Research Progress on Migration Mechanism and Toxic Effects of Micro-and Nanoplastics in Soil Plant System
Microplastics are plastic debris and particles with a particle size of less than 5 mm,of which a particle size of less than 100 nm is considered nanoplastic.As an emerging pollutant,micro-and nanoplastics(MNPs)are difficult to degrade,prone to accumulation,and can be transported over long distances,with significant ecological impacts.However,compared with other environments,the knowledge and understanding of MNPs in the soil eco-systems is still relatively low.Therefore,this article discusses in detail the biotic and abiotic transport processes and mechanisms of MNPs in the soil environment and systematically summarizes the transfer process of MNPs from soil to plants.The direct toxic effects of micro-and nanoplastics on plant seed germination and root development,as well as indirect toxic effects on plants by altering soil physicochemical properties and by adsorbing heavy metals and organic pollutants and thus acting as pollutant transport carriers,have also been explored.Finally,the problems of MNPs contamination in soil-plant systems that need to be further studied and dealt with are presented.This pa-per can provide a scientific reference for the ecological risk assessment of MNPs pollution in soil-plant systems.
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