From biodegradation to biohazard: Polylactic acid microplastics induced rice growth inhibition in agroecosystems

文献类型： 外文期刊

第一作者： Lin, Bigui

作者： Lin, Bigui;Fan, Qingfang;Liu, Fang;Wang, Luya;Wei, Chaoxian;Liu, Beibei;Zhao, Juan;Lin, Bigui;Wang, Luya;Wei, Chaoxian;Liu, Beibei;Fan, Qingfang;Zhao, Juan;Liu, Fang;Zuo, Linzi;Xie, Yi

作者机构：

关键词： Polylactic acid microplastics (PLA-MPs); Soil nitrogen-phosphorus cycling; Phytotoxicity; Degradation; Agroecosystems

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 496 卷

页码：

收录情况： SCI

摘要： The increasing use of biodegradable plastics necessitates critical evaluation of their environmental safety. This study investigated the effects of polylactic acid microplastics (PLA-MPs, 0.1-2.5 % w/w) on rice-soil systems using controlled pot experiments integrated with enzymatic assays, rhizosphere bacterial profiling, and non-target analysis of degradation products. PLA-MPs exposure inhibited rice growth by reducing photosynthetic efficiency and root development, which was associated with decreased nitrogen availability (30-60 % reduction in NH+4/NO-3-N), altered phosphorus levels, and reduced microbial alpha-diversity. Foliar fertilization alleviated phytotoxic effects by improving antioxidant responses and nutrient uptake. Non-target screening identified lactic acid derivatives as dominant degradation products, with limited long-term persistence. The degradation rate of PLA-MPs was estimated at 0.065 mg & sdot;d-1 under soil conditions. These results indicate that PLA-MPs, despite their biodegradable nature, can adversely affect soil nutrient cycling and crop performance. These findings emphasize the need to re-evaluate biodegradable plastic use in agriculture and promote integrated mitigation strategies to reduce microplastic-induced stress and support sustainable soil-plant systems.

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