Soil nitrogen deficiency aggravated the aging of biodegradable microplastics in paddy soil under the input of organic substances with contrasting C/N ratios

文献类型： 外文期刊

第一作者： Huang, Junxia

作者： Huang, Junxia;Liu, Yidan;Xie, Huifang;Liu, Xiaobo;Wang, Bingyu;Huang, Junxia;Liu, Yidan;Feng, Yanfang

作者机构：

关键词： Biodegradable microplastics; Aging process; Paddy soil; Straw return; Organic fertilizer

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 487 卷

页码：

收录情况： SCI

摘要： The application of organic substances to the agricultural field has effectively enhanced soil nutrient levels and crop yields. Biodegradable microplastics (bio-MPs), a pervasive emerging contaminant, may potentially impact the soil ecosystem through their aging process. Here, a 150-day dark incubation experiment was conducted to elucidate the disparities in the aging process of polylactic acid bio-MPs (PLA-MPs) in soils with contrasting C/N ratios of organic substances, as the mechanisms underlying this process remain unclear. The study found that PLA-MPs resulted in an increase in soil pH, nutrient levels, and organic carbon content in soil-straw system. Additionally, PLA-MPs significantly influenced bacterial community composition and microbial metabolic activity in soil-straw system. Notably, more pronounced aging features of PLA-MPs was observed in soil-straw system (lower soil nitrogen environment) compared to soil-fertilizer system (higher soil nitrogen environment). Under lower soil nitrogen conditions, microorganisms may accelerate the aging process of PLA-MPs due to their preference for readily available energy sources; conversely, under higher soil nitrogen conditions, the aging of PLA-MPs may be decelerated as microorganisms preferentially utilize substances with easily accessible energy sources. Our findings provide valuable insights into the interaction between PLA-MPs and soil amended with the organic substances of contrasting C/N ratios.

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