Migrating and Transforming Rule of Nitrogen in Unsaturated Zone in Guanzhong Basin Based on HYDRUS-1D Model
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摘要: 以陕西关中盆地为研究区,利用HYDRUS-1D软件构建土壤水分运移模型、作物根系吸水模型和溶质运移模型,模拟了"三氮"在包气带中的迁移转化过程.结果表明:1)作物根系吸水吸氮规律一致,且主要吸收氨氮形式的氮素,吸收率为35%;2)亚硝态氮和硝态氮更容易被淋失到地下水中,且主要以硝态氮为主;3)不同包气带岩性对"三氮"向下迁移的速率和迁移量影响很大.Abstract: In this paper, we built soil moisture transform model, the crop root water absorption model and the sol-ute transport model with using HYDRUS-1D software, and then, simulated the transportation and transformation of the nitrogen in unsaturated zone at Guanzhong basin in Shaanxi province. The results indicate:1)The rule of crop root adsorbing water and nitrogen is consistent, and the main absorption of ammonia nitrogen, the absorp-tion rate is 35%;2)the nitrate nitrogen and nitrate are more likely to be leaching into groundwater, and are mainly composed of nitrate nitrogen;3)Different unsaturated zone lithology has a great influence on migration rate and amount of nitrogen.
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Key words:
- nitrogen /
- unsaturated zone /
- migration and transformation /
- HYDRUS-1D /
- Guanzhong basin
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