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LDPE microplastics significantly alter the temporal turnover of soil microbial communities
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Soil amended with polyethylene microplastics showed a significantly faster rate of bacterial community succession over time compared to unamended controls, with community differences between plastic and control soils increasing linearly with incubation duration. The results suggest microplastics accelerate microbial turnover in terrestrial ecosystems, with potential consequences for soil stability and function.
Although the ubiquitous presence of microplastics in various environments is increasingly well studied, knowledge of the effects of microplastics on ambient microbial communities is still insufficient. To estimate the response of soil bacterial community succession and temporal turnover to microplastic amendment, a soil microcosm experiment was carried out with polyethylene microplastics. The soil samples under control and microplastic amendment conditions were collected for sequencing analysis using Illumina MiSeq technology. Microplastic amendment was found to significantly alter soil bacterial community structure, and the community differences were increased linearly with the incubation time. Compared with the turnover rate of bacterial community in the control samples (0.0103, p < .05, based on Bray-Curtis similarity), the succession rate was significantly (p < .001) higher in the soil with microplastic amendment (0.0309, p < .001). In addition, the effects of microplastic amendment on the time-decay relationships (TDRs) on taxonomic divisions revealed considerable variations of TDRs values, indicating the effects were lineage dependent. Our results propose that the presence of microbial in soil ecosystem may lead to a faster succession rate of soil bacterial community, which provides new insights into the evolutionary consequences of microplastics in terrestrial environment.
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LDPE microplastic films alter microbial community composition and enzymatic activities in soil
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Polyethylene microplastic films were added to soil at 2000 fragments/kg and effects on enzymatic activities and bacterial communities were measured over 90 days, with urease and catalase activities significantly increased after 15 days and alpha diversity of soil bacteria reduced. The study indicates that LDPE microplastics alter soil microbial function and community structure, with potential consequences for nutrient cycling.
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