| 叶 文,王会肖,高 军,刘海军,李 艳.再生水灌溉土壤主要盐离子迁移模拟[J].农业环境科学学报,2014,33(5):1007-1015. |
| 再生水灌溉土壤主要盐离子迁移模拟 |
| Simulation of Salt Ion Migration in Soil Under Reclaimed Water Irrigation |
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| DOI：10.11654/jaes.2014.05.026 |
| 中文关键词: 再生水灌溉 Hydrus-1D 盐离子运移 地下水污染 |
| 英文关键词: reclaimed water irrigation Hydrus-1D salt ion migration groundwater pollution |
| 基金项目: |
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| 摘要点击次数: 1971 |
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| 中文摘要: |
| 在北京市通州新河灌区，再生水已逐步成为农田灌溉的主体水源。与一般常规灌溉水源不同，再生水虽经过处理，仍含有多种重金属和盐分离子以及一些有机污染物。针对再生水灌溉过程中盐离子可能在土壤中积累进而产生地下水污染问题，运用非饱和土壤水流和溶质运移模型Hydrus-1D，模拟再生水灌溉条件下主要盐离子SO2-4、Cl-和NO3-N在土层中的垂向分布及其随时间向深层的迁移情况，讨论了再生水灌溉是否对地下水构成潜在威胁。模拟结果显示，新河灌区的再生水盐离子主要集中在50 cm以内的表层土壤中，其浓度累积不足以迁移到深层土壤并进而污染地下水，盐离子甚至会随着时间的延长逐渐被作物吸收利用。该灌区的使用现状表明再生水进行农田灌溉是可行的，对地下水污染的可能性极小，但为避免表层土壤含盐量超标影响作物生长，建议采用基于土壤环境和作物生命健康的再生水灌溉制度。 |
| 英文摘要: |
| Reclaimed water has gradually become one of the main water sources for agricultural irrigation in the Northern China. Though treated, it may still contain heavy metals, salt ions and organic pollutants, and thus pose potential soil and groundwater pollution. Here, unsaturated soil water and solute movement model Hydrus-1D was used to simulate the vertical distributions of major nutrient ions SO2-4, Cl-, and NO-3 in soil profile over time, in order to understand the potential risk to the underground water. Salts in the current reclaimed water were not high enough to migrate into or pollute the underground water, but were adsorbed and accumulated in soil over time at the Xinhe irrigation district of Tongzhou county. The salt ions were mainly concentrated at the surface soil layer less than 50 cm. Our data show that reclaimed water was safe for agricultural irrigation. In order to prevent the secondary salinization of surface soils, however, high frequent flooding irrigation of reclaimed water should not be allowed, but alternate irrigation of reclaimed water and well water would be recommended. |
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