| Simulation of nitrogen distribution characteristics under improved subsurface drainage |
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| DOI：10.7606/j.issn.1000-7601.2020.04.29 |
| Key Words: improved subsurface drainage nitrogen distribution ammonia N nitrate N |
| Author Name | Affiliation | | TAO Yuan | China Institute of Water Resources and Hydropower Research, Beijing, 100048, China
National Center of Efficient Irrigation Engineering and Technology Research (Beijing), Beijing, 100048, China | | XU Di | National Center of Efficient Irrigation Engineering and Technology Research (Beijing), Beijing, 100048, China | | REN Hejing | China Institute of Water Resources and Hydropower Research, Beijing, 100048, China | | WANG Shaoli | China Institute of Water Resources and Hydropower Research, Beijing, 100048, China
National Center of Efficient Irrigation Engineering and Technology Research (Beijing), Beijing, 100048, China |
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| Abstract: |
| In order to explore the environmental effect of the improved subsurface drainage, this project simulated the drainage discharge, nitrogen (N) concentration and the distribution of soil N content under long\|term drainage by improved subsurface drainage system. HYDRUS has been used for parameter calibration and verification based on the field data. The results showed that the soil nitrification increased under improved subsurface drainage system and the improved subsurface drainage could lower groundwater table faster and has better effect on ammonia N reduction. Compared with conventional subsurface drainage, the improved subsurface drainage system made 46% decrease in ammonia N and 17% increase in nitrate N. For the distribution of soil N, under long\|term drainage, the minimum soil ammonia N and nitrate N contents were in 40~60 cm and 20~40 cm soil layer, respectively. At the end of simulation, the minimum soil ammonia N and nitrate N were only at 5% and 10% of initial content, respectively. Compared with conventional subsurface drainage, the soil ammonia N content in 40~60 cm soil layer and soil nitrate N content above the pipe level had small difference of 0.3 mg·kg-1. |
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