Soil surface erosion is a common natural phenomenon, considerably leading to land degeneration and environment deterioration. In this study, microbially induced calcium carbonate precipitation (MICP), a green and sustainable bio-mediated technique to stabilize soils, has been proposed as a promising solution to control surface erosion of the clayey soils. Clayey soil samples with different sand additions (0, 10, 20, 30, 40%, w/w) were used to construct slope models. Five groups of soil slope model samples were treated with MICP by the surface spraying method. Another group of samples treated with deionized water was also prepared for comparison. Subsequently, a series of simulated rainfall erosion tests were conducted on these models for which the dip angle is 45°. Results that include the erosion pattern, the weight and rate of the soil loss, and outflow properties revealed that the MICP treatment is effective for controlling the surface erosion of the clayey soils. The microstructural characteristics of the samples of the treated soils, obtained from the scanning electron microscopy (SEM) indicate that the improvement in the erosion resistance can primally be attributed to the protective dense surface crust, mainly calcium carbonate, that gets formed. This layer is responsible for the enhanced water stability and mechanical strength of the topsoil. It has also been observed that with an increase in the sand content added to the clayey soil, the effectiveness of MICP treatment on controlling soil erosion gets further enhanced due to an increased MICP treatment depth and a more stable soil microstructure.

土壤表层侵蚀是一种常见的自然现象，严重导致土地退化和环境恶化。在这项研究中，微生物诱导碳酸钙沉淀 (MICP) 是一种绿色且可持续的生物介导的土壤稳定技术，已被提出作为控制粘质土壤表面侵蚀的有前途的解决方案。具有不同砂添加量 (0, 10, 20, 30, 40%, w/w) 用于构建斜率模型。5组土壤坡度模型样品采用面喷法进行MICP处理。另一组用去离子水处理过的样品也准备进行比较。随后，对这些倾角为45°的模型进行了一系列模拟降雨侵蚀试验。包括侵蚀模式、土壤流失的重量和速率以及流出特性在内的结果表明，MICP 处理可有效控制粘质土壤的表面侵蚀。从扫描电子显微镜 (SEM) 获得的处理土壤样品的微观结构特征表明，抗侵蚀性的提高主要归因于形成的保护性致密表层外壳，主要是碳酸钙。该层负责增强表土的水稳定性和机械强度。还观察到，随着添加到粘土中的沙子含量的增加，由于 MICP 处理深度的增加和更稳定的土壤微观结构，MICP 处理控制土壤侵蚀的有效性进一步增强。