A global meta-analysis of soil organic carbon in the Anthropocene

Demenois Julien, Beillouin Damien, Cardinael Rémi, Corbeels Marc. 2024. A global meta-analysis of soil organic carbon in the Anthropocene. In : Centennial Celebration and Congress of the International Union of Soil Sciences, Florence - Italy May 19 - 21, 2024 - Abstract Book. SISS. Florence : SISS, Résumé, 1 p. Centennial Celebration and Congress of the International Union of Soil Sciences (IUSS 2024), Florence, Italie, 19 Mai 2024/21 Mai 2024.

https://centennialiuss2024.org/

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Résumé : Anthropogenic activities profoundly impact soil organic carbon (SOC), affecting its contribution to ecosystem services such as climate regulation. Here, we conducted a thorough review of the impacts of land-use change, land management, and climate change on SOC. Using second-order metaanalysis, we synthesized findings from 230 first-order meta-analyses comprising over 25,000 primary studies.We show that (i) land conversion for crop production leads to high SOC loss, that can be partially restored through land management practices, particularly by introducing trees and incorporating exogenous carbon in the form of biochar or organic amendments, (ii) land management practices that are implemented in forests generally result in depletion of SOC, and (iii) indirect effects of climate change, such as through wildfires, have a greater impact on SOC than direct climate change effects (e.g., from rising temperatures). The findings of our study provide strong evidence to assist decision-makers in safeguarding SOC stocks and promoting landmanagement practices for SOC restoration. Furthermore, they serve as a crucial research roadmap, identifying areas that require attention to fill the knowledge gaps concerning the factors driving changes in SOC.

Mots-clés libres : Soil carbon, 4 pour 1000, Meta-analysis

Agences de financement européennes : European Commission

Programme de financement européen : Horizon Europe

Projets sur financement : (EU) Operationalising the International Research Cooperation on Soil Carbon

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