数字农科院2.0

Regulatory path for soil microbial communities depends on the type and dose of microplastics

文献类型： 外文期刊

作者： Ruimin Qi;Davey L. Jones;Yuanyuan Tang;Fengxiang Gao;Jiawei Li;Yihan Chi;Changrong Yan

作者机构：

关键词： Ecological function;Microbial community;Microplastic;Regulatory mechanism;Structural equation modeling

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2024 年 473 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： To reveal the feedbacks and regulating mechanisms of microplastic types and doses on microbial community, a microcosm experiment was carried out with two non-degradable microplastics [polyethylene (PE) and polyvinyl chloride (PVC)] and four biodegradable microplastics [poly(butylene succinate) (PBS), polyhydroxyalkanoates (PHA), poly(butyleneadipate-co-terephthalate) (PBAT), and polypropylene carbonate (PPC)] at different levels (1 %, 7 %, and 28 %). As a result, the content of total carbon (TC), soil organic carbon (SOC), and microbial biomass carbon (MBC) (expect MBC in PBS soil) increased with increasing doses of microplastics, and increased at the lowest PE dose rate. Biodegradable microplastics created a more active ecological niche while enriching more pathogens than non-degradable microplastics. Structural equation modeling indicated that microbial diversities were in a type-dependent assembly, whereas microbial compositions were more profoundly affected by the microplastic doses, ultimately. The standardized total effect coefficient of microplastic types on bacterial and fungal diversities was − 0.429 and − 0.282, and that of doses on bacterial and fungal compositions was 0.487 and 0.336, respectively. Both microplastic types and doses significantly impacted pH, electrical conductivity, total nitrogen, TC, SOC, and MBC, subsequently inhibiting microbial diversities and stimulating microbial compositions with particular pathways. The results provide a comprehensive understanding for evaluating the potential risk of microplastics.

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