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Forest soils accumulate microplastics through atmospheric deposition
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Researchers quantified microplastics in forest soil layers and atmospheric throughfall deposition to understand how microplastics accumulate in forest ecosystems. They found that microplastics initially enriched in decomposed litter layers before accumulating in deeper mineral soil through natural litter turnover processes. The study suggests that forests act as good indicators of atmospheric microplastic pollution, with most forest soil microplastics originating from atmospheric deposition rather than other sources.
Abstract The occurrence and fate of microplastics in forest ecosystems is a recognized knowledge gap. In this paper, we used an aligned extraction method to quantify microplastics (>20 µm) in organic and mineral forest soil horizons and throughfall deposition. Calculation of forest soil microplastic stocks and throughfall fluxes allowed an estimation of throughfall contribution to microplastic accumulation in forest soils back to 1950. We identified a short-term microplastic enrichment in decomposed litter horizons followed by an accumulation in lower mineral soil caused by litter turnover processes. Similar microplastic features in soil and throughfall deposition indicate that microplastics entering forest soils primarily originate from atmospheric deposition and litter fall, while other sources have a minor impact. We conclude that forests are good indicators for atmospheric microplastic pollution and that high microplastic concentrations in forest soils indicate a high diffuse input of microplastics into these ecosystems.
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This review examines microplastic pollution in forest ecosystems, discussing sources including atmospheric deposition and agricultural runoff, mechanisms of migration through soil and water, impacts on forest biodiversity and soil health, and potential mitigation strategies.
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Researchers explored how microplastics affect soil respiration in forests of different ages by altering microbial community structure and carbon metabolism. The study found microplastic levels ranging from approximately 600 to 3,858 items per sample across forest ages, and that their presence indirectly influences soil carbon cycling processes.
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Researchers examined the underappreciated role of forest soils as a global sink for micro- and nanoplastics, noting that forest canopies can intercept airborne plastic particles that then accumulate in the soil below. Despite covering a third of Earth's land surface, forest soil plastic pollution remains largely unstudied, leaving a major gap in understanding where environmental plastics ultimately end up.
Microplastic data on microplastics in forest soils
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Scientists tested forest soils in Germany and found that microplastic levels varied a lot from place to place, depending on things like soil chemistry and the type of forest growing there. This matters because forests aren't as untouched as we might think—tiny plastic particles are working their way into the ground beneath trees, and understanding what drives this buildup is a first step toward figuring out how these plastics might eventually reach our food and water supplies.
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Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.