本文轉錄自https://biochartoday.com/2025/01/19/the-role-of-biochar-in-erosion-control-benefits-and-limitations/

Soil erosion is a major environmental concern that affects agricultural productivity and ecosystem health. A recent study explored the effects of biochar, a carbon-rich soil amendment, on erosion-prone silty sand soils. Produced from corn cobs using pyrolysis, biochar is known for improving soil properties like water retention. However, its role in reducing soil erosion is less clear.

The study found that while biochar enhances the water retention capacity of soils—raising the liquid and plastic limits by 8-10%—it can increase soil erosion when used alone. This is likely due to biochar’s lightweight, porous structure, which can destabilize soil aggregates in the absence of supporting mechanisms. Erosion resistance was tested using a submerged jet erosion method.

Crucially, when biochar was combined with erosion control blankets (ECBs) and vegetation like ruzi grass, erosion decreased significantly—up to 39% compared to untreated soil. ECBs, made from materials like coconut fiber, provided structural stability during the early stages of vegetation growth, when root reinforcement was minimal. Compost incubation also improved soil structure and microbial activity, but its impact was limited without ECBs.

The findings highlight the importance of integrating biochar with other erosion control measures rather than relying on it as a standalone solution. While promising for soil stabilization on slopes, the approach may require adaptation for different soil types or climates. These insights are valuable for sustainable infrastructure and land management in erosion-prone regions.

Hossain, et al (2025) Increased erosion in biochar-amended soil: importance of integrating erosion control blankets and vegetation. Biogeotechnics. https://doi.org/10.1016/j.bgtech.2025.100161