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建立了基于温室环境参数、甜瓜生长发育参数和土壤水分参数的温室甜瓜日蒸腾量估算模型,以研究温室条件下甜瓜蒸腾量的估算方法.根据温室内特定环境对Penman-Monteith方程中空气动力项进行修正,推导出了适于计算温室条件下参考作物蒸腾量的温室环境因子子模型;以甜瓜叶面积指数为自变量构建了作物因子子模型,模型形式为线性函数;以土壤相对有效含水量为自变量构建了土壤水分因子子模型,模型形式为对数函数.采用分期播种法,根据周年不同播期实测数据对模型参数进行估计和分析.采用土壤相对含水量分别为80%、70%、60%的实测蒸腾数据,对模型在充分灌溉和节水灌溉条件下的预测精度进行了检验,模拟值的平均相对误差分别为11.5%、16.2%、16.9%.所建蒸腾模型是对Penman-Monteith公式在温室环境和节水灌溉条件下的有益探索,具有重要推广应用价值.
Based on the greenhouse environmental parameters, the growth and development parameters of muskmelon and soil moisture parameters of greenhouse cucumber daily transpiration estimation model to study greenhouse greenhouse conditions, the estimation of transpiration of melon.According to the specific environment of the greenhouse Penman-Monteith equation aerodynamic terms The sub-model of greenhouse environmental factor suitable for calculating the reference crop transpiration in greenhouse was derived. The sub-model of crop factor was constructed by taking the leaf area index of melon as the independent variable, and the model form was a linear function. The soil relative effective water content A sub-model of soil moisture was constructed for the independent variable and the model was a logarithmic function.The model parameters were estimated and analyzed according to the annual sowing dates by using the seeding sowing method.The soil relative water content was 80%, 70% , 60% of the measured transpiration data, the prediction accuracy of the model under full irrigation and water-saving irrigation conditions were tested, the average relative error of the simulation values were 11.5%, 16.2%, 16.9% respectively.The built transpiration model is Penman -Monteith formula beneficial exploration under greenhouse conditions and water-saving irrigation conditions, has an important promotion and application value.