电导率对温室黄瓜叶面积和干物质生产影响的动态模拟
cucumber under different electrical conductivity
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摘要: 电导率是温室营养液管理的重要参数。为定量研究不同电导率对温室黄瓜光合与干物质生产的影响，该文以温室黄瓜为试验材料，于2009年10月至2010年7月进行了不同电导率的营养液栽培的试验，定量分析了电导率对温室黄瓜叶面积、光合速率和干物质生产的影响，构建了以辐热积为尺度的叶面积指数、最大光合速率和干物质生产模型，并用独立的试验数据对模型进行了检验。结果表明：模型对温室黄瓜叶面积、最大光合速率和干物质产量的模拟值与实测值之间的决定系数分别为0.89、0.93和0.94，回归估计标准误差分别为0.21?m2/m2、1.52?μmol/(m2·s)和36.77?kg/hm2，预测相对误差分别为4.5%、11%和9.2%。该研究建立的模型可以为温室黄瓜的营养液管理和决策提供依据。Abstract: Electrical conductivity (EC) is an important parameter of nutrient solution management. In order to investigate the effects of EC on photosynthesis rate and dry matter production of greenhouse cucumber, experiment of greenhouse cucumber with different EC was conducted in greenhouse of Jiangsu University from September 2009 to July 2010. Effect of different EC on leaf area, maximum photosynthesis rate and dry matter production were quantitative analyzed. A simulation model based on thermal and photosynthetically active radiation was founded. Independent experimental data were used to validate the model. The results showed that the coefficient of determination between simulated and measured values of leaf area index, maximum photosynthesis rate and dry matter production based on the 1:1 line were 0.89, 0.93 and 0.94, respectively. And root mean squared error between the simulated and measured values were 0.21 m2/m2, 1.52μmol/(m2·s) and 36.77 kg/hm2, respectively. Relative error between the simulated and measured values were 4.5%、11% and 9.2%, respectively. The model could be used for optimizing nutrient solution management for greenhouse cucumber.
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Keywords:
- electric conductivity /
- photosynthesis /
- dynamics /
- greenhouses /
- leaf area index /
- dry matter production
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