在无毒条件下的有机物质在土壤中的转化
S M Pyzola1, P Dhakal1, M S Coyne1
1Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546, USA.
The Science of the total environment
|March 4, 2025
概括
无毒有机物分解涉及发酵和呼吸. 这项研究表明,这些过程可以同时发生,挑战了以前关于土壤微生物活动和营养循环的观点.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 土壤科学 土壤科学
背景情况:
- 无毒有机物分解是由微生物水解和发酵驱动的,产生酸盐和.
- 微生物呼吸利用各种电子受体,其消耗顺序取决于可用性和能量产量.
- 经典观点认为呼吸比发酵更快,它们不会同时发生,但最近的证据质疑了这一点.
研究的目的:
- 在无毒条件下调查发酵和呼吸的同时发生.
- 在不同排水的土壤中量化化学物种及其转化速率.
- 探索氨生产 (氨化) 和发酵/呼吸之间的联系.
主要方法:
- 混合批次的微观宇宙与土壤原生有机物和终端电子受体进行了化.
- 随着时间的推移,量化了关键化学物种,包括酸盐,酸盐,铁 (II), (II) 和.
- 在无氧条件下分析了四种不同排水状态的土壤.
主要成果:
- 发酵 (乙酸盐生产) 和 (IV) 呼吸同时发生在中等干燥土壤和干燥土壤中.
- 在一些土壤中,由于高酸盐水平作为竞争性电子受体,乙酸盐的产生被抑制.
- 氨化速率与乙酸形成速率有很强的相关性,这表明氨基酸发酵.
结论:
- 这项研究挑战了在无氧环境中发酵缓慢而 (IV) 呼吸快速的范式.
- 研究结果表明,发酵和呼吸可以同时发生,影响有机物分解.
- 结果对了解土壤有机物转化和营养循环,特别是,具有重大意义.
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