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永久土融池中铁和碳之间的相互作用

Ankita Chauhan¹, Monique S Patzner², Amrita Bhattacharyya³

¹Geomicrobiology, Department of Geosciences, University of Tübingen, Germany; Cluster of Excellence EXC 2124 Controlling Microbes to Fight Infection, Tübingen, Germany.

The Science of the total environment

|June 28, 2024

概括

永久土的融化池捕获有机碳 (OC) 和铁 (Fe). 铁和OC在这些池中重新结合,可能会保护碳免受分解,并稳定铁的氧化还原状态.

科学领域:

环境科学环境科学
地质化学地质化学
微生物学微生物学

背景情况:

解永久土形成了解池,这对碳和元素运输至关重要.
铁 (Fe) 影响土壤中的有机碳 (OC) 微生物降解,但其在解池中的作用尚不清楚.

研究的目的:

研究沼泽和融池中的铁-有机碳相互作用.
了解铁如何影响融化永久土环境中的碳循环.

主要方法:

使用尺寸分离 (LPF,SPF,DF),酸提取,SEM,Fe K边缘XAS和FTIR光谱.
分析了不同类型的融化池中的铁和有机碳度和物种化.

主要成果:

沼泽池的总Fe含量低,TOC高于池.
铁主要存在于溶解分数 (>75%) 和与天然有机物 (8-80%) 复合.
Fe(II) 主导颗粒物分数,而 Fe(III) 在溶解分数中更为丰富,表明融阶段和颗粒大小影响Fe的氧化还原状态.

结论:

永久土解释放的铁和有机碳在解池中重新结合起来.
这种重新关联可能会保护有机碳免受微生物分解,并稳定铁的氧化还原状态.

关键词:

铁的物种化铁的物种化铁与碳的相互作用有机碳有机碳是有机碳的组成部分.永久土土壤的土壤解池是解池中的一个.

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