灌溉排水学报2024，Vol.43Issue(4)：9-14,6.DOI:10.13522/j.cnki.ggps.2023399
基于单作物系数法的温室秋季生菜蒸散量估算及验证
Estimation and verification of autumn lettuce evapotranspiration in greenhouse based on single crop coefficient method
摘要
Abstract
[Objective]The variation in evapotranspiration is an important parameter in irrigation design.In this paper,we propose and verify a modified single crop coefficient method to calculate the evapotranspiration of greenhouse lettuce.[Method]The experiment was conducted in autumn from 2021 to 2022 in a greenhouse grown with lettuce.The crop coefficient was calculated using the formula recommended by FAO-56,with the calculated crop coefficient for initial growth stage being modified based on ET0 and irrigation frequency,while for other growing stages it was modified based on meteorological factors and plant height.The modified single crop coefficient was then used to calculate the evapotranspiration of the lettuce,with the calculated results being validated against measured data from weighing lysimeters.[Result]The mean reference crop evapotranspiration(ET0)of the lettuce varied between 1.18 to 2.44 mm/d,but showed a decreasing trend from 2021 to 2022.The modified crop coefficient and measured crop coefficient both peaked at the initial stage,with their associated two-year average being 0.74±0.13 and 0.76±0.13,respectively.As the crop grew,both crop coefficients asymptotically decreased to 0.5～0.6 in the middle and later growing stages.The modified crop coefficient was closer to the measured crop coefficient than that calculated from the formula recommended by the FAO-56,with the relative error between them ranging from-6.7%to 5.4%.The mean estimated and the measured evapotranspiration of the lettuce in autumn were 1.310 mm/d and 1.283 mm/d,respectively.The determination coefficient,the mean absolute error,root mean square error and the index of the agreement between the measured and estimated evapotranspiration were 0.975,0.176 mm/d,0.222 mm/d and 0.955,respectively.[Conclusion]The modified single crop coefficient is more accurate than that calculated from the formula recommended by the FAO-56 for estimating the evapotranspiration of greenhouse lettuce.关键词
温室生菜/单作物系数/蒸散量/参考作物蒸散量/称重式蒸渗仪Key words
greenhouse lettuce/single crop coefficient/evapotranspiration/reference crop evapotranspiration/weighing lysimeter分类
农业科技引用本文复制引用
武佳乐,李银坤,张钟莉莉,刘美英,刘胜尧,贾丽娟..基于单作物系数法的温室秋季生菜蒸散量估算及验证[J].灌溉排水学报,2024,43(4):9-14,6.基金项目
国家重点研发计划(2022YFD1900404-02) （2022YFD1900404-02）
河北省重点研发计划项目(21326904D) （21326904D）
河北省现代农业产业技术体系(HBCT2023100214) （HBCT2023100214）
