温室逐时参考作物腾发量的估算

Estimation of Hourly Reference Crop Evapotranspiration in Greenhouse

为建立适合逐时计算温室ET0的模型,基于自然气象条件下的逐时Penman-Monteith(PM)公式,对其空气动力项进行修正得到了温室条件下的修正PM公式。并对比了修正PM公式与PM公式计算得到的温室逐时ET0。结果表明,修正PM公式与PM公式计算的温室逐时ET0年内变化趋势基本相同,但修正PM公式得出的逐时ET0负值较少,稳定性较高。修正PM公式计算的逐时ET0与时平均气温、时最高气温、时最低气温及时平均相对湿度有极好的相关性。

In order to establish an apllicable hourly ETo calculation model in greenhouse, aerodynamic re- sistance was modified based on hourly Penman-Monteith （PM） equation in the natural weather conditions, and then the modified hourly PM equation was obtained . Hourly ETo calculated by the modified hourly PM equation and PM equation was compared. The results showed that： the yearly trend of hourly ETo cal- culated by modified PM equation under the greenhouse condition was generally similar with that calculated by PM equation, but the negative values of hourly ETo calculated by the modified PM equation were less than those obtained by PM equation. The modified hourly PM equation was more stable than the former one. Hourly ETo calculated by the modified PM equation was highly correlated with maximal air tempera- ture, minimum air temperature, average air temperature, and average relative humidity at hourly scale.