长期的米土壤开发缓冲了硫酸肥后甲基化和硫酸肥的增加
José M León Ninin1, Nathalie Kryschak2, Stefan Peiffer2
1Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth 95440, Germany.
Journal of agricultural and food chemistry
|October 30, 2024
概括
硫酸盐施肥可能会增加由于复杂的硫相互作用在年轻的土中有毒的形式. 土壤的历史和条件对于预测的移动性和植物吸收至关重要.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 硫酸盐施肥是一种建议的策略,旨在减少 (As) 流动性和在米土壤中的米粒积累.
- 然而, (As) 和硫 (S) 之间的复杂的生态化学相互作用可以影响As的物种化和毒性.
- 硫可以促进As生物甲基化和非生物化,可能增加有害As化合物的形成.
研究的目的:
- 研究硫酸盐添加对不同年龄的土中的物种化和流动性的影响.
- 了解土壤属性的作用,如有机碳 (SOC) 和铁 (Fe) 的可用性,以及土壤历史在调解AS相互作用中的作用.
主要方法:
- 化米土的年代序列样本 (502000年) 添加和不添加硫.
- 对物种的分析,包括甲基化和硫酸盐.
- 评估土壤特性:土壤有机碳 (SOC),铁 (Fe) 可用性,pH值和微生物活性.
主要成果:
- 最年轻的土壤显示,在S添加后,低吸收性,植物毒性甲基化和硫酸盐的相对增加最高.
- 这些增加与低SOC和Fe,高pH和硫酸盐减少细菌驱动的As甲基化有关.
- 具有较高SOC和Fe的较老,健康的土壤缓冲了这些增加,但受干扰的土壤缺乏这种缓冲能力.
结论:
- 硫酸盐施肥可以通过促进甲基化和硫化,加剧在年轻的土中的毒性.
- 土壤历史,以SOC和Fe的可用性和微生物活动为特征,显著影响对硫酸盐的反应.
- 在在田中实施硫酸盐施肥之前,必须考虑土壤历史,以管理.
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