水土保持通报2024，Vol.44Issue(6)：222-236,15.DOI:10.13961/j.cnki.stbctb.2024.06.024
侵蚀—沉积对土壤重金属形态、浓度及富集影响的研究进展
Research Progress on Effects of Soil Erosion and Sedimentation on Form,Concentration and Enrichment of Heavy Metals
摘要
Abstract
[Objective]The effects of soil erosion and sedimentation on the form,concentration,and enrichment of heavy metals were explored,and the mechanism of the influence of soil erosion and sedimentation on the form,concentration and enrichment of heavy metals were studied,in order to provide a scientific basis for the prevention and control of soil heavy metal pollution in river basins.[Methods]Based on relevant domestic and foreign studies about the influence of erosion-deposition on soil heavy metals,CiteSpace and VOSveiwer software were used to study the knowledge map of the influence of soil heavy metals during erosion-deposition and the relevant research results were systematically analyzed.[Results]① The research on erosion-sedimentation and heavy metals has shown an upward trend in the past 30 years,increasing rapidly from 2017 to 2023,and geochemical characteristics,ecological risk assessment,source analysis,migration,and transformation are the hot spots in the research area.② During the erosion process,rainfall promoted the transformation of heavy metals from a granular state to a dissolved state,runoff led to the spatial differentiation of soil heavy metal content,and soil aggregate and clay content in the sedimentary environment affected the distribution and enrichment of heavy metals.③ Organic matter has dual effects on heavy metals:it can adsorb free heavy metal ions and reduce the exchange state content of heavy metals in soil.In addition,it can also have complexation with heavy metals and increase the organic binding state content of heavy metals.④ The pH value has a significant effect on the transformation of heavy metal forms.Under acidic conditions,the complexation and precipitation of heavy metal ions are promoted.In contrast,under alkaline conditions,the positive charge on the surface of soil particles repels the positive charge carried by heavy metal ions,thus affecting the adsorption of heavy metal ions on the surface of soil particles.⑤ Soil water affects the reduction and release of heavy metals.The higher the soil water,the greater the solubility of heavy metals,but excessive water will lead to insufficient oxygen and reduce the REDOX potential(Eh).The change of Eh directly affects the stability of iron and manganese oxides and sulfides in soil,causing changes in heavy metal concentration.[Conclusion]The occurrence forms,concentration changes,and enrichment characteristics of soil heavy metals during the erosion-deposition process are affected by various environmental factors,showing significant differences from erosion area to sedimentary area.Future studies should focus on the development of new technologies and new methods for monitoring the dynamic evolution of heavy metals during the erosion-deposition process.To provide more accurate strategies for the prevention and control of soil heavy metal pollution,a study on the internal relation mechanism of the occurrence form,concentration change,and enrichment characteristics of heavy metals during the erosion-sedimentation process and interaction effects of different factors on heavy metals during erosion-deposition should be conducted.关键词
土壤重金属/侵蚀和沉积/赋存形态/浓度变化/富集特征Key words
soil heavy metals/erosion and sed sedimentation/occurrence form/concentration change/enrichment characteristics分类
农业科技引用本文复制引用
张峰,陈佳,范萍萍,牛勇,方怒放,吴泽燕,谭廷俊,龙文涛,邰良..侵蚀—沉积对土壤重金属形态、浓度及富集影响的研究进展[J].水土保持通报,2024,44(6):222-236,15.基金项目
国家自然科学基金项目"喀斯特地质高背景区坡耕地土壤侵蚀对Cd迁移的作用机制"(42367047) （42367047）
自然资源部岩溶生态系统与石漠化治理重点实验室开放基金专项/广西岩溶动力学重大科技创新基地开放课题"喀斯特区浅层岩溶裂隙土壤漏失对Cd迁移的影响机制"(YRSW-2023-086) （YRSW-2023-086）
中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室基金"地球化学异常区坡耕地地表/地下土壤侵蚀对镉迁移的影响规律"(F2010121002-202416) （F2010121002-202416）
