| 郑玉红,罗艳丽,晁博,董乐乐,宋振,王美娟.高砷地下水灌溉对As在盐渍化农田土壤中迁移的影响[J].农业环境科学学报,2025,44(5):1256-1265. |
| 高砷地下水灌溉对As在盐渍化农田土壤中迁移的影响 |
| Effects of high arsenic groundwater irrigation on As migration in salinized farmland |
| 投稿时间：2024-05-25 |
| DOI：10.11654/jaes.2024-0438 |
| 中文关键词: 高砷地下水 土壤溶液 迁移 As 盐渍化土壤 |
| 英文关键词: high arsenic groundwater soil solution migrate As salinization of the soil |
| 基金项目:国家自然科学基金项目（42067053） |
|
| 摘要点击次数: 163 |
| 全文下载次数: 231 |
| 中文摘要: |
| 为了研究高砷地下水灌溉后As在盐渍化农田土壤中的迁移特征，明确As在农田土壤中水平和垂直方向的迁移距离，揭示As在农田土壤中的迁移过程，正确进行土壤As污染控制，本试验以新疆奎屯126团的棉田为研究对象，针对当地强蒸发环境背景和盐渍化土壤特点，通过大田试验，结合土壤溶液取样器和阳离子交换膜的采样分析，探究不同灌水周期下As在中度和重度盐渍化土壤中的水平和垂直方向的迁移特征。结果表明：高砷地下水灌溉后，8 h内（0，20]cm各土层土壤溶液中As浓度均呈现出逐渐下降的趋势，地下水中的As进入土壤后会逐渐被土壤颗粒所吸附，致使土壤溶液中的As逐渐减少。（0，10]cm土层土壤溶液As浓度显著高于（10，20]cm土层土壤。随着灌溉次数增加，土壤溶液中As的浓度上升。重度盐渍化土壤的土壤溶液中As的浓度高于中度盐渍化土壤溶液。As在中度盐渍化土壤中水平距离上主要迁移到3.8 cm位置，垂直方向主要迁移到4.0 cm位置；而在重度盐渍化土壤中，As在水平和垂直方向上迁移到6.0 cm和8.0 cm位置。灌溉5周后，地下水中的As在土壤中累积，中度盐渍化土壤中的As浓度在（0，5]cm土层的增长率最高，重度盐渍化土壤中的As浓度在（5，10]cm土层的增长率最高。土壤中的盐分会促进As在垂直和水平距离上的迁移，盐渍化农田土壤更要关注高砷地下水灌溉后的环境风险。 |
| 英文摘要: |
| In order to study the migration characteristics of As in salinized farmland soil after high arsenic groundwater irrigation, clarify the horizontal and vertical migration distances of As in farmland soil, reveal the migration process of As in farmland soil, and correctly control soil As pollution, in this study, we took the cotton field of the Kuitun 126 Regiment in Xinjiang as the research object, we explored the horizontal and vertical migration characteristics of As in moderately and severely salinized soil under different irrigation cycles according to the local strength of environmental evaporation background and salinized soil characteristics. The results showed that after irrigation of high arsenic groundwater, the concentration of As in the soil solution of each soil layer at（0, 20] cm showed a gradually decreasing trend within 8 h, and the As in groundwater was adsorbed by soil particles resulting in a progressively decreasing As concentration change in the soil solution. The As concentration of soil solution in（0, 10] cm soil layer was significantly higher than that in （10, 20] cm. With the increase in irrigation time, the mass concentration of As in the soil solution increased. The concentration of As in the soil solution of severely salinized soil was higher than that in the solution of moderately salinized soil. As mainly migrated to 3.8 cm horizontally and 4.0 cm vertically in moderately salinized soil. In heavily salinized soils, arsenic migrates to 6.0 cm and 8.0 cm horizontally and vertically. After 5 weeks of irrigation, As concentration in groundwater accumulated in the soil, the growth rate of As concentration in moderately salinized soil was the highest at（0, 5] cm, and the growth rate of As concentration in severely salinized soil was the highest at（5, 10] cm. The salinity in the soil will promote the migration of As in the vertical and horizontal distances, and more attention should be paid to the environmental risks of high-arsenic groundwater irrigation in salinized farmland soil. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
