氧化铁促进了碳的物理化学稳定,尽管它增强了大米根球中的微生物活动
Han Sun1, Xiaomin Ma2, Lukas Van Zwieten3
1Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China.
The Science of the total environment
|December 14, 2024
概括
将铁 (Fe) 氧化物添加到大米土壤中可以通过促进物理化学稳定来增强碳 (C) 储存,尽管增加了微生物活动热点. 这种铁介导的过程使土壤聚合物中的有机C固定不动.
科学领域:
- 土壤科学 土壤科学
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
背景情况:
- 米根球是影响碳循环的微生物热点.
- 大米根球中的铁斑形成会影响有机碳 (C) 和微生物活动.
- 铁 (Fe) 通过稳定和矿化在米根球中对碳储存的影响尚未完全理解.
研究的目的:
- 研究铁 (Fe) 氧化物对大米根球中碳矿化和稳定性的影响.
- 评估Fe对根茎沉积 (rhizo-C) 和土壤有机碳 (SOC) 的影响.
- 在不同氧化铁度下分析微生物群落转移和酶活性局部化.
主要方法:
- 微观世界实验使用13C-CO2脉冲标记大米 (Oryza sativa L.).
- 使用四种水平的α-铁氧化 (α-FeOOH) (控制,10%,20%,40%).
- 量化微生物群落组成 (16S rRNA测序) 和酶活动 (酶谱).
主要成果:
- 添加铁增加了20-50%的微生物活动热点,但通过Fe-有机物 (Fe-OM) 共同降水促进了碳固定.
- -20%和-40%的处理方法分别减少了41%和33%的矿沉积产生的13C-CO2排放量.
- 在0.25-2毫米的土壤聚合物中,由于Fe-OM共同降水和聚合物形成,观察到13C稳定性增加.
- 添加Fe有利于氧化Fe的细菌 (例如,Pseudomonas),增强Fe-OM的共降.
结论:
- 阿尔法铁氧化 (α-FeOOH) 的添加增强了大米根球中有机碳的物理化学稳定.
- 尽管微生物活动热点增加,但氧化铁通过共同降水和聚合物形成促进碳捕获.
- 氧化铁在调节水生态系统中的碳储存动态方面发挥着重要作用.
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