| Cite this article: | 王航,周青云,张宝忠.不同滴灌水量对河套灌区覆膜玉米田土壤盐分的影响研究[J].灌溉排水学报,0,():-. |
| Wang Hang,Zhou Qing-yun,zhangbaozhong.不同滴灌水量对河套灌区覆膜玉米田土壤盐分的影响研究[J].灌溉排水学报,0,():-. |
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| Study on the Effect of Different Drip Irrigation Water Quantity on Soil Salinity of Film-mulched Corn Field in Hetao Irrigation District |
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Wang Hang1, Zhou Qing-yun1, zhangbaozhong2
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1.Tianjin Agricultural University;2.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research
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| Abstract: |
| 【Objective】In order to study the changes of soil salt in farmland drip irrigation under mulch in Hetao irrigation area, spring maize "Jintian No. 8" was used as the test crop, drip irrigation under mulch was adopted, and the irrigation quota was set at 76mm (F1) and 60mm (F2). 【Method】Measure the soil moisture and salt content in the test area, rectify and verify the HYDRUS-2D model based on field test data, Set 4 different irrigation scenarios: Irrigation quota 81 mm (W1), Irrigation quota 135 mm (W2), Irrigation quota 171 mm (W3) and Irrigation quota 204 mm (W4),simulate the changes in soil salinity under different irrigation amounts under mulch drip irrigation, and analyze the results. 【Result】During the growth period, the total salt content of the 0-100 cm soil layer and the fluctuation of the salt outside the membrane in the F1 treatment were smaller than those in the F2 treatment, while the change trend of the salt inside the membrane in the F1 and F2 treatments was basically the same; The changing trend of salt in the membrane during the growth period of F1 and F2 treatments is basically the same After the growth period, F1 and F2 treatments 0~100cm soil layer total salt content decreased by 50.1% and 10.8% respectively, of which the percentage of salt reduction in the membrane to the total reduction was 44.7% and 148.5%. Before autumn irrigation , FI and F2 treatments increased the total salt content of 0~100cm and 0~60cm soil layer and the salt content in the membrane. The total salt content of 0~100cm soil layer and the increase of the salt content in and outside the membrane in F1 treatment were significantly less than that in the F2 treatment. There is a good agreement between the soil moisture content and the simulated and measured values of salinity, and the model can be used to predict the change of soil salinity under the condition of drip irrigation under mulch. Under different irrigation conditions, when the irrigation quota is 162mm, the soil salinity in the 0-20cm soil layer after irrigation is small and the time interval for salinity starts to rise is longer. When the irrigation quota is 108mm, the soil salinity in the 0-40cm soil layer after irrigation is larger, but The time interval between the 20~40cm soil layer that the salinity starts to rise is relatively large. 【Conclusion】Suitable drip irrigation is conducive to reducing the salinity of 0 to 40 cm soil salt, promoting the migration of membrane in the membrane. This research can provide theoretical support and scientific guidance for the promotion and application of drip irrigation technology under film in farmland in Hetao Irrigation District. |
| Key words: soil; moisture; salinity; drip irrigation under mulch; numerical simulation; HYDRUS-2D |
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