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The distribution and characteristics of soil microplastics pollution: Evidences from different land use
Summary
Scientists tested soil from farmland, tree plantations, roadside greenery, and forests in a mountainous region of China, finding that plantations and roadside soil had far more tiny plastic bits than natural forest soil, likely from plastic mulch, fertilizers, and traffic pollution. Since these microplastics can work their way into crops, groundwater, and eventually our food and water supply, understanding where they build up most helps identify where cleanup and prevention efforts (like reducing plastic mulch use) would make the biggest difference for both soil health and human exposure.
Microplastic pollution in terrestrial ecosystems is a global concern, yet its distribution across land-use types remains poorly understood in plateau regions. To investigate the distribution of microplastics (MPs) across land-use types, 86 soil samples were collected from four land-use types in Yunnan Province: dryland farmland (DF), plantation (P), road greenbelt (RG), and forest (F). MPs abundance was significantly higher in P (6211 ± 6580 items kg) and RG (5728 ± 4392 items kg) soils than in F (1650 ± 917 items kg) (P < 0.05), with DF soils at intermediate levels (3042 ± 2442 items kg). Effect size analysis (η² = 0.124 for 0-5 cm; η² = 0.152 for 5-10 cm) indicated that land-use type explains approximately 12-15% of the total variation in MPs abundance. The majority of microplastics were 0-0.5 mm; amongst the extractable microplastics, polyethylene (PE) and polypropylene (PP) are the predominant types. Soil MPs abundance in DF increased with mulching duration (within 0-25 years). In P soils, MPs abundance was significantly higher with organic than chemical fertilizer (P < 0.05). In RG soils, MP abundance from medium-sized cities was significantly higher than that in small cities. These findings provide critical insights for targeted mitigation strategies to safeguard soil quality and ecosystem health in plateau regions.