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Effects of photoaging on structure and characteristics of biofilms on microplastic in soil: Biomass and microbial community
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Scientists studied how sunlight aging changes the way bacteria colonize microplastics in soil, finding that weathered plastics attracted different bacterial communities than fresh plastics. Aged microplastics initially supported less biofilm growth but developed bacteria with greater ability to break down carbon compounds. This research helps explain how microplastics behave differently in real-world soil conditions versus lab settings, which matters for understanding how plastics affect agricultural land and the food grown in it.
Understanding of the environmental behaviors of microplastics is limited by a lack of knowledge about how photoaging influences biofilm formation on microplastics in soil. Here, original microplastics (OMPs) and photoaged-microplastics (AMPs) were incubated in soil to study the effect of photoaging on formation and characteristics of biofilm on the poly (butylene succinate) microplastics. Because photoaging decreased the hydrophobicity of the microplastic, the biomass of biofilm on the OMPs was nearly twice that on the AMPs in the early stage of incubation. However, the significance of the substrate on biomass in the biofilm declined as the plastisphere developed. The bacterial communities in the plastisphere were distinct from, and less diverse than, those in surrounding soil. The dominant genera in the OMPs and AMPs plastispheres were Achromobacter and Burkholderia, respectively, indicating that photoaging changed the composition of the bacterial community of biofilm at the genus level. Meantime, photoaging decreased the complexity and stability of the plastisphere bacterial community network. Results of Biolog ECO-microplate assays and functional prediction from amplicons showed that photoaging treatment enhanced the carbon metabolic capacity of the microplastic biofilm. This study provides new insights into the formation of plastispheres in soil.
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UV Aging Strengthens the Effects of Polyvinyl Chloride Microplastics on Soil Bacterial Community Structure and Predicted Functional Profiles
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Sunlight breaks down plastic bits (like those from PVC pipes and packaging) that end up in soil, and this study found that "sun-aged" microplastics change soil bacteria communities more than fresh, unweathered plastic does—including a possible increase in bacteria linked to antibiotic resistance. Since soil bacteria play a key role in growing our food and keeping ecosystems healthy, this matters because most real-world plastic pollution has already been weathered by sunlight, so studying only "fresh" plastic may underestimate its true impact on the soil that feeds us.
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.
The Spatiotemporal Successions of Bacterial and Fungal Plastisphere Communities and Their Effects on Microplastic Degradation in Soil Ecosystems
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Researchers tracked how bacterial and fungal communities colonize microplastic surfaces in soil over time, finding that the surrounding soil type had the strongest influence on which microbes grew on the plastics. The microbial communities on microplastics were less diverse and less stable than those in the surrounding soil, but they attracted microbes with a higher capacity to break down organic carbon. The study suggests that microplastic surfaces become hotspots for carbon metabolism in soil ecosystems.
Tracking microplastics biodegradation through CO2 emission: Role of photoaging and mineral addition
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Researchers tracked biodegradation of fresh and photoaged microplastics in soil through CO2 emissions, finding that aged MPs mineralized at higher rates than pristine MPs due to greater surface oxidation and microbial colonization. Soil minerals further enhanced MP carbon mineralization, suggesting that mineral-rich soils can accelerate MP breakdown relative to sandy or low-mineral soils.
The Ultraviolet Irradiation Aging Characteristics of Microplastics in Soil under the Action of Biochar
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Researchers characterized how microplastics change physically and chemically under ultraviolet irradiation aging, documenting surface cracking, yellowing, and shifts in chemical functional groups. These aging signatures are important for understanding the environmental fate and increased toxicity of weathered microplastics.
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