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在周期性无氧下,铁驱动的土壤碳的快速分解

Ting Liu^1,2, Xin Wang^1,2,3, Simin Wang^1,2,3

¹Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China.

Global change biology

|April 15, 2025

概括

定期的土壤无氧,通常被认为是为了保存土壤有机碳 (SOC),可以加速其分解. 铁的减少推动了这种快速的SOC损失,特别是在富含铁和有机物质的土壤中,影响了碳循环.

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:

土壤有机碳 (SOC) 的分解对于土壤和大气之间的碳交换至关重要.
气候变化影响土壤的氧化还原条件,影响SOC分解.
经常假设周期性无氧会保存SOC,但发现是矛盾的.

研究的目的:

调查周期性无氧对不同中国土壤中SOC分解率的影响.
在无氧条件下识别SOC分解的关键驱动因素.
了解铁减少在无氧SOC损失中的作用.

主要方法:

在24度度梯度的20个土壤上进行化实验.
在氧和无氧条件下测量二氧化碳和甲产量.
对替代终端电子受体 (TEA),微生物群落和土壤特性进行分析.
随机森林建模以确定SOC分解的关键预测因素.

主要成果:

70%的土壤与氧气条件相比,呈现出更高或类似的无氧SOC分解率.
减少铁是无氧二氧化碳产生的主要驱动因素 (高达90%).
在水中可提取的有机碳,铁化铁,减少Fe的原核生物和SOC分解率之间发现了积极的相关性.
与铁结合的碳损失相当于高无氧SOC分解.

结论:

周期性无氧可以导致显著的SOC损失,与之前的假设相反.
铁还原在通过释放受保护的碳加速无氧SOC分解方面发挥着关键作用.
富含可降解铁,SOC和降解Fe的微生物的土壤在无氧条件下容易受到加速的SOC损失的影响.
这一途径对于理解气候变化引起的水文变化下的碳循环很重要.

关键词:

无氧没有氧气没有氧气分解,分解,分解.减少铁的减少有机碳与铁结合的有机碳.微生物社区的微生物社区.土壤有机碳土壤有机碳终端电子接受器是指终端电子接受器.

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