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Bacterial communities on soil microplastic at Guiyu, an E-Waste dismantling zone of China
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Researchers characterized bacterial communities colonizing soil microplastics at Guiyu, China — a major e-waste dismantling zone — using high-throughput sequencing, finding that microplastic-associated bacterial communities differed significantly from surrounding soil communities and varied with the type of e-waste dismantling activity.
Recent studies of microplastic have focused on aquatic environment, but its impacts on soil ecosystems were poorly understood, particularly on bacterial communities. In this study, the bacterial taxon and functional composition of soil microplastic-attached communities at Guiyu, a notorious e-waste dismantling area in Guangdong Province, China, were investigated by means of high-throughput sequencing. The results revealed that fundamental difference in bacterial communities existed among microplastics selected from three plots with different dismantling methods and their surroundings, suggesting that microplastic surface created a new ecological niche in soil environment, and the bacteria adapted well to the surface-related lifestyle. The formation of microplastic-attached bacteria depended not only on various dismantled plastic materials, but also on disassembly methods that caused different soil physicochemical characters which might also influence the bacterial communities. As the hydrocarbon degraders, the family Hyphomonadaceae were also found on soil microplastic, further confirming that microorganisms played a role in biodegrading microplastic in e-waste zone. The analysis of functional profiles speculated that microplastic-attached bacteria had the potential to degrade pollutants. This study provides a new perspective for exploring microplastic-associated bacteria and increasing our understanding of microplastic pollution in terrestrial ecosystems.
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