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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.
The impact of biodegradable microplastics on the microbial community and dissolved organic matter (DOM) in latosol has not been well reported. In this study, an incubation experiment at 25 ºC for 120 days using latosol amended with low (5%) and high (10%) concentrations of polybutylene adipate terephthalate (PBAT) microplastics was carried out to explore the impacts of PBAT microplastics on soil microbial communities and DOM chemodiversity, and the intrinsic interactions between their shifts. The main bacterial and fungal phyla in soil, namely Chloroflexi, Actinobacteria, Chytridiomycota, and Rozellomycota showed a nonlinear relationship with PBAT concentration and played a pivotal role in shaping DOM chemodiversity. A higher decreased levels of lignin-like compounds and increased levels of protein-like and condensed aromatic compounds in the 5% treatment were observed than that in the 10% treatment. Furthermore, a higher increase relative abundance of CHO compounds in the 5% treatment than in the 10% treatment was ascribed to its higher oxidation degree. Co-occurrence network analysis suggested that bacteria formed more complex relationships with DOM molecules than fungi did, indicating their critical roles in DOM transformation. Our study has important implications for understanding the potential influence of biodegradable microplastics on carbon biogeochemical roles in soil.
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Addition of biodegradable microplastics alters the quantity and chemodiversity of dissolved organic matter in latosol
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Researchers found that adding biodegradable PBAT microplastics to tropical soil increased microbial and enzyme activity, which in turn altered the quantity and chemical diversity of dissolved organic matter, suggesting biodegradable plastics still significantly affect soil biogeochemistry.
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.
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A 310-day soil incubation experiment found that polyethylene, polystyrene, and PVC microplastics reduced aromatic and hydrophobic dissolved organic matter (DOM) components by over 20%, decreased DOM humification levels, and shifted microbial communities in ways that altered nitrogen availability. These changes in soil DOM chemistry and microbial structure have downstream implications for soil fertility, greenhouse gas emissions, and the bioavailability of co-contaminants like heavy metals and antibiotics.
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.
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