Effects of microplastics and nitrogen deposition on soil multifunctionality, particularly C and N cycling

文献类型： 外文期刊

第一作者： Zhang, Shuwu

作者： Zhang, Shuwu;Pei, Lei;Zhao, Yanxin;Xu, Guangjian;Sun, Yuhuan;Wang, Fayuan;Shan, Jun;Zheng, Xuebo

作者机构：

关键词： Nutrient cycling; Litter decomposition; Ecosystem functions; Soil enzymes; Bacterial diversity

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2023 年 451 卷

页码：

收录情况： SCI

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 in-cubation experiment to explore the effects of polyethylene (PE) and polylactic acid (PLA) MPs on soil multi -functionality 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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