Technical analysis and prospect of ornamental plant remediation of urban lead-contaminated soil
The issue of soil contamination by heavy metal lead(Pb)poses threats to the ecological functioning of urban soil and human health,and it is of great significance to carry out remediation of urban lead-contaminated soil.Compared to the limitations of physical and chemical remediation methods,the utilization of ornamental plants for the remediation of urban lead-contaminated soil can achieve soil lead reduction and restore soil ecological functions while also providing good landscape effects,and thus it is more suitable for the remediation and treatment of urban lead-contaminated soil.This article discusses the mechanisms and influencing factors of phytoremediation for lead-contaminated soil,and analyzes the advantages of ornamental plants as lead-accumulating plants,as well as potential issues such as weak growth vigor and low lead extraction efficiency in the remediation of urban lead-contaminated soil.To further enhance the effectiveness of phytoremediation,the major advantages,disadvantages,and application methods of ornamental plant combined remediation technologies for lead-contaminated soil are compared from four aspects,namely plant-nanomaterial,plant-chemical agent,plant-microorganism,and plant-genetic engineering.This article outlines the challenges and future research directions of ornamental plant remediation technologies for urban lead-contaminated soil,and proposes suggestions for screening and improving hyperaccumulator ornamental plants using molecular breeding technologies,developing combined remediation technologies,and exploring synergistic remediation mechanisms to achieve sustainable remediation of urban lead-contaminated soil;in addition,efforts should be intensified in conducting on-site remediation and creating successful remediation cases to provide scientific evidence for the remediation of urban lead-contaminated soil.
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维普
