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| DOI：10.13522/j.cnki.ggps.2017.0325 |
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| Estimation Methods of Paddy Field Evapotranspiration and Analysis of Irrigation Impact |
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MA Meijuan, JING Yuanshu , LEILA Cudemus , LI Qian
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Collaborative Innovation Center of Meteorological Disaster Forecasting Warning and Assessment/ Key Laboratory of Agricultural Meteorology in Jiangsu, Nanjing 210044, China; College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
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| 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 results 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 efficiency 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 vapor pressure. 【Conclusion】 In different irrigation treatments, the potential evapotranspiration of Penman-Monteith model has a significant change, which of Priestley-Taylor model has no obvious change. |
| Key words: paddy fields; evapotranspiration model; time scales; irrigation |
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