Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 13, 2024

Soil microplastics (MPs) pollution has garnered considerable attention in recent years. The use of biodegradable plastics for mulching led to significant quantities plastic entering agro-ecosystems. However, the effects polylactic acid (PLA) on meadow soils remain underexplored. This study investigates impacts PLA varying particle sizes and concentrations soil physicochemical properties, enzyme activities, microbial communities through a 60-day incubation experiment. PLA-MPs increased pH, organic matter (SOM), total nitrogen (TN) available potassium (AK) content, as well enhanced activities superoxide dismutase (S-SOD), peroxidase (S-POD), catalase (S-CAT), β-glucosidase(S-β-GC) urease (S-UE) activities. Conversely, decrease alkaline phosphatase (S-ALP) activity was observed. influence properties more pronounced with larger sizes, whereas smaller particles had greater effect Additionally, an increase abundance Acidobacteriota, Chloroflexi, Gemmatimonadota, while Proteobacteria, Actinobacteriota, Patescibacteria declined. Mental test analysis indicated that AK, S-UE, S-β-GC are primary factors influencing community composition. Phylogenetic Investigation Communities by Reconstruction Unobserved States (PICRUSt2) demonstrated modify bacterial metabolic pathways. Our results suggest size concentration differentially affect nutrients structure function, observed at higher concentrations.

Language: Английский