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The bridging role of soil organic carbon in regulating bacterial community by microplastic pollution: Evidence from different microplastic additions
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This study tested how three common microplastics -- polyethylene, polystyrene, and PVC -- affect soil health when present at realistic concentrations. All three types changed the soil's chemistry and shifted the balance of bacterial communities, which matters because these same soil changes can affect the crops we grow and the food chain that ultimately impacts human health.
The serious threat posed by microplastics pollution to soil ecosystems and human health has attracted worldwide attention. Microplastics of different types are present in the soil environment, whereas research about the effects of different microplastics on soil ecology are limited. This study sought to determine how three common microplastics (polyethylene (PE), polystyrene (PS), and polyvinyl chloride (PVC)) affect soil physicochemical characteristics, enzyme activities, bacterial community, and their metabolic pathways at a 1 % w/w concentration. All three microplastic treatments significantly increased soil organic carbon (SOC), labile organic C fractions, and enhanced soil carbon to nitrogen ratio. PE, PS, and PVC microplastics exhibited promotion of α-glucosidase (α-GC), sucrase (SC), and alkaline phosphatase (AKP) activities. PS microplastics caused a significant increase in N-acetyl-β-D-glucosidase (NAG) and leucine aminopeptidase (LAP) activities, while PVC microplastics significantly decreased β-glucosidase (β-GC) activity. Microplastic treatments increased the bacterial community diversity while altering its composition. Proteobacteria and Chloroflexi were the dominant bacterial phyla in the soil, with microplastic treatments increasing the relative abundance of Chloroflexi and decreasing that of Proteobacteria. Functional prediction analysis indicated that microplastic treatments enriched genes involved in carbohydrate and amino acid metabolism, while reducing the abundance of genes related to signal transduction and cell motility. Correlation and pathway analyses revealed that microplastics affect bacterial community diversity and composition through direct and indirect effects (by acting on SOC or its key labile fractions), thereby influencing soil enzyme activities. In conclusion, the work emphasizes the impacts of different microplastics on soil ecosystems in terms of commonalities and dissimilarities, with the innovative finding of indirect regulation of bacterial community by SOC under microplastics contamination. This provides new perspectives for subsequent studies.
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Researchers compared microplastic effects on soil organic matter dynamics and bacterial communities across contrasting soil environments, finding that the type of microplastic polymer and soil conditions together determine whether microbial activity and carbon cycling are stimulated or suppressed.
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Soil microplastics pollution can reduce viral abundance and have less consistent impacts on bacteria
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Researchers exposed soils containing natural microbial communities to polyethylene and PVC microplastics and found that both types consistently reduced viral abundance, while effects on bacteria were more variable, suggesting microplastic pollution may alter the balance of microbial communities that regulate soil processes.
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Researchers conducted a meta-analysis examining how plastic residues, including microplastics, affect soil microbial communities. The study found that plastics accelerated soil organic carbon loss and reduced microbial biomass overall, with effects varying by polymer type: polyethylene decreased microbial richness while polypropylene increased it, and the impact on microbial activity followed a dose-response pattern with a turning point around 40 grams per kilogram of soil.
Time-dependent effects of microplastics on soil bacteriome
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Researchers studied how six common types of microplastics affect soil bacteria over time at realistic contamination levels. The effects were slow to appear due to the chemical stability of plastics, but over time, microplastics altered bacterial community structure and soil functions in ways that differed by plastic type. This matters because changes to soil bacteria can affect nutrient cycling and crop health, with potential downstream effects on food quality.
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