| Simulation of soil water and salt transport under mulched drip irrigation based on HYDRUS Model in coastal area |
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| DOI：10.7606/j.issn.1000-7601.2020.05.26 |
| Key Words: water and salt transport simulation soil under mulched drip irrigation HYDRUS-2D model coastal area |
| Author Name | Affiliation | | MA Bo | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384, China
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China | | ZHOU Qingyun | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384, China
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China | | ZHANG Baozhong | State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China
National Center of Efficient Irrigation Engineering and Technology Research, Beijing 100083, China | | WANG Hang | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384, China | | YIN Linping | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384, China |
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| Abstract: |
| Spring maize “Zhengdan 958” was used as the test material in the field experiment. Under mulched drip irrigation with 20 mm and 10 mm irrigation quotas, the contents of soil water and salt were determined. The simulations of soil water and salt transport were carried out by using the model of HYDRUS-2D in this study. By comparing the simulated values with the measured values, the laws of water and salt transport in salinized soil in coastal area were studied. The results showed that the soil salt moved from the middle of the film to the edge of the film in horizontal direction. Therefore, the effect of soil leaching in the center of film was better than that at the edge of film. The soil salt content of 0~20 cm was reduced by 16.1% in the vertical direction. The variation was the largest, and the leaching effect was obvious. The salt leaching effect of the subsoil was moderate, and the decrease in soil salt content was only 9.6%. In the process of soil water redistribution, the variation of soil water and salt contents in 0~20 cm soil layer was greater than that in 20~60 cm soil layer. The inhibition effect of high irrigation quota (20 mm) on soil salt in 0~20 cm, 20~40 cm, and 40~60 cm soil layers was 26%, 11%, and 19% higher than that in low irrigation quota (10 mm), respectively. Moreover, the soil salt was leached below 60 cm soil depth under high quota drip irrigation, while the low quota drip irrigation failed to leach the soil salt below 60 cm. The simulated values of HYDRUS-2D were basically consistent with the measured values of soil water and salt content, and the model was reliable. The simulation results have certain guiding significance for the prevention and salinization control in coastal area with shallow groundwater. |
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