基于棚内气象数据的冬季大棚番茄蒸腾计算

彭曼-蒙特斯方程(P-M方程)在大棚温室的实际应用中存在的困难是气孔阻力rc和边界层空气动力学阻力ra的测量和计算.根据空气动力学方程和能量平衡方程,提出了冬季大棚温室作物叶-气系统中叶片层流边界层阻力rb、冠层上方湍流边界层阻力rg、空气动力学阻力ra和叶片气孔阻力rc的计算公式,并结合棚内实测数据计算了rc和ra的特征值(75 s/m和96 s/m).利用P-M方程模拟计算了冬季大棚番茄作物蒸腾速率,并与实测值进行比较,结果表明,冬季大棚番茄作物日蒸腾速率的实测值和模拟值基本一致.

Calculation of greenhouse tomato transpiration based on indoor meteorological data in winter

The difficulties for the application of Penman-Monteith equation in the greenhouse are the measurement and calculation of canopy resistance rc and boundary layer resistance ra. The calculation method of rc and ra was introduced according to the aerodynamics and energy equations; and the mean values of rc and rc(75 s/m and 96 s/m) were calculated based on experimental measurements made in the greenhouse in winter. The Penman-Monteith equation was used to calculate canopy transpiration rates of tomato in winter. The results show that the crop canopy transpiration rate of tomato calculated by Penman-Monteith equation agreed well with the measured results.