Chinese Journal of Agrometeorology ›› 2020, Vol. 41 ›› Issue (04): 201-210.doi: 10.3969/j.issn.1000-6362.2020.04.002

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 Simulation of Evapotranspiration for Paddy Rice in Low Hilly Red Soil Region Base

 WEN Jian-chuan, JING Yuan-shu, HAN Li-juan   

  1.  1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster/College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;2.China National Meteorological Centre, Beijing 100081
  • Online:2020-04-20 Published:2020-04-17
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Abstract:  Fully understanding the evapotranspiration of paddy field was conducive to making a reasonable irrigation plan and improving the water use efficiency of paddy field. Therefore, the purpose of discussing the applicability of evapotranspiration estimation model in paddy field of low hilly red soil area was to select the actual evapotranspiration model which was more suitable for paddy field of study area and estimate the evapotranspiration accurately. Based on the measured values of the Bowen ratio system and microclimate data of the paddy field in the low hilly red soil region, eight combined forms of Jarvis formula and Irmak formula were applied to Penman-Monteith model, and nine types of evapotranspiration models were obtained. Firstly, the key parameters in the nine models were calibrated with the measured data in 2014, the hourly ET during the full growth stages in 2015 calculated by the nine model was compared to the observed ET with the Bowen ratio system. In the PM_Jarvis model with eight combined forms, the range of certainty coefficient was 0.823?0.894, the range of consistency index was 0.769?0.865, the nash efficiency coefficient was 0.807?0.903, the range of root mean square error and mean absolute error were 0.084?0.110 mm·h-1 and 0.054?0.070 mm·h-1, respectively. In the PM_Irmak model, the certainty coefficient was 0.940, the consistency index was 0.953, the nash efficiency coefficient was 0.922, the root mean square error and mean absolute error were 0.064mm·h-1and 0.049mm·h-1, respectively. These statistical parameters indicated that predicting hourly ET with the PM_Irmak model performed better than the PM_Jarvis. The diurnal dynamic values of ET simulated by eight PM_Jarvis models were significantly lower than the measured values in regreening stage of rice, the performance of the PM_Irmak model was much better in the regreening stage and diurnal dynamic values were close to the measured values in the whole growth stage. Overall, the PM_Irmak model was a promising model to predict the actual ET, which could provide reference for the evapotranspiration study of paddy field in low hilly red soil area.

Key words:  Canopy resistance, Evapotranspiration, Jarvis, Irmak, Penman-Monteith model

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