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基于修正后的Penman-Monteith方程,通过分析作物系数与积温的关系,构建了基于常规气象资料的滴灌条件下温室番茄需水量估算模型,并分别采用2009年5月2—13日(开花坐果期)和6月9—20日(成熟采摘期)2个时段内的实测蒸腾量和实测棵间土壤蒸发量对模型模拟结果进行验证.结果表明:修正后的Penman-Monteith方程适用于温室参考作物需水量(ET0)的计算;温室番茄作物系数与积温呈抛物线关系;所建需水量模型模拟值的平均相对误差小于10%,可用于估算滴灌条件下温室番茄需水量.
Based on the modified Penman-Monteith equation, an estimation model of water requirement of greenhouse tomato under drip irrigation based on conventional meteorological data was established by analyzing the relationship between crop coefficient and accumulated temperature. The water consumption of greenhouse tomato was estimated by using the data of May 2-12, 2009 ) And June 9-20 (ripening period) in two periods of actual measured transpiration and measured inter-soil evaporation to verify the results of the model.The results show that: the modified Penman-Monteith equation is suitable for greenhouse reference crops Water requirement (ET0). The correlation between crop coefficient and accumulated temperature in greenhouse was parabolic. The average relative error of simulated value of the model was less than 10%, which could be used to estimate the water requirement of greenhouse tomato under drip irrigation.