Journalartikel

Jahr der Veröffentlichung: 2024

Zeitschrift: Journal of Hazardous Materials

Bandnummer: 478

ISSN: 0304-3894

eISSN: 1873-3336

DOI Link: https://doi.org/10.1016/j.jhazmat.2024.135528

Verlag: Elsevier

Abstract: 
Microplastics (MPs) in agricultural plastic film mulching system changes microbial functions and nutrient dynamics in soils. However, how biodegradable MPs impact the soil gross nitrogen (N) transformations and crop N uptake remain significantly unknown. In this study, we conducted a paired labeling 15N tracer experiment and microbial N-cycling gene analysis to investigate the dynamics and mechanisms of soil gross N transformation processes in soils amended with conventional (polyethylene, PE) and biodegradable (polybutylene adipate coterephthalate, PBAT) MPs at concentrations of 0 %, 0.5 %, and 2 % (w/w). The biodegradable MPs-amended soils showed higher gross N mineralization rates (0.5-16 times) and plant N uptake rates (16-32 %) than soils without MPs (CK) and with conventional MPs. The MPs (both PE and PBAT) with high concentration (2 %) increased gross N mineralization rates compared to low concentration (0.5 %). Compare to CK, MPs decreased the soil gross nitrification rates, except for PBAT with 2 % concentration; while PE with 0.5 % concentration and PBAT with 2 % concentration increased but PBAT with 0.5 % concentration decreased the gross N immobilization rates significantly. The results indicated that there were both a concentration effect and a material effect of MPs on soil gross N transformations. Biodegradable MPs increased N-cycling gene abundance by 60-103 %; while there was no difference in the abundance of total N-cycling genes between soils without MPs and with conventional MPs. In summary, biodegradable MPs increased N cycling gene abundance by providing enriched nutrient substrates and enhancing microbial biomass, thereby promoting gross N transformation processes and maize N uptake in short-term. These findings provide insights into the potential consequences associated with the exposure of biodegradable MPs, particularly their impact on soil N cycling processes.

Harvard-Zitierstil: Zhang, H., Zhu, W., Zhang, J., Müller, C., Wang, L. and Jiang, R. (2024) Enhancing soil gross nitrogen transformation through regulation of microbial nitrogen-cycling genes by biodegradable microplastics, Journal of Hazardous Materials, 478, Article 135528. https://doi.org/10.1016/j.jhazmat.2024.135528

APA-Zitierstil: Zhang, H., Zhu, W., Zhang, J., Müller, C., Wang, L., & Jiang, R. (2024). Enhancing soil gross nitrogen transformation through regulation of microbial nitrogen-cycling genes by biodegradable microplastics. Journal of Hazardous Materials. 478, Article 135528. https://doi.org/10.1016/j.jhazmat.2024.135528