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连续点火损失作为一种简单的方法,用于评估土壤有机物在实际环境条件下的稳定性

Yuhi Satoh¹, Shigehiro Ishizuka², Syuntaro Hiradate³

¹Department of Radioecology, Institute for Environmental Sciences (IES), Aomori, 039-3212, Japan.

Environmental research

|October 3, 2023

概括

温度损失点火 (SIT-LOI) 的逐步增加有效地评估了土壤有机物 (SOM) 的稳定性. 这种方法与SOM平均停留时间的相关性很好,为碳循环动态提供了洞察力.

科学领域:

土壤科学土壤科学
环境科学环境科学
地质化学地质化学

背景情况:

土壤有机物 (SOM) 是一个主要的陆地碳储库,对全球碳循环至关重要.
了解SOM稳定性对于预测碳捕获和气候变化影响至关重要.

研究的目的:

评估逐步增加点火时温度损失 (SIT-LOI) 的实用性,以评估土壤有机物稳定性.
为了将SIT-LOI反应与土壤属性相关联,例如有机物质含量,矿物质含量和SOM平均停留时间 (MRT).

主要方法:

分析不同有机物 (OM) 和矿物质含量的土壤样本.
应用SIT-LOI来确定SOM对温度升高的反应.
线性回归建模SOM损失作为LOI温度的函数.
测量 Δ¹⁴C, C/N, C/H 比率,以及 δ¹³C 来描述 SOM.

主要成果:

对SIT-LOI的SOM反应通过在各种土壤类型中通过线性回归成功建模.
回归模型的斜率与SOM MRT有很强的相关性,这表明它在反映SOM稳定性的有效性.
随着LOI温度的增加,Δ14C值下降,这证实了较旧的SOM分数的优先保留.
在斜率值和OM/矿物质含量之间发现了显著的相关性,突出了它们在SOM稳定中的作用.

结论:

SIT-LOI是一种简单,有效的方法,用于评估土壤有机物在各种环境条件下的稳定性.
在LOI分析过程中,SOM的矿物协会显著影响其反应.
SIT-LOI方法为SOM平均停留时间和整体稳定性提供了可靠的代理.

关键词:

碳循环是一个碳循环.在点火时的损失.平均居住时间.放射性碳 ((14) C) 的使用.土壤有机物质土壤有机物质.热力学稳定性热力学稳定性

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