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Growth, Root, Photosynthetic, and Soil Responses of Poplar Seedlings to an Equal-Mass PVC–PE–PS Microplastic Mixture
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Scientists found that when tree seedlings grew in soil with moderate-to-high levels of mixed microplastics (a blend of common plastic types like PVC and PE), the plants had stunted roots, weaker photosynthesis, and more cell damage, plus the soil itself lost some of its nutrient and enzyme health. This matters because it shows microplastic pollution isn't just a concern for oceans and animals, it can also weaken the soil and trees we rely on for reforestation and clean air, which ultimately ties back to the broader environmental systems that support human health.
Soil microplastic pollution may affect woody plant establishment, but evidence for tree seedlings remains limited. Populus simonii × P. nigra ‘1307’ seedlings were grown for 45 d in soil containing an equal-mass PVC–PE–PS mixture at 0, 100, 500, or 1000 mg kg−1 dry soil. Growth, root architecture and activity, photosynthetic traits, oxidative status, and soil chemical and enzymatic properties were measured. The 100 mg kg−1 treatment produced limited, trait-specific changes and did not consistently inhibit growth. In contrast, 500 and 1000 mg kg−1 reduced most growth and physiological traits. At 1000 mg kg−1, total dry biomass, total root length, root surface area, root volume, root-tip number, and root activity decreased by 43.7%, 46.5%, 47.2%, 50.2%, 51.1%, and 50.9%, respectively. Net photosynthetic rate and PSII electron transport declined, whereas H2O2, O2•− production, thiobarbituric acid-reactive substances (TBARS), and electrolyte leakage increased. Under higher exposure, soil electrical conductivity was higher, whereas available nutrient levels and several soil enzyme activities were lower. These results indicate that medium and high concentrations of the tested mixture were associated with concurrent inhibition of root development, photosynthetic performance, and biomass accumulation under short-term pot conditions. Because concurrent impairment of woody-seedling performance and soil biochemical functioning may compromise vegetation establishment, these findings support the inclusion of mixed-polymer exposure in ecological risk assessments for soils used in forestry and ecological restoration.
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Scientists studied how tiny plastic particles (microplastics) affect forest soil when combined with warming temperatures, and found that these plastics disrupt how soil processes carbon and nitrogen - key nutrients that keep ecosystems healthy. The plastic pollution made soils more sensitive to temperature changes and altered important chemical cycles that plants depend on for growth. This matters because microplastics are everywhere in our environment, and this research shows they could harm the forest ecosystems that clean our air and water, especially as the planet continues to warm.
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