土壤侵蚀对重金属迁移的作用规律与机制研究进展OACSTPCD

[Objective]The aims of this study are to reveal the migration rule of heavy metals under soil ero-sion,clarify the migration mechanism of heavy metals under soil erosion,and provide scientific guidance for the prevention and control of heavy metal pollution.[Methods]Based on the domestic and foreign articles on the migration of heavy metals under soil erosion,the role of soil erosion on the migration of heavy metals was systematically summarized from three aspects:soil properties,heavy metal properties,and environmen-tal factors.[Results](1)Under erosion,the soil heavy metals mainly migrate horizontally and vertically in the form of particles,and the dissolved heavy metals account for a small proportion but have strong activity.The sediment characteristics of the sediment area caused by erosion are different from those of the soil in the erosion area,which may affect the spatial distribution pattern of heavy metal enrichment characteristics.(2)The higher the soil pH,organic matter,and clay content,the stronger the ability to adsorb heavy metals,and the weaker the ability of heavy metals to be released and migrated.(3)The speciation of heavy metals in soil plays an important role in their migration form.Generally,dissolved heavy metals mainly come from the available form,while relatively stable residual forms usually migrate in the particulate form.(4)Environmental factors such as rainfall,terrain,and vegetation affect the migration process of sediment particles,and prioritize the migration of fine particles,resulting in a certain variation pattern of sediment particle size distribution along the migration path.[Conclusion]Heavy metal migration under erosion is af-fected by soil/heavy metal properties and environmental factors.Future research can focus on:the impact of soil erosion on the migration process of heavy metals under different geological backgrounds and pollution causes;study on the heterogeneity of heavy metal speciation in soil particles with different particle sizes;the mechanism of underground leakage in karst areas on the migration of heavy metals,and the distribution mechanism of heavy metal surface loss and underground leakage under different erosion conditions.