Work

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

Year: 2024

Type: article

Study designs: Systematic Review, Meta-Analysis

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-Femax) 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-Femax constitutes a vital resource for future research targeting carbon cycling issues and offers innovative strategies for global soil carbon sequestration initiatives. Iron oxides stabilize soil organic carbon globally, with OC-Fe accounting for 33 ± 15% of SOC in topsoil (233 PgC). A global OC-Fe deficit is evident at the equator and mid-latitudes, highlighting opportunities for carbon sequestration strategies

Source: Nature Communications

DOI: 10.1038/s41467-024-54832-8

Authors: Nan Jia, Lei Li, Hui Guo, Mingyu Xie

Institutions: Chinese Academy of Sciences, Xinjiang Institute of Ecology and Geography, University of Chinese Academy of Sciences, North China University of Water Resources and Electric Power

Language: English

Topic: Soil Carbon and Nitrogen Dynamics

Subfield: Soil Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDGs: Climate action, Life on land, Zero hunger

Open Access status: gold

Estimated APC paid: $6,790