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矿物酶相互作用驱动土壤有机碳在永久土中的积累和稳定

Jun-Hao Zhu¹, Jannik Martens², Yakov Kuzyakov^3,4

¹Institute of Surface-Earth System Science, School of Earth System Science, Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China.

Environmental science & technology

|December 2, 2025

概括

永久土土壤储存了大量的碳. 这项研究表明,过氧化酶酶,特别是在北极原,通过矿物相互作用稳定土壤有机碳 (SOC),影响气候反循环.

科学领域:

永久土科学永久土科学
土壤生物地球化学土壤生物地球化学
环境微生物学环境微生物学

背景情况:

永久土中的土壤有机碳 (SOC) 稳定性对于预测温室气体排放至关重要.
已知过氧化酶等氧化酶会降解有机物质,但它们在永久土SOC持久性中的作用尚不清楚.
矿物与微生物的相互作用是SOC稳定的关键.

研究的目的:

研究过氧化酶活性和矿物质对微生物加工的SOC在对比的永久土区域的影响.
探索酶在西藏和阿拉斯加永久土土壤中SOC稳定中的作用.

主要方法:

对氨基糖生物标志物的分析,以评估微生物加工的SOC.
在西藏 (温暖) 和阿拉斯加 (冷) 永久土中SOC和微生物残留成分的比较.
过氧化酶活性的量化及其与矿物结合有机碳的相关性.

主要成果:

与阿拉斯加的土壤相比,西藏的土壤显示出更高的微生物残留衍生的SOC和真菌死体.
在这两个地区,SOC和微生物死体与短距离有序矿物质有很强的联系.
过氧化酶活性在阿拉斯加原土壤中显著高,与矿物结合的SOC相关.

结论:

矿物与微生物的相互作用在稳定永久土中的SOC中起着至关重要的作用.
过氧化酶驱动的H2O2降解是北极永久土中SOC稳定的一种新机制.
这些发现对理解全球变暖下的碳气候反有重大意义.

关键词:

北极永久土是北极的永久土.西藏高原是西藏的高原.氨基糖是氨基糖的氨基糖.有反应性的矿物质.土壤碳稳定土壤碳稳定土壤过氧化酶是什么

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