| Evapotranspiration of rainfed naked oat field in Bashang region of Hebei Province |
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| DOI：10.7606/j.issn.1000-7601.2021.04.26 |
| Key Words: large weighing lysimeter RZWQM2 model field evapotranspiration naked oat field Bashang region of Hebei Province |
| Author Name | Affiliation | | PEI Hongwei | Hebei University of Architecture, Zhangjiakou, Hebei 075000, China
Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources, Zhangjiakou, Hebei 075000, China | | ZHANG Hongjuan | Hebei University of Architecture, Zhangjiakou, Hebei 075000, China
Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources, Zhangjiakou, Hebei 075000, China | | WANG Feixiao | Hebei University of Architecture, Zhangjiakou, Hebei 075000, China
Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources, Zhangjiakou, Hebei 075000, China | | WANG Xin | Zhangjiakou Institute of High Efficiency in Agricultural Water\|saving, Zhangjiakou, Hebei 075000, China | | SHEN Yanjun | Center for Agricultural Resources Research, Shijiazhuang, Hebei 050021, China | | MA Hong | Hebei University of Architecture, Zhangjiakou, Hebei 075000, China |
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| Abstract: |
| In order to evaluate the field evapotranspiration of naked oat in dryland in Bashang region of Hebei Province, large weighing lysimeter was used to measure field evapotranspiration during the growth periods of naked oat field in 2018 and 2019. The dynamic process of field evapotranspiration was simulated by Root Zone Water Quality Model (RZWQM2). Furthermore the environmental driving factors of these dynamic process were also analyzed. The results showed that the RZWQM2 model performed well in simulating the field evapotranspiration during the growth period of naked oat, MAEs were 1.11 mm·d-1 and 1.19 mm·d-1 in calibration and validation years, respectively, and R2 were 0.71 and 0.68 in both years. The variation of evapotranspiration during growing period showed the trend in which the field evapotranspiration increased first and then decreased in the entire period, with the daily average maximum evapotranspiration occurring in booting period (5.02 mm·d-1 in 2018 and 5.41 mm·d-1) in 2019. The average daily evapotranspiration during different growth stages were as follows: booting stage > flowering stage > maturity stage > jointing stage > seedling stage, and the change was consistent with leaf area index. In two different weather conditions (cloudy and sunny), the field evapotranspiration of rain\|fed naked oat mainly concentrated in the daytime (6∶00 AM to 6∶00 PM), accounting for approximately 83% of the total evapotranspiration. In contrast, evapotranspiration at night (from 6∶00 PM to 6∶00 AM) was lower and more stable, accounting for approximately 16% of the total evapotranspiration. The weather influenced the evapotranspiration process of rain\|fed naked oat more dramatically, as the field evapotranspiration on sunny day was about twice of cloudy day. |
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