水和硫酸盐管理操纵了微小的土壤循环
Yi Yang1, Wen Fang1, Paul N Williams2
1State Key Laboratory of Water Pollution Control and Green Resource Recycling, School of Environment, Nanjing University, Jiangsu, 210023, China.
Environmental pollution (Barking, Essex : 1987)
|January 6, 2026
概括
高硫酸盐水平增加了表面附近淹水的水土壤中的的流动性. 然而,硫酸盐的添加和间歇性洪水可以通过促进铁和硫酸盐的减少来降低深层土壤中的的生物可用性.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- (As) 是一种致癌污染物,其在土壤中的行为与硫酸盐反应和微生物活动有关.
- 田表现出复杂的氧化还原条件,影响 (As) 和硫酸盐相互作用.
- 在亚厘米尺度上了解酸盐和硫酸盐相互作用对于有效的补救至关重要.
研究的目的:
- 调查硫酸盐含量和洪水管理对的物种化和流动性的影响.
- 阐明微生物铁和硫酸盐减少在不同条件下的转化中的作用.
主要方法:
- 中宇宙实验模拟连续和间歇性洪水,并没有添加硫酸盐.
- 使用DGT和DET技术在millimeter-scale尺度上对溶解的 (AsIII),硫化物 (S-II) 和铁 (FeII) 在现场进行分析.
- 厘米尺度的土壤DNA分析,以量化微生物的功能群,特别是减少铁和硫酸盐的细菌.
主要成果:
- 高硫酸盐度增强了近地 (0-2厘米) 层中的AsIII在连续洪水下.
- 在更深的无氧区 (低于4厘米),硫酸盐添加抑制了通过FeS沉通过40%的AsIII调动,由增强的铁和硫酸盐减少细菌活动驱动.
- 洪水模式的差异 (连续与间歇) 主要影响了顶部2厘米的As动员;更深的配置显示了类似的As分布.
结论:
- 硫酸盐管理和泛滥策略显著影响在田土壤中的生物可用性.
- 间歇性洪水和较深层土壤中的硫酸盐减少为高硫酸盐环境中的修复提供了有希望的机制.
- 该研究提供了对亚厘米尺度动态的关键见解,为有针对性的整治策略提供了信息.
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