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碳命运,铁溶解,以及在不同氧条件下在融化耶多马永久土中溶解有机物质的分子特性

Matheus Sampaio Carneiro Barreto¹, Rucha P Wani^1,2, Aleksandar I Goranov³

¹Department of Plant & Soil Sciences, University of Delaware, Newark, Delaware 19716, United States.

Environmental science & technology

|February 22, 2024

概括

永久土的融化释放出大量的碳. 无氧条件比氧条件更好地保存溶解有机物 (DOM),铁矿物质在永久土降解过程中影响DOM命运.

科学领域:

环境科学环境科学
地质化学地质化学
土壤科学土壤科学

背景情况:

永久土土壤含有大量的碳,约占陆地碳的50%.
仅仅耶多马永久土就占全球土壤碳总量的25%左右.
由于碳释放,永久土的融化对景观稳定性和水资源构成风险.

研究的目的:

为了研究碳和溶解有机物 (DOM) 在不同氧化还原条件下解永久土中的命运.
了解铁 (Fe) 矿物质和氧化还原环境在调节碳组成和反应性的作用.
确定潜在的代理来跟踪永久土解期间的氧化还原条件.

主要方法:

碳命运,铁分数和溶解有机物 (DOM) 隔离物的表征.
在受控的无氧和有氧条件下化永久融样本.
对DOM组成和碳的标称氧化状态 (NOSC) 的分析.

主要成果:

在21天内,氧气 (58%) 和无氧 (33%) 条件下碳损失较高.
在无氧条件下,42%的初始碳被保留在溶解的部分中.
类似脂质的化合物累积,在无氧化过程中NOSC减少,表明碳组成和反应性发生了变化.
DOM动态受到微生物活动和Fe矿物质介导的非生物过程的影响.

结论:

化条件在永久土融化过程中显著影响碳命运和DOM组成.
铁矿物质在调解DOM转换和碳保存方面发挥着至关重要的作用.
DOM化学多样性签名可以作为有效的代理来监测解永久土环境中的氧化还原条件.

关键词:

在FT-ICR MS中使用.气候变化气候变化气候变化溶解的有机物质是一种有机物质.永久土融化-融化氧化氧化还原技术是什么

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