确定氧气遗留如何影响土壤脱剂社区动态和N2O排放的轨迹
Louise B Sennett1, Constance A Roco2,3, Natalie Y N Lim2
1Faculty of Chemistry, Biotechnology, and Food Sciences, Norwegian University of Life Sciences, Norwegian University of Life Sciences, Ås, Norway. louise.sennett@nmbu.no.
Nature communications
|August 24, 2024
概括
重复的氧气转移会影响土壤微生物. 不断暴露于氧气令人惊地增加了脱和氧化 (N2O) 的减少,与间歇性无氧期不同,影响微生物群落和N2O排放.
科学领域:
- 环境微生物学环境微生物学
- 生物地质化学循环 生物地质化学循环
- 温室气体排放量排放量 温室气体排放量
背景情况:
- 脱对于循环至关重要,产生N2O.
- 氧气 (O2) 水平调节了脱,但对波动的O2的反应尚不清楚.
- 循环氧化/无氧化转变发生在许多自然和人工环境中.
研究的目的:
- 研究农业土壤微生物群落如何对不同氧气波动模式做出反应.
- 确定不同无氧期持续时间对脱和N2O减少率的影响.
- 将微生物社区适应氧气历史与N2O排放潜力联系起来.
主要方法:
- 农业土壤被循环暴露在长时间的无氧期 (LA),短时间的无氧期 (SA) 或恒定的氧气条件 (Ox) 中.
- 在最后的无氧化后,测量了脱和N2O减少率.
- 甲基转录组学被用来分析化剂社区的组成和基因表达.
主要成果:
- 与LA和SA处理相比,恒定的氧气条件 (Ox) 导致显著更高的脱和N2O减少率.
- 细菌生物质和脱基因丰富度在不同治疗方法中相似.
- 甲基转录组学揭示了不同的脱剂社区组成和功能伙伴关系 (nosZ clade I vs. II),这取决于O2暴露史.
结论:
- 无氧事件的持续时间极大地影响了无化器社区的适应性和功能.
- 之前的氧气暴露史,特别是恒定的氧气条件,可以为增强的脱和N2O减少准备土壤.
- 准确预测N2O排放需要考虑环境的氧气遗产.
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