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Human activity shapes the distribution and characteristics of microplastics in surface soils on three tropical islands in China
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Scientists studying soil on three tropical Chinese islands found that the more people live and work in an area, the more tiny plastic particles (microplastics) build up in the ground—islands with dense housing had over three times more plastic bits than untouched areas. Even islands with almost no residents weren't spared, since ocean currents carried plastic debris onto their shores. This matters because these plastics can enter the food chain through soil, plants, and animals, meaning our everyday waste and habits directly shape environmental plastic pollution, even in remote places we might assume are pristine.
Microplastics (MPs) in island environments are influenced by both local anthropogenic inputs and marine transport processes, yet comparative evidence for tropical island soils under contrasting disturbance regimes remains limited. In this study, surface soil samples were collected from Yongxing Island, Beigang Island, and Ganquan Island in Hainan Province, China, to investigate MPs abundance, morphology, particle-size distribution, and polymer composition. The results showed pronounced spatial heterogeneity among islands. Yongxing Island, characterized by concentrated residential activity, exhibited the highest MPs abundance, with a mean abundance of 0.64 items/g in residential areas, markedly higher than that in non-residential areas (0.18 items/g). Ganquan Island, which has almost no permanent residents, showed higher MPs abundance in nearshore soils (0.20 items/g) than in inland soils (0.10 items/g), indicating stronger marine influence. In contrast, Beigang Island exhibited lower overall abundance but h igher proportions of fibrous and medium-sized microplastics than the other two islands, likely associated with tourism, fisheries, and port-related activities. Polypropylene (PP) and polyethylene (PE) dominated on Yongxing Island, whereas engineering plastics, polyvinyl alcohol, and polyethylene terephthalate (PET) were more common on Beigang Island. Ganquan Island showed a more balanced composition including PE, PP, PET, and polyamide (PA). Overall, the abundance and characteristics of MPs across the three islands indicate that human activity intensity is a major determinant of soil MPs accumulation, while marine hydrodynamics and island environmental settings also play important roles in shaping spatial distribution patterns.
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