基于辐热积的温室微灌基质栽培生菜生长模拟

A simulation for lettuce growth and development in greenhouse based on product of thermal effectiveness and photosynthetically active radiation

为探明不同栽培方式对生菜生长的影响,采用滴灌、微喷灌2种灌溉方式和醋糟与草炭复配而成的4种栽培基质,根据生菜对温度和有效光合辐射的响应,以光温因子-辐热积(TEP)为驱动变量,建立不同灌溉方式和不同基质配方条件下的温室基质栽培生菜营养生长模拟模型,模型包括单株生菜叶面积模型、干物质累积模型和单株生菜产量模型。结果显示,不同灌溉方式下可用同一个模拟模型,相同灌溉方式下,不同基质栽培生菜特征值差异不显著(P>0.05),可用同一组模型参数来表示。运用重复试验对所建模型进行验证,滴灌和微喷灌条件下各基质处理的生菜叶面积、干物质和产量预测值与实际值之间的决定系数(R2)均大于0.94,RMSE最大分别为71.6cm2、0.32 g、10.67 g,表明所建立的生菜营养生长模拟模型具有较高的预测精度,可为温室基质栽培生菜产量预测提供理论依据。

To find out the effect of cultivation methods on vegetable growth and development, the lettuce leaf area, dry matter production and fresh production were studied in four substrates under drip and mico-sprinkler irrigation. Based on the experimental data of the lettuce and the product of thermal effectiveness and PAR to establish the simulation models of leaf area, dry matter production and fresh production. The result indicated that lettuce characters in different substrates were no significantly different （ P〉0. 05） under the same irrigation method. These data of repeat test were employed to veri-fy the establishing models. The maximum root mean square error between simulated and observed values of lettuce leaf are-a, dry matter production and fresh production under drip and mico-sprinkler irrigation were 71. 6 cm2 , 0. 32 g and 10. 67 g, respectively.