| 引用本文: | 陶明鑫,刘 招,马 艳,等.再生水灌溉条件下土壤盐分运移及其影响研究[J].灌溉排水学报,2026,45(7):114-124. |
| Tao Mingxin,Liu Zhao,Ma Yan,et al.再生水灌溉条件下土壤盐分运移及其影响研究[J].灌溉排水学报,2026,45(7):114-124. |
|
| 摘要: |
| 【目的】深入研究再生水灌溉对土壤盐分运移及影响效应，有效降低再生水灌溉对土壤盐分累积的不利影响。【方法】以西安市临潼区再生水灌区为研究区域，灌区内再生水灌溉方式主要是畦灌和沟灌，在区域内采集未灌溉土壤（US）、地下水灌溉土壤（WS）、再生水灌溉土壤（RS）3种土壤，分析其盐渍化指标差异及土壤盐分累积程度和盐分运移规律，使用Hydrus-1D模拟I1（2 925 m3/hm2）、I2（3 525 m3/hm2）、I3（4 050 m3/hm2）3种灌水定额下再生水灌溉土壤的盐分运移过程，分析盐分运移的影响效应。【结果】40~60 cm 土层，再生水灌溉土壤的全盐量比未灌溉和地下水灌溉土壤分别增加12.09%和8.22%，氯化物量高出76.69%、65.49%。对于60~80 cm土层，再生水灌溉土壤的全盐量比未灌溉土壤及地下水灌溉土壤高出2.4%、20.68%，氯化物量分别高出49.86%、7.04%。3种水源灌溉土壤的SAR、pH值无明显差异，40~60 cm土层的全盐量、氯化物量均高于60~80 cm土层，但SAR略低于60~80 cm土层。模拟发现，当灌水定额分别为2 925、3 525、4 050 m3/hm2时，土壤全盐量峰值分别为800、810、815 mg/kg，且60~80 cm深层土壤全盐量超过0~20 cm土壤的时间越早。【结论】研究区再生水灌溉会增加土壤盐分，且40~60 cm土层的盐分累积程度高于60~80 cm土层，土壤盐分有向深层土壤迁移和累积的迹象。再生水灌溉条件下，灌水定额与土壤耕层盐分峰值及盐分向下迁移速率均呈显著正相关，为控制再生水灌溉可能引发的土壤盐渍化风险，需实施精准灌溉，避免过大的灌水定额，以防止盐分在深层大量累积并加速下移。 |
| 关键词: 水资源；再生水；土壤盐分；农业灌溉；盐分运移 |
| DOI：10.13522/j.cnki.ggps.2025301 |
| 分类号: |
| 基金项目: |
|
| Impacts of reclaimed water irrigation on salt transport and composition in soil |
|
Tao Mingxin, Liu Zhao, Ma Yan, Wang Jinfeng, Zhang Jiaqi,Wang Yuying, Zheng Xiaomin, Zhou Weibo
|
|
1. School of Water and Environment, Chang’an University, Xi’an 710054, China; 2. Key Laboratory of Subsurface Hydrology and
Ecological Effects in Arid Region of the Ministry of Education, Chang’an University, Xi’an 710054, China;
3. Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-arid Regions of Ministry of Water Resources,
Chang’an University, Xi’an 710054, China; 4. Xi’an Water Supply Management Center, Xi’an 710016, China;
5. Xi’an Gaoling District Water Resources Service Center, Xi’an 710299, China
|
| Abstract: |
| 【Objective】Reclaimed water has been increasingly used as a complementary irrigation resource to alleviate freshwater shortages, yet its effect on salt components and salt accumulation in soil is poorly understood. This paper aims to fill this gap through experimental investigation of salt composition and salt transport in soil under reclaimed water irrigation.【Method】The experiment was conducted in a reclaimed-water-irrigation area in Lintong District, Xi’an, where furrow irrigation is the dominant irrigation method. It consisted of three irrigation treatments: no irrigation, irrigation using groundwater and irrigation using reclaimed water. We analysed soil chemical properties in each treatment, and then used the Hydrus-1D model to simulate soil water and salt transport under three irrigation scenarios: 2 925 m3/hm2 (I1), 3 525 m3/hm2 (I2), and 4 050 m3/hm2 (I3) to analyse their effects on salt migration.【Result】Salt content in the 40-60 cm soil layer under reclaimed water irrigation was 12.09% higher than that under non-irrigation and groundwater irrigation, and its associated chloride content was 76.69% and 65.49% higher than that of non-irrigation and groundwater irrigation, respectively. Compared with non-irrigation and groundwater irrigation, reclaimed water irrigation increased the total salt content in the 60-80 cm layer by 2.4% and 20.68%, and chloride content by 49.86% and 7.04%, respectively. No significant differences in sodium adsorption ratio (SAR) and pH were identified in the soils under different irrigation water sources. Overall, total salt content and chloride content in the 40-60 cm soil layer were higher, and SAR was lower than that in the 60-80 cm soil layer. Simulation results showed that the peak total salt content increased from 800 mg/kg to 815 mg/kg when irrigation amount increased from 2 925 to 4 050 m3/hm2. Our results showed that salt accumulated in the 60-80 cm layer earlier than in the 0-20 cm layer.【Conclusion】Reclaimed water irrigation elevated soil salinity, with the 40-60 cm layer showing more severe salinization than the 60-80 cm layer. Both peak salt content and downward migration of soil salt were positively correlated with irrigation amount. Precise irrigation management is thus required to mitigate secondary soil salinization. |
| Key words: water resources; reclaimed water; soil salt; agricultural irrigation; salt migration |
