Microplastic-induced alterations in growth and microecology of mulberry seedlings: Implications for sustainable forest-soil systems

文献类型： 外文期刊

第一作者： Wu, Huazhou

作者： Wu, Huazhou;Lou, Dezhao;Lu, Fuping;Geng, Tao;Wang, Shuchang;Wu, Huazhou;Sun, Xiaoyan

作者机构：

关键词： Mulberry-soil system; Microplastics; nifH/nirK; Acidobacteriota; Microecological structure

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.3； 五年影响因子：8.1 ）

ISSN： 0269-7491

年卷期： 2025 年 376 卷

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收录情况： SCI

摘要： This study investigated the ecotoxicological effects of polyethylene (PE) and polylactic acid (PLA) microplastics (MPs) on mulberry growth and soil-microbe interactions through controlled pot experiments (0.1 % and 1 % concentrations). PE exposure significantly increased mulberry height by 16 % (0.1 %) and 18 % (1 %) (p < 0.05), whereas PLA reduced total biomass by 12 % (0.1 %) and 66 % (1 %), highlighting polymer- and concentration-dependent responses. MPs differentially modulated soil biogeochemistry: PE decreased nitrate and ammonium nitrogen levels while enhancing nitrogen fixation (nifH) (from 0.9 x 10(7) to 6.1 x 10(7) copies/g) and denitrification (nirK) (from 1.0 x 10(8) to 1.9 x 10(8) copies/g) gene expression via Acidobacteriota enrichment, which was correlated with increased soil organic matter mobilisation and photosynthetic rates. PLA disrupted phosphorus cycling and destabilised structure of fungal communities critical for nutrient assimilation. Structural equation modelling identified direct microplastic-soil-plant linkages, with real-time polymerase chain reaction validating PE-driven suppression of nitrogen loss through microbial functional shifts. These findings illuminate the dual roles of microplastics as ecological stressors and modifiers, providing actionable insights for balancing agricultural productivity and soil health in MP-contaminated forest ecosystems.

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