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Reductive soil disinfestation influences microbial aging of low-density polyethylene and polyhydroxyalkanoate microplastics and microbial communities in plastispheres

Journal of Environmental Management 2024 4 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Jiahe Miao, Fenghe Wang Jining Li, Wen Li, Fenghe Wang, Yining Zhu, Yining Zhu, Ruijie Che, Ruijie Che, Xinyan Zong, Fenghe Wang, Haiyan Fu, Yicheng Wu, Jining Li, Ruijie Che, Xinyan Zong, Fenghe Wang Jining Li, Wen Li, Haiyan Fu, Fenghe Wang, Ruijie Che, Wen Li, Ruijie Che, Fenghe Wang, Fenghe Wang Fenghe Wang Jining Li, Xinyan Zong, Ruijie Che, Wen Li, Xinyan Zong, Jining Li, Ruijie Che, Jining Li, Fenghe Wang Jining Li, Fenghe Wang Fenghe Wang Fenghe Wang Fenghe Wang Fenghe Wang, Fenghe Wang, Fenghe Wang, Fenghe Wang, Fenghe Wang, Fenghe Wang Fenghe Wang, Fenghe Wang Yicheng Wu, Yicheng Wu, Fenghe Wang, Haiyan Fu, Fenghe Wang

Summary

Researchers examined how a soil treatment method called reductive soil disinfestation affects the breakdown of conventional and biodegradable microplastics in agricultural soil. They found that the treatment slowed the degradation of conventional polyethylene microplastics but accelerated the breakdown of biodegradable polyhydroxyalkanoate plastics. The study reveals that soil management practices can significantly influence how long different types of microplastics persist in farmland.

Polymers

LDPE PE

The extensive use of plastic products has led to the accumulation of microplastics (MPs) in agricultural soils, raising concerns about their fate in various environments. Reductive soil disinfestation (RSD) treatment is increasingly being adopted in various countries to address agricultural soil health issues. However, the treatment can alter the soil microbial environment, potentially affecting the fate of contaminants, including MPs. The effect of RSD on the aging of low-density polyethylene (LDPE) and polyhydroxyalkanoates (PHA) MPs was studied through an incubation experiment. The mechanism involved was further investigated by microbial community analysis. The characterization results shown that RSD treatment inhibited the aging of LDPE but promoted the aging of PHA. The results indicated that RSD reshaped the microbial community and reduced the relative abundance of lipid metabolism in the LDPE plastisphere, thereby hindering LDPE aging. Predicted functional genes in the plastispheres were primarily involved in metabolism (77.15-87.48%) and genetic information processing (8.774-12.62%). The enrichment of bacteria related to poly(3-hydroxybutyrate) depolymerase (phaZ) in the PHA plastisphere explained the higher aging degree of PHA during RSD. Some fungus also involved in the MPs aging, while some fungus pathogens can proliferate in the MPs plastispheres. The 3DEEM analysis indicated that PHA MPs aging increased tyrosine-like substances in soil extracts. These findings provide new insights into the ecological implications of RSD and enhance our understanding of microbial communities within plastispheres.

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