温室番茄营养生长期叶片蒸腾速率的模拟模型研究

建立节水条件下作物叶片的蒸腾速率模拟模型将为温室作物节水灌溉提供理论依据。本研究以温室盆栽番茄营养生长期叶片为研究对象,在温室内进行了不同定植期和水分处理试验。以光合速率光响应曲线模拟值为基础,建立了不同水分条件下的气孔导度模型以及基于气孔导度模型的Penman-Monteith叶片蒸腾速率模型,并采用不同播期试验下的试验数据对建立的模型进行检验。结果表明,气孔导度模型模拟番茄叶片气孔导度的均方根误差(RMSE)和相对回归估计标准误差(rRMSE)分别为0.0109mol/(m2·s)(H2O)和12.83%,叶片蒸腾速率模型的RMSE和rRMSE分别为0.18mmol/(m2·s)(H2O)和15.55%。建立的番茄叶片蒸腾速率模型实现了通过基本温室气象参数和土壤水分参数模拟叶片蒸腾速率,模拟精度较高,参数便于获取,是对短时间尺度蒸腾速率模拟研究的有益探索,具有一定的理论意义和良好的应用前景。

Study on theSimulation Model for Leaves Transpiration Rate of Greenhouse Tomato in Its Vegetative Growth Period

Accurate simulation of leaves transpiration rate under greenhouse environment is critical for improving crop water use efficiency.According to the experimental data of different sowing dates,a stomatal conductance model was developed using the parameters of light response curve.Subtituting stomatal conductance in Penman-Monteith equation,a transpiration model was established.The proposed model was verified by the independent data.The root mean square error(RMSE)and relative root mean square error(rRMSE)were 0.0109 mol/(m²·s)H₂O and 12.83% for stomatal conductance model,0.18 mmol/(m²·s)H₂O and 15.55% for transpiration model.The proposed model had satisfactory performance with only meteorological and soil moisture data,suggesting a general applicability for calculating crop transpiration under greenhouse environment.