铁氧化物在全球土壤碳稳定和储量中的重要作用。

Important role of Fe oxides in global soil carbon stabilization and stocks.

作者信息

Jia Nan, Li Lei, Guo Hui, Xie Mingyu

机构信息

Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China.

Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China.

出版信息

Nat Commun. 2024 Nov 28;15(1):10318. doi: 10.1038/s41467-024-54832-8.

DOI:10.1038/s41467-024-54832-8

PMID:39609446

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11605054/

Abstract

Iron (Fe) oxides can interact with soil organic carbon (SOC) to form Fe-bound organic carbon (OC-Fe), which strongly promotes SOC protection, mitigating global climate change. However, the global patterns and factors controlling OC-Fe are unclear. Here, we conducted a meta-analysis of 3,395 globally distributed soil profiles to reveal the role of Fe-Al oxides in global soil carbon stabilization and stocks. The global OC-Fe stock in topsoil is 233 PgC, accounting for 33 ± 15% of the total SOC stock. A substantial OC-Fe deficit (difference between OC-Fe and OC-Fe) was observed at the equator and at mid-latitudes. Our findings suggest that mineral factors should be incorporated into soil carbon models to improve model predictions. Although there are uncertainties in current OC-Fe extraction method, the global distribution of OC-Fe and OC-Fe constitutes a vital resource for future research targeting carbon cycling issues and offers innovative strategies for global soil carbon sequestration initiatives.

摘要

铁（Fe）氧化物可与土壤有机碳（SOC）相互作用形成铁结合有机碳（OC-Fe），这有力地促进了土壤有机碳的保护，缓解全球气候变化。然而，全球范围内铁结合有机碳的分布模式及控制因素尚不清楚。在此，我们对全球分布的3395个土壤剖面进行了荟萃分析，以揭示铁铝氧化物在全球土壤碳稳定和储量中的作用。表层土壤中全球铁结合有机碳储量为233PgC，占土壤有机碳总储量的33±15%。在赤道和中纬度地区观察到大量的铁结合有机碳亏缺（铁结合有机碳与有机碳之间的差异）。我们的研究结果表明，应将矿物因素纳入土壤碳模型以改善模型预测。尽管目前铁结合有机碳的提取方法存在不确定性，但铁结合有机碳和有机碳的全球分布构成了未来针对碳循环问题研究的重要资源，并为全球土壤碳固存计划提供了创新策略。