自行车
硝化作用
环境化学
硝酸盐
反硝化
化学
氮气循环
生态系统
亚硝酸盐
固氮
矿化(土壤科学)
土壤呼吸
孵化
氮气
生态学
生物
生物化学
考古
有机化学
历史
作者
Shuwu Zhang,Lei Pei,Yanxin Zhao,Jun Shan,Xuebo Zheng,Guangjian Xu,Yuhuan Sun,Fayuan Wang
标识
DOI:10.1016/j.jhazmat.2023.131152
摘要
Both nitrogen deposition (ND) and microplastics (MPs) pose global change challenges. The effects of MPs co-existing with ND on ecosystem functions are still largely unknown. Herein, we conducted a 10-month soil incubation experiment to explore the effects of polyethylene (PE) and polylactic acid (PLA) MPs on soil multifunctionality under different ND scenarios. We found that the interactions between ND and MPs affected soil multifucntionality. FAPROTAX function prediction indicated that both ND and MPs affected C and N cycling. ND increased some C-cycling processes, such as cellulolysis, ligninolysis, and plastic degradation. MPs also showed stimulating effects on these processes, particularly in the soil with ND. ND significantly decreased the abundance of functional genes NifH, amoA, and NirK, leading to inhibited N-fixation, nitrification, and denitrification. The addition of MPs also modified N-cycling processes: 0.1% PE enriched the bacterial groups for nitrate reduction, nitrate respiration, nitrite respiration, and nitrate ammonification, and 1% PLA MPs enriched N-fixation bacteria at all ND levels. We found that ND caused lower soil pH but higher soil N, decreased bacterial diversity and richness, and changed the composition and activity of functional bacteria, which explains why ND changed soil functions and regulated the impact of MPs.
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