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外源溶解有机物质的分子组成调节了在米土壤中的溶解铁减少和碳排放

Hai-Bo Wang^1,2, Xi-Peng Liu³, Yu-Chen Shu¹

¹MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.

Environmental science & technology

|June 20, 2025

概括

生物炭和肥料中的溶解有机物 (DOM) 影响土壤碳循环. 复杂的DOM分子结构影响土中的铁减少和温室气体排放 (CH4和CO2).

科学领域:

土壤科学土壤科学
环境微生物学环境微生物学
生物地质化学生物地质化学

背景情况:

在无氧条件下的土壤碳循环与铁 (Fe) 减少密切相关.
外源溶解有机物 (DOM) 对这一过程的影响,特别是在米土壤中,尚未完全理解.
研究复杂的DOM在土壤微生物活动和碳铁合中的作用至关重要.

研究的目的:

探索不同类型的外源性DOM对土壤微生物活动和在米土壤中的碳铁合的影响.
阐明DOM分子组成如何影响铁的减少和温室气体排放 (CH4和CO2) 的机制.
为优化农业资源利用和减轻温室气体排放提供见解.

主要方法:

进行了为期100天的微观宇宙实验.
不同的DOM来源,包括生物炭-DOM和肥-DOM,被引入米土壤.
测量包括铁的减少率,温室气体排放 (CH4和CO2),微生物群体组成和DOM分子特征 (芳香度,DBE,H/C比).

主要成果:

生物炭-DOM显著促进了铁的减少,并加速了CH4和CO2的排放.
肥料-DOM主要增加了土壤的二氧化碳排放.
具有高芳香度和高双键等价性 (DBE) 的DOM通过丰富降低Fe的细菌和r-战略者来促进Fe的减少和CH4的排放,同时减少甲类植物.
具有低芳香度,低DBE和高H/C的DOM通过在化后期促进反复性C降解和CH4氧化来增强CO2排放.

结论:

来自有机修正物的DOM的分子组成对于调节土壤铁减少和温室气体排放至关重要.
特定的DOM结构对微生物群落和生物地化学过程有不同的影响,影响CH4和CO2的产生和氧化.
了解这些关系是可持续农业实践和气候变化缓解战略的关键.

关键词:

生物炭是一种生物炭.碳封存是一种碳封存方式.不相似的铁还原法温室气体排放量排放量温室气体排放量排放量有机变更有机变更土壤微生物群

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