物理化学保护的有机碳释放是土土壤中根球原始化的速度限制步骤
Cuiyan Wu1, Wei Huang2, Yixian Liu3
1School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, China; State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; Ningbo Key Laboratory of Testing and Control for Characteristic Agro-Product Quality and Safety, Ningbo 315211, China.
The Science of the total environment
|October 16, 2024
概括
氧化铁控制土壤有机物 (SOM) 释放和米土壤中的温室气体排放. 在无毒条件下,受酸影响的Fe(III) 减少是调节根球原始效应 (RPE) 的关键.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 氧化铁影响土壤有机物 (SOM) 稳定性和米土壤的温室气体排放.
- 在无毒条件下,根球原始效应 (RPE) 的大小和控制因素仍然不清楚.
- 氧化铁调节SOM的可访问性和微生物活动,影响RPE.
研究的目的:
- 研究Fe (III) 降解机制如何影响米土壤中的RPE.
- 阐明酸作为电子运送器在调节RPE中的作用.
- 在无毒条件下确定控制RPE大小的关键因素.
主要方法:
- 持续的13CO2标签大米植物.
- 测量二氧化碳和CH4排放量以量化RPE.
- 分析Fe (III) 减少及其对SOM和微生物活动的影响.
主要成果:
- 酸增加了RPE (CO2排放量) ~25%,并减弱了CH4 RPE.
- 根生长和Fe (III) 减少刺激了CO2排放,独立于微生物生物质和酶活性.
- 增加的反应性Fe (III) 含量与减少的RPE相关,表明SOM保护.
结论:
- 酸加快的Fe (III) 降解,释放与酸结合的有机碳,并增强RPE.
- 通过Fe (III) 减少和聚合物的破坏对SOM的非生物转化调节了RPE.
- 反应性Fe (III) 矿物减少是SOM释放的速度限制步骤,控制在米土壤中的RPE大小.
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