| Cite this article: | 张宝珠,王仰仁,李金玉,等.基于称重式蒸渗仪的春玉米蒸散量研究[J].灌溉排水学报,0,():-. |
| ZHANG Baozhu,WANG Yangren,LI Jinyu,et al.基于称重式蒸渗仪的春玉米蒸散量研究[J].灌溉排水学报,0,():-. |
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| Research on Spring Maize Evapotranspiration based on weighing Lysimeter |
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ZHANG Baozhu1,2,3,4, WANG Yangren1, LI Jinyu3, LIU Hongwu3, WU Chaobao3
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1.School of Hydraulic Engineering,Tianjin Agricultural University;2.China;3.Shanxi Central Irrigation Test Station;4.Shanxi Province,China
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| Abstract: |
| 【Objective】According to the data of spring maize evapotranspiration measure by weighing lysimeter, the variation rule of spring maize evapotranspiration is analyzed and the relationship between yield and water is established, which provided the basis for accurate regulation of spring maize irrigation in Shanxi Province.【Method】The evapotranspiration test of two-year spring maize under different water supply conditions was carried out from 2019 to 2020 using the weighing lysimeter at the central irrigation test station of Shanxi Province. The experiment has 4 treatments, namely T1 (irrigation 5 times), T2 (6 times), T3 (4 times), T4 (2 times). The irrigation time is determined according to the crop water requirement, and the irrigation quota is 60 mm. Each treatment is equipped with a set of weighing lysimeter, and the soil water weigh is automatically recorded per hour. With the application of the principle of water balance, the daily evapotranspiration is calculated and the variation law of evapotranspiration is analyzed, then the relationship between yield and evapotranspiration is established based on the process model with relative evapotranspiration as independent variable.【Result】The results show that evapotranspiration intensity in the middle period of spring-maize growth is higher than that in the other growth stages. Affected by irrigation, the larger the irrigation quota, the greater the intra-day evapotranspiration intensity at different growth stages. For example, the T2 treatment, the maximum evapotranspiration is 0.44 mm/h at 13:00 pm, and the T4 treatment, the maximum evapotranspiration is 0.175 mm/h at 9:00 am, in the mid-development period. Irrigation also affects the evapotranspiration a few days after irrigation. The more irrigation, the more evapotranspiration, and the greater the cumulative evapotranspiration. The evapotranspiration of spring-maize is mainly concentrated in the middle growth stage (52-120 days after sowing), the maximum daily evapotranspiration in this period is respectively 10.68 mm/d in 2019 and 7.27 mm/d in 2020, in which period the corresponding proportion of evapotranspiration account for 75.7% and 72.9% of the whole growth period respectively. The process model with relative evapotranspiration as the independent variable simulates the yield, and the model parameters were calibrated, The results show the fitting effect is very good, the correlation coefficient R2 > 0.99. The model parameters were verified by using the test data of spring corn in Wenyu River from 2018 to 2020, and the correlation coefficient R2 is over 0.94, which indicated that the model parameters are reasonable.【Conclusion】The data obtained from lysimeter can more accurately determine the relationship between yield and water content, In addition, The evapotranspiration calculated using the crop coefficient method recommended by FAO reflects the potential evapotranspiration of the crop. |
| Key words: Lysimeter; Evapotranspiration; Water balance ; Yield; Relative evapotranspiration |
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