数字农科院2.0

Combined effects of mulch film-derived microplastics and pesticides on soil microbial communities and element cycling

文献类型： 外文期刊

作者： Changcai Wu;Xianpeng Song;Dan Wang;Yajie Ma;Yongpan Shan;Xiangliang Ren;Hongyan Hu;Jinjie Cui;Yan Ma

作者机构：

关键词： Elements cycling;Microbial communities;Microplastics;Pesticide;Plastic mulch film

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2024 年 466 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Pesticides and microplastics (MPs) derived from mulch film in agricultural soil can independently impact soil ecology, yet the consequences of their combined exposure remain unclear. Therefore, the effects of simultaneous exposure to commonly used pesticides (imidacloprid and flumioxazin) and aged mulch film-derived MPs on soil microorganisms and element cycles in cotton fields were investigated. The combined exposure influenced soil microorganisms, alongside processes related to carbon, nitrogen, and phosphorus cycles, exhibiting effects that were either neutralized or enhanced compared to individual exposures. The impact of pesticides in combined exposure was notably more significant and played a dominant role than that of MPs. Specifically, combined exposure intensified changes in soil bacterial community and symbiotic networks. The combined exposure neutralized NH4+, NO3-, DOC, and A-P contents, shifting from 0.33 % and 40.23 % increase in MPs and pesticides individually to a 40.24 % increase. Moreover, combined exposure resulted in the neutralization or amplification of the nitrogen-fixing gene nifH, nitrifying genes (amoA and amoB), and denitrifying genes (nirS and nirK), the carbon cycle gene cbbLG and the phosphorus cycle gene phoD from 0.48 and 2.57-fold increase to a 2.99-fold increase. The combined exposure also led to the neutralization or enhancement of carbon and nitrogen cycle functional microorganisms, shifting from a 1.53-fold inhibition and 10.52-fold increase to a 6.39-fold increase. These findings provide additional insights into the potential risks associated with combined pesticide exposure and MPs, particularly concerning soil microbial communities and elemental cycling processes.

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