Estimation Methods of Paddy Field Evapotranspiration and Analysis of Irrigation Impact
MA Meijuan
JING Yuanshu
LEILA Cudemus
LI Qian
Abstract：Evapotranspiration plays an important role in water cycle and water balance system.[Objective]Find the suitable evapotranspiration model and sensitive factors.[Method]According to the net radiation, soil heat flux and microclimate data of the experimental area in Yujiang county of Jiangxi province, we analyzed fitting re-sults of the different evapotranspiration models of time scales, the sensitivity analysis of evapotranspiration to weather elements, and the irrigation effects on potential evapotranspiration.[Result]The results showed that the fitting result of Penman-Monteith was the best, and the next was Priestley-Taylor. The result for Hargreaves was bad and it underestimated the actual evapotranspiration on the daily scale. On the hourly scale, the fitting efficien-cy of Penman-Monteith and Priestley-Taylor model was better. Evapotranspiration had different sensitivities to meteorological factors on different time scales, and evapotranspiration was more sensitive to net radiation and va-por pressure.[Conclusion]In different irrigation treatments, the potential evapotranspiration of Penman-Monte-ith model has a significant change, which of Priestley-Taylor model has no obvious change.
Keywords：paddy fieldsevapotranspiration modeltime scalesirrigation
Publication Date：2018-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 82-88 )