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Effect of different additions of low-density polyethylene and microplastics polyadipate/butylene terephthalate on soil bacterial community structure
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Researchers compared the effects of biodegradable PBAT microplastics and traditional LDPE microplastics on soil bacterial communities. The study found that PBAT significantly altered soil nutrient levels and bacterial community structure in a dose-dependent manner, with low additions increasing microbial richness while higher amounts reduced it. Evidence indicates that PBAT microplastics may disrupt soil carbon-nitrogen cycling and affect key processes like nitrogen fixation and phosphorus availability.
The stress produced from biodegradable plastics on soil ecosystem is a rising global concern. However, effects of such microplastics (MPs) on soil ecology are still debatable. In this study, the biodegradable microplastic PBAT (polyadipate/butylene terephthalate) was used as the target object, compared with the traditional microplastic LDPE (low-density polyethylene). A pot experiment and was high-throughput sequencing analysis used to determine the effect of different additions of MPs on soil bacterial community structure and the correlation between soil bacterial community structure and chemical properties was investigated. Compared with LDPE, the results showed that EC, TN, TP, NH-N, and NO-N changed obviously with the increasing of PBAT addition (p < 0.05), but pH changed little and the community richness was significantly higher in soils with low PBAT addition than that with higher PBAT addition. PBAT is beneficial to soil nitrogen fixation, but it will significantly reduce the soil P content and affect the nitrification and denitrification reaction. It suggested that addition of PBAT MPs and its addition amount result in changes in soil fertility, community abundance, and structure and composition of bacterial communities in soil samples, while the presence of PBAT MPs might affect soil carbon-nitrogen cycle.
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Soil C-N and microbial community were altered by polybutylene adipate terephthalate microplastics
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Researchers investigated how biodegradable polybutylene adipate terephthalate (PBAT) microplastics affect soil carbon, nitrogen, and microbial communities in soils planted with soybean and maize. The study found that PBAT microplastics significantly altered dissolved organic carbon and nitrogen levels, increased microbial biomass, and shifted bacterial and fungal community composition, suggesting that even biodegradable microplastics may disrupt soil nutrient cycling in plant-specific ways.
Effect of LDPE and biodegradable PBAT primary microplastics on bacterial community after four months of soil incubation
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Researchers compared the effects of conventional polyethylene (LDPE) and biodegradable PBAT microplastics on soil bacterial communities over four months. They found that both types of microplastics altered soil microbial community composition, but PBAT had a more pronounced effect due to its biodegradability providing additional carbon sources. The study suggests that biodegradable plastics are not necessarily safer for soil ecosystems than conventional plastics.
Molecular insights into effects of PBAT microplastics on latosol microbial diversity and DOM chemodiversity
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Researchers found that biodegradable PBAT microplastics significantly altered soil microbial community diversity and dissolved organic matter composition in tropical latosol over 120 days, with effects intensifying at higher microplastic concentrations.
Dosages of Biodegradable Poly(butylene adipate-co-terephthalate) Microplastics Affect Soil Microbial Community, Function, and Metabolome in Plant–Soil System
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Researchers examined how different concentrations of biodegradable PBAT microplastics affect soil microbial communities and lettuce growth. They found that while low concentrations had minimal impact, higher doses significantly altered soil microbial diversity, metabolic functions, and the chemical profile of the soil. The findings suggest that even biodegradable plastic mulch residues can disrupt soil ecosystems when they accumulate at higher levels.
Negative effects of poly(butylene adipate-co-terephthalate) microplastics on Arabidopsis and its root-associated microbiome
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Researchers found that the biodegradable plastic PBAT had greater inhibitory effects on Arabidopsis growth than conventional LDPE microplastics, disrupting photosynthesis and altering root-associated microbial communities in ways that suggest biodegradable plastics are not necessarily safer for soil ecosystems.
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