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一个基于放射性碳的框架来评估土壤有机碳的持久性和土地利用类型的脆弱性

Luisa I Minich^1,2, Jeffrey Beem-Miller^3,4, Benedict V A Mittelbach²

¹Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland.

Global change biology

|March 17, 2026

概括

土壤有机碳 (SOC) 持久性因土地使用和深度而异. 高山草原和泥炭地中的寒冷无氧条件稳定了碳,但增加了对干扰的脆弱性.

科学领域:

土壤科学土壤科学
生态生态学生态生态学
生物地质化学生物地质化学

背景情况:

土壤有机碳 (SOC) 对土壤健康和气候调节至关重要.
了解SOC的持久性和脆弱性是预测环境变化下的碳捕获和损失的关键.
土地利用和环境条件对SOC的稳定性有很大的影响.

研究的目的:

调查SOC在五种土地使用类型中的持久性和脆弱性.
开发和应用一个新的SOC漏洞指数.
确定SOC稳定和不稳定的主要驱动因素.

主要方法:

结合放射性碳测年法 (SOC系统年龄,呼吸CO2过渡时间) 与生物和热稳定性指标 (SOC可分解性,残留可氧化碳含量 - ROC).
在19个代表不同土地使用类型 (草原,森林,耕地,泥炭地) 和土壤深度的地点应用了脆弱性指数.
分析了SOC年龄,稳定性指标和土地使用类型之间的关系.

主要成果:

SOC年龄在土地使用和深度之间有很大差异 (2至5760年),过境时间通常比系统年龄更短.
有机矿物稳定增强了森林,温带草原和耕地中的SOC持久性.
阿尔卑斯山草原和泥炭地表现出长时间的SOC年龄,尽管热稳定性较低,这表明由于抑制分解而在不断变化的条件下脆弱.

结论:

使用放射性碳数据和稳定性指标的综合方法有效评估SOC的脆弱性.
土地使用类型和环境条件 (温度,湿度) 是SOC持久性和潜在损失的关键决定因素.
管理的泥炭地和高山草原占据了重要的碳储量,容易受到干扰引起的释放的影响.

关键词:

在SOC的动态.SOC 的持久性稳定SOC的稳定性这是一个SOC漏洞.生物稳定性生物稳定性土地使用类型土地使用类型放射性碳的使用方法系统年龄年龄.热稳定性的热稳定性过境时间过境时间

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