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To have explored the mechanism of the impact of MPs on the nitrogen metabolism function of water bodies, the study had conducted indoor simulation experiments from the perspective of microorganisms. Specifically, it had experimentally tested the impact of traditional polyethylene (PE) microplastics and biodegradable polylactic acid (PLA) microplastics at various concentrations (0, 1, 5, and 10mg/L) on total nitrogen (TN), ammonium (NH4+-N), nitrite (NO2--N), and nitrate (NO3--N) levels. Furthermore, it had analyzed the effects on nitrogen-metabolizing microbial communities and their functional genes. The results had shown that both PE and PLA microplastics had contribute to nitrogen accumulation in water. PE microplastics increased TN concentrations by 53.77% to 94.76%, while PLA microplastics had caused an increase of 24.04% to 48.74% compared to the control. The impact on different nitrogen forms had varied according to the type and concentration of microplastics. Notably, PE microplastics had been negatively correlated with nitrogen-fixing bacteria, such as Cyanobacteria, whereas PLA microplastics had exhibited a positive correlation with bacteria involved in inorganic nitrogen processes, such as Actinobacteria. It had further shown that both PE and PLA microplastics had significantly affected genes responsible for nitrogen fixation, nitrate reduction, and denitrification. This research had highlightsed the complex effects of microplastics on nitrogen cycling in aquatic systems, with the same particle size but different types and concentrations of MPs leading to varied outcomes on microbial community structure and nitrogen metabolism functions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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