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在回氧振荡期间的土壤有机物质调节:来自铁的特异化和微生物代谢的见解

Zhenchen Li¹, Xiaoyun Li¹, Yushu Yang¹

¹Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing 400045, China.

Environmental science & technology

|February 21, 2026

概括

河岸地区的氧化还原振荡改变了土壤有机物 (SOM) 的转化,由循环铁矿物质和影响微生物代谢. 这些变化会影响碳循环,随着时间的推移,影响会减少.

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:

土壤有机物 (SOM) 是一个主要的陆地碳储库,对全球碳循环至关重要.
河岸地区的水文波动会引起氧化还原振荡,改变SOM转换的动态.
铁矿物和微生物群落在氧化还原条件下是关键的SOM调节者,但它们的具体作用尚不清楚.

研究的目的:

研究铁的物种化和微生物代谢如何影响沿海土壤中 redox 振荡下的 SOM 转化.
阐明铁矿物质,微生物和SOM在氧化还原循环中的机械联系.

主要方法:

对河岸土壤进行了化,以模拟水文波动.
铁的物种化,微生物的新陈代谢 (糖解,TCA循环,氧化酸化) 和二氧化碳的流量率被监测.
分析了SOM组成 (例如,红素) 和铁减少效率的变化.

主要成果:

氧化还原振荡导致周期性铁转化,释放结合铁的碳并产生基基.
基质生物可用性增加提高了微生物代谢途径的调节,在氧化阶段显著增加了CO2流量.
铁矿物质结晶和SOM变化降低了微生物代谢的调节,并随着时间的推移降低了铁的降解效率.
氧化还原振荡对SOM转换的影响随着周期数量的增加而减少.

结论:

反氧振荡在沿海生态系统中,在铁矿物质,微生物和SOM之间产生复杂的相互作用.
这些相互作用调节碳循环,最初增加二氧化碳的释放,随后由于代谢下调而抑制.
了解这些Fe-矿物-微生物-SOM的联系对于管理沿海生态系统和预测碳动态至关重要.

关键词:

的特异化.一个基基的氧基.微生物的新陈代谢氧化还原振荡的振荡.土壤有机物质土壤有机物质.

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