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| Quantitative analysis of microplastic concentration in soil from different mulching years based on Py-GCMS and variation in microbial community |
| Received:May 07, 2024 |
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| KeyWord:microplastics;Py-GCMS;microplastic concentration;microbial community;mulch film |
| Author Name | Affiliation | E-mail | | HUANG Pengxinyue | School of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | LIU Yuhang | School of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | LÜ Fengyuan | School of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Yanyan | School of Resources, Sichuan Agricultural University, Chengdu 611130, China
State Key Laboratory of Southwest Crop Gene Resource Discovery and Utilisation, Sichuan Agricultural University, Chengdu 611130, China | yanyan.zhang@sicau.edu.cn | | GAO Xuesong | School of Resources, Sichuan Agricultural University, Chengdu 611130, China | xuesonggao@sicau.edu.cn |
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| Abstract: |
| In this study, we collected soil from agricultural fields with 5, 15 and no years of mulching, using Py-GCMS to quantify soil microplastic concentration and high-throughput sequencing to investigate the effects of different years of mulching on soil microplastic concentration and the changes of microorganisms in the ecological niche of residual film and soil microbial community. The study showed that with the age of mulching, the microplastic concentration in the soil changed. The results showed that the soil microplastic concentration tended to increase with the increase of mulching years. The concentration of microplastics in the soil of the 5-year mulch（Site A）was 0.47 g·kg-1, while the concentration of microplastics in the soil of the 15-year mulch（Site B）was 2.66 g·kg-1. In addition, the study also showed that the mulching time had significant effects on the abundance, diversity and species composition of the soil microbial community . Bacterial abundance and diversity were higher than that of the bacteria on the film in the 5-year mulched（Site A）, while in the 15-year mulched（Site B）, the bacterial abundance was lower than that of the bacteria on the film but the diversity of the bacteria was higher than that of the bacteria on the film.Fungal abundance was higher than that of the fungus on the film in the 5-year mulched（Site A）, but the soil fungal diversity was lower than that of the fungus on the film, while the fungal abundance and diversity were higher than that of the fungus on the film in the 15-year mulched（Site B）. Despite the differences in geographic location, crop species and agricultural practices, the residual film surfaces of the soils were enriched with strains of bacteria with the ability to degrade plastics, including Pseudomonas, Nocardioides and others. This demonstrates that the presence of plastic residual films promoted the growth of specific bacteria in the soil. In conclusion, this study highlighted that the pollution level of soil microplastics increased with the years of mulching and demonstrated that microplastics caused changes in the microbial community of the surrounding environment. |
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