Summary
This systematic review examines biochar as a soil amendment for restoring degraded soils and enhancing productivity. The authors synthesise evidence on biochar's physicochemical properties—particularly high cation exchange capacity, porosity, and specific surface area—and their effects on soil function across acid, saline/sodic, and contaminated soils. The review concludes that whilst biochar shows promise for soil remediation and carbon sequestration, robust long-term field research is needed to validate findings and guide targeted, sustainable applications.
UK applicability
Findings are potentially relevant to UK soil remediation priorities, particularly for acidic soils common in upland regions and contaminated brownfield sites. However, UK-specific field validation would be required to establish optimal biochar types, application rates, and persistence in temperate climates and under UK rainfall patterns.
Key measures
Soil pH, water-holding capacity, aeration, soil microbial community composition and function, carbon availability, nutrient availability, cation exchange capacity, sorption capacity, soil remediation outcomes across different soil degradation types
Outcomes reported
The systematic review synthesises evidence on biochar's effects on soil pH, water-holding capacity, aeration, microbial communities, and carbon and nutrient availability across multiple soil types. It evaluates biochar performance in acid, saline/sodic, and heavy metal-contaminated soils, identifying conditions where application is most effective.
Topic tags
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