Evaluation of Methods for Estimating Greenhouse Eggplant Daily Evapotranspiration Based on the Values of Weighing Lysimeter Measurements

doi:10.3969/j.issn.1000-6362.2020.03.001

Abstract

Abstract: The daily evapotranspiration of greenhouse eggplant measured by weighing lysimeter was used as the standard value, four kinds of model methods, such as FAO-56 P-M method(P-Ms), modified P-M method(P-Mm), Priestley-Taylor method(P-T) and Irmak-Allen method(I-A) were applied to comparatively and analyze the daily evapotranspiration of greenhouse eggplant, and the applicability of each method in greenhouse was also evaluated. The results showed that the daily evapotranspiration of greenhouse eggplant that calculated by the four model methods had a similar variation rule with the measured value(ETc). However, the calculation accuracy of each method was obviously different. The ETc-m that calculated by P-Mm method was overestimated by 32.1mm, while the ETc-s, ETc-PT and ETc-IA that calculated by P-Ms, P-T and I-A methods were underestimated by 132.3mm, 80.0mm and 53.5mm, respectively. ETc-m is much more correlated with ETc than others, and the equation coefficient R2 was 0.905(P<0.01), the consistency index was 0.944, and RMSE was only 0.769mm·d-1. The correlation of ETc-IA with ETc was better than ETc-s and ETc-PT, and the equation coefficient R2 was 0.775(P<0.01), the consistency index was 0.828. Large errors were observed when methods P-Ms and P-T were applied in greenhouse, and the ETc-s and ETc-PT were only 59.4% and 74.8% of the measured value (ETc). Meanwhile, the consistency indexes were only 0.723 and 0.748, respectively, and RMSE were 1.672mm·d-1 and 1.304mm·d-1, respectively. Therefore, the P-Mm method could be preferred to calculate the evapotranspiration of greenhouse crops, while I-A method is an alternative method in greenhouse in the case of insufficient meteorological data.

Key words: Weighing lysimeter, Greenhouse eggplant, Daily evapotranspiration, Environmental factors, Estimation methods

CLC Number:

LI Yin-kun，GUO Wen-zhong，HAN Xue，WANG LI-chun，LIN Sen，ZHAO Qain，CHEN Hong. Evaluation of Methods for Estimating Greenhouse Eggplant Daily Evapotranspiration Based on the Values of Weighing Lysimeter Measurements[J]. Chinese Journal of Agrometeorology, 2020, 41(03): 129-137.

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