Summary
This field study examined how residual microplastic films in farmland soils create a unique microhabitat—the 'plastisphere'—that develops distinct microbial communities and functions compared to bulk soil. Metagenomic analysis revealed that the plastisphere acts as a preferred vector for pathogenic and plastic-degrading microorganisms, and displays substantially higher abundance of genes mediating nitrogen and sulphur cycling, potentially increasing nutrient loss risk. The findings suggest residual plastic mulch has significant negative consequences for soil microbiota structure and biogeochemical processes in farmland agroecosystems.
UK applicability
The findings are relevant to UK agriculture insofar as plastic mulch films are used in horticulture and some arable systems, though their prevalence and field-life differ between regions. The documented shifts in microbial assembly and increased denitrification gene abundance could inform best practice for plastic film management and soil remediation in UK farming, particularly in regions with intensive plastic mulch use.
Key measures
16S rRNA gene and ITS amplicon sequencing; metagenome analysis; microbial community structure; stochastic vs. deterministic assembly processes; abundance of denitrification and sulfate reduction genes
Outcomes reported
The study characterised microbial community structure, assembly processes, and biogeochemical function in the plastisphere (microplastic film surface) versus bulk soil across 33 farmland sites using amplicon sequencing and metagenomic analysis. Residual microplastic film was found to create a distinct microbial niche with altered assembly dynamics and elevated genes associated with denitrification and sulfate reduction.
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