The Combined Pollution Mechanism of Microplastics and Heavy Metals in the Soil and Physiological Effects on Plants:A Review
Microplastics could adsorb heavy metals and form combined pollution in the soil,thereby altering the environmental behavior of a single pollutant,which affects plant growth.Here,the mechanism and impact fac-tors of the combined pollution of microplastics and heavy metals in the soil and its physiological effects on plants were reviewed comprehensively.Microplastics in the soil could be used as carriers to adsorb heavy metals,affect their bioavailability,and change the migration behavior of heavy metals in the soil-plant system.And the process is related to the type,morphology,particle size,and aging of microplastics,as well as the type,concentration,and bioavailability of heavy metals.Microplastics and heavy metals in the soil can adsorb onto the plant surface or enter the plant body,affect the plant growth,alter the photosynthetic intensity,induce the oxidative stress and antioxi-dant active enzyme changes,and affect the plant metabolism and nutrient absorption.Meanwhile,microplastics and heavy metals enriched in plants can migrate along the food chain,and further threaten human health.Finally,fu-ture research of the combined pollution of microplastics and heavy metals in the soil is prospected to provide refer-ences for the subsequent research.
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