与堆肥相比,用液体肥料灌促进了土壤-玉米系统中抗生素耐药性基因的垂直迁移
1School of Ecology and Environment, Inner Mongolia Key Laboratory of Pollution Control and Low Carbon Resource Utilization, Inner Mongolia University, Hohhot, 010021, China.
Journal of environmental management
|November 9, 2025
概括
液体肥料灌显著增加土壤和玉米植物的抗生素耐药性基因 (ARG),促进它们垂直迁移到更深层的土壤层,并可能危及作物和地下水安全.
科学领域:
- 环境微生物学环境微生物学
- 土壤科学 土壤科学
- 农业科学 农业科学
背景情况:
- 抗生素耐药性基因 (ARG) 是持续的环境污染物,而便应用是其中一个重要来源.
- 液体肥料灌与堆肥应用对土壤植物系统中ARG垂直迁移的比较影响仍未得到充分研究.
研究的目的:
- 在不同的肥料化策略下 (液体肥料与堆肥) 调查ARG在土壤-玉米系统中的垂直迁移.
- 评估受精对ARG丰富度,分布和相关微生物群落的影响.
主要方法:
- 实地实验使用土壤-玉米系统进行,使用不同的肥料处理.
- 在土壤和玉米组织 (根,茎,叶) 中量化了115个ARG和22个移动遗传元素 (MGE).
- 进行了源追踪分析和土壤细菌社区概况分析.
主要成果:
- 与堆肥相比,液体肥料显著增加了土壤 (2.20倍),根 (1.10倍) 和茎 (1.45倍) 的ARG丰度.
- 在45-60厘米的土壤深度,ARG的丰度增加了4.30倍,这表明垂直迁移.
- 液体肥料对深层土壤ARG的贡献比堆肥 (3.87%) 更多 (8.04%).
- 施肥类型强烈影响了土壤细菌群落,ARG/MGE分布和水平基因转移.
结论:
- 液体肥料灌促进了ARG在土壤玉米系统中的垂直迁移,从而增加了耐药性风险.
- MGEs在ARG的丰富性中发挥着主导作用,液体便增强了ARG的微生物能力.
- 在深层土壤和植物中增加的ARG水平引发了对作物安全和地下水质量的担忧.
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