The Effect of Biochar on Saline-alkali soil Amelioration and its Carbon Sequestration and Emission Reduction Effects

[Geoengineering News]

https://link.springer.com/article/10.1007/s42729-026-03277-7

Authors: Xingyao Meng, Liuxia Li, Hanjie Yang, Zifan Huang, Jinglin Li, Pan Wang & Lianhai Ren 

25 April 2026

Abstract

Biochar, a carbon-rich porous material derived from biomass, holds significant potential for saline-alkali soil remediation and carbon sequestration. To address gaps in existing reviews regarding feedstock-soil type matching effects and the synergistic mechanisms between soil improvement and carbon sequestration, this review systematically elucidates the multi-pathway remediation mechanisms of biochar. These include improving soil physicochemical properties, promoting plant growth, regulating microbe-driven nutrient cycles, and influencing salt transport and transformation processes. Furthermore, we emphasize the dual role of biochar in carbon management: direct carbon sequestration via its recalcitrant aromatic structure and indirect emission reduction through suppressing N₂O and CH₄ fluxes, thereby establishing an integrated“amendment-sequestration” pathway. Finally, we outline targeted future research directions, including precision modification of biochar, long-term stability assessment under saline-alkali conditions, and lifecycle risk evaluation, to advance the scientific application of biochar in sustainable agricultural systems.

Source: Springer Nature Link