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野火对溶解有机物在其通过土壤的过程中发生的分子变化的影响

Xinghong Cao¹, Sheng-Ao Li¹, Hai Huang¹

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

Environmental science & technology

|June 21, 2024

概括

野火增加了土壤中的热性溶解有机物 (pyDOM). 这个 pyDOM 是 pyDOM.

科学领域:

环境化学环境化学
生物地质化学生物地质化学
野火科学野火科学野火科学

背景情况:

全球野火的频率和强度正在增加.
这导致了更大的烧制溶解有机物 (pyDOM) 产量.
pyDOM影响河流碳循环和饮用水安全,但其从土壤转化为水的转化尚未得到充分研究.

研究的目的:

为了研究野火后土壤溶解有机物 (DOM) 属性的变化.
了解pyDOM沿着山坡梯度和土壤深度的空间分布.
评估受野火影响的DOM的生物降解性和转化潜力.

主要方法:

沿着山坡的坡度和深度在燃烧和未燃烧的流域的土壤DOM提取.
高分辨率质谱仪 (HRMS) 用于分子表征.
基质显式建模以评估DOM生物降解性.

主要成果:

受到野火影响的土壤DOM显示了缩芳分 (ConAC) 和色素的增加.
野火DOM表现出更广泛的分子和热力学特性,表明不同的组成和反应性.
由于微生物活动减少,在烧伤区域的土壤深度随着宁类化合物的增加而增加.
虽然在燃烧的流域中普遍存在ConaC和化物,但在山坡上它们的丰度下降了.

结论:

野火DOM属性在山坡上空间分布.
野火DOM的生物降解性表明了转化潜力.
调查结果有助于评估流域规模的野火后溶解有机碳动态.

关键词:

分子特性分子特性.热生成的溶解有机物质.土壤中溶解的有机物质.土壤过的过方法野火大火在野火大火

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