In-Depth Analysis of Soil Microbial Community Succession Model Construction under Microplastics Stress

Although microplastics (MPs) toxicity to soil microorganisms has been preliminarily explored, the underlying reasons affecting the direction of microbial community succession are unclear. This study aimed to investigate the impacts of MPs infer community assembly mechanisms through phylogenetic bin-based null model analysis, network models, and protein function prediction in five typical Northeast China five typical soils. The results show that microbial communities in soils with high organic matter exhibit a stronger response to MPs, with enhanced protein functionality, network regulation, and assembly processes. The presence of MPs increased the drift process in the soil microbial community assembly by 2%, a deterministic process influenced by MPs, and enhanced the complexity and stability of the community assembly. Overall, MPs altered microbial protein function and regulatory networks by affecting diversity and community assembly processes, leading to shifts in microbial community succession. This study provided a theoretical basis for further study of the ecotoxicological effects of MPs in soil.