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在土壤类型中,加热引起的热生成溶解有机物质的含量和分子特征的变化

Qiang Zhang^1,2,3, Yinghui Wang^1,2, Yuhang Zhang^1,2

¹Guangdong Key Laboratory of Soil and Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.

Environmental science & technology

|February 19, 2025

概括

野火显著改变土壤溶解有机物 (DOM). 较高的土壤pH放大了DOM数量和火灾后微生物恢复潜力,特别是在性土壤中.

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:

野火改变土壤溶解有机物 (DOM),影响火灾后的生物地球化学循环和环境质量.
了解加热如何影响各种土壤类型的DOM数量和质量,对于预测生态系统反应至关重要.
土壤属性的地理变化,如pH值,可能会影响野火后DOM变化的程度.

研究的目的:

为了研究加热对不同土壤pH值的土壤DOM数量和质量的影响.
在暴露于野火相关温度 (250°C和400°C) 后,量化DOM特征的百分比变化 (HIC).
为了比较野火对DOM在酸性土壤与性土壤的影响.

主要方法:

使用了不同pH值的中国土壤参考材料.
应用溶解有机碳 (DOC) 量化,吸收和光光谱仪.
采用里叶变换离子循环子共振质谱法 (FTICR-MS) 进行详细的DOM表征.

主要成果:

增加的土壤pH与加热后的DOC含量和DOM生物可溶性更高的百分比变化相关.
较高的土壤pH值导致DOM芳香度相关指数的百分比变化减少.
加热对DOM生物可溶性和阿里法特的影响在性土壤中在250°C时更加明显,但在400°C时稳定.

结论:

野火引起的DOM变化依赖于pH值,性土壤在DOM数量和生物可溶性方面表现出更大的增加.
性土壤可能会在野火后经历增强的微生物恢复,这是由于DOM可用性和可变性增加.
这些发现凸显了土壤类型在调解野火对DOM和随后的生物地球化学过程的影响方面的重要性.

关键词:

里叶变换离子循环子共振质谱学碳黑是一种碳黑.森林大火发生的原因是森林火灾.热生成溶解的有机物质.土壤类型土壤类型

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