With the increase in highway mileage and the development of the highway network,highway traffic has be-come a major source of heavy metal contamination in the soil on both sides of the highway.Due to the small amount of arable land per capita in China,there is still a lot of farmland and various crops on both sides of the road.Re-search showed that highway traffic had caused different degrees of pollution to farmland and crops on both sides of the highway,which posed a great threat to the quality and safety of agricultural products.In this paper,the status of heavy metal pollution in farmland soil and crops along the highway and the relationship between them were systemati-cally reviewed,and the factors affecting the spatial distribution of heavy metals in soil along the highsway were thor-oughly analyzed.Finally,the perspective of the research direction of heavy metal pollution in farmland along the highway was proposed,to provide ideas and directions for the prevention and control of heavy metal pollution in farm-land soil along the highway.
farmland soilcrophighwayheavy metal pollutionspatial distribution
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