不稳定碳诱导的土壤有机物循环在一个亚热带森林在不同的氧化还原条件下
Huan Li1, Guangli Liu1, Haiping Luo1
1Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510006, China.
Journal of environmental management
|October 25, 2023
概括
在不同的氧化还原条件下,不稳定有机碳输入对土壤有机物动态产生不同的影响. 氧化还原波动调节微生物活动,影响土壤碳的分解和形成.
科学领域:
- 土壤科学 土壤科学
- 微生物学 微生物学
- 生物地质化学生物地质化学
背景情况:
- 不稳定有机碳 (LOC) 显著影响土壤有机物 (SOM) 动态,影响收益和损失.
- 氧化还原波动对由LOC输入驱动的SOM分解和形成过程的调节作用仍然不清楚.
研究的目的:
- 为了研究LOC输入对SOM在不同氧化还原条件下的营业额的影响.
- 阐明在波动的氧化还原环境下SOM动态的基础微生物机制.
主要方法:
- 在有氧,无氧和连续的有氧-无氧条件下用13C标记的葡萄糖 (LOC) 化亚热带森林土壤40天.
- 对13C标记的脂脂肪酸 (13C-PLFA) 的分析,以评估微生物组对SOM营业额的贡献.
- 对13C颗粒有机碳 (13C-POC) 的量化,以确定LOC保留.
主要成果:
- LOC输入对土壤原料和13C-SOM积累产生了差异性的影响,基于氧化还原条件,由改变的微生物活动介导.
- 在有氧条件下,真菌和阳性细菌 (K-策略师) 通过利用阴性细菌 (r-策略师) 驱动积极的原始化.
- 从有氧向无氧条件的过渡降低了原始化强度,而无氧则通过限制微生物周转和13C-POC积累,有利于SOM保留.
结论:
- 红氧调节的微生物活动在响应LOC输入时,对SOM分解和形成进行关键控制.
- 了解这些氧化还原介导过程对于评估波动的土壤环境在全球碳循环中的作用至关重要.
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