| Characteristics of soil water leakage and nitrate leaching in irrigated farmland based on the Hydrus-1D model |
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| DOI：10.7606/j.issn.1000-7601.2023.05.04 |
| Key Words: soil water leakage nitrate nitrogen leaching Hydrus-1D wheat maize rotation irrigated area |
| Author Name | Affiliation | | YANG Nan | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | DUAN Linbo | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | MA Jing | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | CAI Huanjie | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | PENG Xiongbiao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | WANG Xiaoyun | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | LI Liang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | ZHANG Pengyan | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China | | XU Jiatun | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering， Northwest A＆F University, Yangling， Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China， Northwest A＆F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to quantitatively analyze the characteristics of soil water leakage and nitrate leaching, the Hydrus-1D model was used to simulate the process of soil water and nitrogen transport and transformation in Jinghuiqu irrigation district based on the 3-year soil water and nitrogen experiment under wheat and maize rotation. The results showed that: The Hydrus-1D model accurately simulated the transport process of soil water and nitrate nitrogen at different depths. The soil water leakage under the root layer (200 cm) was mainly affected by the irrigation amount. The soil water leakage under the root layer during the whole growth period of winter wheat was larger than that during the whole growth period of summer maize. The leakage amounts of the two crop were 15.34~25.38 cm and 6.98~9.82 cm, respectively. The soil water leakage intensities under the root layer during the whole growth period of summer maize and winter wheat were 0.06~0.08 cm·d-1 and 0.06~0.10 cm·d-1, respectively. Irrigation treatment during winter wheat’s overwintering period significantly affected the soil water leakage under the root layer during the whole growth period. During the growth period of summer maize and winter wheat, the nitrate leaching flux under the root layer ranged 0.003~0.016 mg·cm-3·d-1 and 0.001~0.032 mg·cm-3·d-1, respectively. Nitrate leaching was positively correlated with irrigation amount, rainfall and nitrate nitrogen content in soil profile, and the response to rainfall and irrigation was lagging, and the nitrate leaching flux in soil under the root layer reached its peak about 12 days after irrigation. The soil nitrate leaching flux under the root layer was higher at the end of summer maize growth and the beginning of winter wheat growth. In summary, the irrigation and fertilization of summer maize and winter wheat should be reasonably planned in production, and the irrigation amount of winter wheat should be appropriately adjusted during the wintering period. The recommended irrigation amount is less than 90 mm during the wintering period. |
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