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在湿地水表波动期间,土壤矿物质可能保留溶解的有机物质

Simin Wang¹, Ting Liu², Erxiong Zhu²

¹State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, PR China; China National Botanical Garden, Beijing 100093, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; National Engineering Laboratory for Site Remediation Technologies, Beijing Construction Engineering Group Environmental Remediation Co. Ltd., Beijing 100015, PR China.

|March 8, 2024

概括

湿地的地下水位波动可以通过将其保留在土壤矿物质,特别是素化合物中来减少溶解有机碳 (DOC). 这种受铁氧化影响的矿物保留是影响碳出口的重要但被低估的过程.

科学领域:

环境科学环境科学
土壤科学土壤科学
生物地质化学生物地质化学

背景情况:

湿地是下游出口的溶解有机碳 (DOC) 的重要来源.
水平面的波动 (WTF) 影响DOC出口,主要是通过增强生物降解.
矿物保留在减轻WTF期间的DOC出口中的作用未得到充分研究.

研究的目的:

调查土壤矿物质在WTF过程中保留溶解有机物 (DOM) 的潜力.
将矿物质保留与生物降解作为DOC减少机制进行比较.
为了确定控制矿物DOM保留的因素.

主要方法:

来自三个湿地的完整土壤柱,含有不同矿物质的土壤柱,经过了水表操纵实验.
批量吸附实验和里埃转换离子循环子子共振质谱法被用于分析DOM组成和吸附.
光谱学和对胺醇的分析量化了DOM变化和矿物质结合.

主要成果:

矿物质吸附优先保留了素,芳香和类化合物,与生物降解不同,生物降解的目标是蛋白质和碳水化合物类化合物.
七个周期的WTF显著降低了吸附性DOM化合物和DOC吸附性.
铁的氧化状态是控制DOM保留的关键因素,在富含铁的土壤中观察到矿物质结合的氨基的增加.

结论:

DOM的矿物保留是减少WTF期间DOC出口的重要途径,与生物降解相似.
"铁门"机制,涉及铁 (水) 氧化物,在保护土壤碳方面发挥着至关重要的作用.
矿物-DOM相互作用在湿地碳循环中是一个被低估的过程,在不断变化的环境条件下值得进一步关注.

关键词:

溶解有机碳 (DOC) 是一种有机碳.矿物质的相互作用吸附吸附方式吸附吸附方式地表水位的波动.湿地湿地湿地

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