It is a very important part for crop transpiration in the process of crop growth. For seeking suitable transpiration estimating model of tomato grown in greenhouse, the parameters such as canopy stomatal resistance of tomato and aerodynamic resistance were modified in connection with a microclimate environment in greenhouse based on Penman-Monteith equation, and the estimation model of transpiration for greenhouse-grown tomato was established by considering the meteorological data, leaf area index and canopy height as main parameters. The model was verified by measurement values of sap flow rate from May 2 to 13 in 2009 (at the flowering and fruit development stage) and from June 9 to 20 in 2009 (at the fruit maturation stage), respectively. The result showed that average relative error for the model simulation was 8.48% and 9.20% at two stages, respectively. Therefore, plant transpiration could be estimated using the model. The transpiration model established in this study could provide important reference value to further research on tomato-water relationship in greenhouse.%为寻求适合于温室栽培条件下番茄植株蒸腾量的计算模型,该文以Penman-Monteith方程为基础,针对日光温室特定的小气候环境,对番茄冠层整体气孔阻力、空气动力学阻力等参数进行了修正,建立了包含气象数据、番茄叶面积指数和冠层高度为主要参数的日光温室番茄蒸腾最估算模型.分别采用2009-05-02-2009-05-13(开花坐果期)和2009-06-09- 2009-06-20(成熟采摘期)2个时段内的实测蒸腾量对模型模拟结果进行验证,2个时段内模型模拟结果的平均相对误差分别为8.48％和9.20％,表明所建模型可以较好地计算日光温室番茄的蒸腾量.该研究提出的蒸腾量估算模型对日光温室番茄需水规律的深入研究具有参考价值.
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