,the slope of linear regression being 0.961,and intercept being-0.121.