| Estimation of grape evapotranspiration in semi\|humid region based on Bowen ratio energy balance method |
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| DOI：10.7606/j.issn.1000-7601.2020.04.22 |
| Key Words: vineyard evapotranspiration Bowen ratio\|energy balance method single crop coefficient method double crop coefficient method semi\|humid region |
| Author Name | Affiliation | | YU Zhaojun | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100 | | HU Xiaotao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100 | | RAN Hui | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100 | | WANG Xuemeng | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100 | | WANG Wene | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100 | | HE Xuexia | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100 |
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| Abstract: |
| In order to accurately estimate the evapotranspiration (ET) of vineyards in the sub\|humid region based on the determination of meteorological data, this study analyzed and evaluated the applicability of Bowen ratio\|energy balance method in estimating grape evapotranspiration in semi\|humid areas and the variation rule of grape ET during the whole growth period by taking the measured ET of water balance method as a reference. Then, single crop coefficient method (Kc) and double crop coefficient method (Kcb) were used to estimate grape ET in semi\|arid areas. Results showed that the root mean square error (RMSE) and coefficient of Nash (NSE) between Bowen ratio-energy balance method of the total growth period and the method of water balance were 0.54 and 0.64, respectively, and the determination coefficient was 0.82.Bowen ratio\|energy balance method can be better applied to semi\|humid region vineyard evapotranspiration estimation, in contrast, the method of double crop coefficient estimate result was more accurate than the single crop coefficient method.The calculated dual crop coefficients of 0.85, 1.07, and 0.71 can be used as values in this region to provide theoretical basis for semi\|humid region vineyard moisture management. |
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