Microplastics affect soil bacterial community assembly more by their shapes rather than the concentrations

文献类型： 外文期刊

第一作者： Wang, Peng-Yang

作者： Wang, Peng-Yang;Zhao, Ze-Ying;Xiong, Xiao-Bin;Wang, Ning;Hao, Meng;Wang, Song;Ma, Yue;Uzamurera, Aimee Grace;Xiao, Kai-Wen;Khan, Aziz;Tao, Hong-Yan;Xiong, You-Cai;Zhou, Rui;Zhang, Zhi-Ming;Ding, Fan;Tao, Xiu-Ping;Wang, Wen-Ying

作者机构：

关键词： Microplastics pollutant; Shape and concentration; Interface structure; Bacterial community assembly; Diversity and functioning

期刊名称：WATER RESEARCH （ 影响因子：12.8； 五年影响因子：13.3 ）

ISSN： 0043-1354

年卷期： 2023 年 245 卷

页码：

收录情况： SCI

摘要： Polyethylene film mulching is a key technology for soil water retention in dryland agriculture, but the aging of the films can generate a large number of microplastics with different shapes. There exists a widespread misunderstanding that the concentrations of microplastics might be the determinant affecting the diversity and assembly of soil bacterial communities, rather than their shapes. Here, we examined the variations of soil bacteria community composition and functioning under two-year field incubation by four shapes (ball, fiber, fragment and powder) of microplastics along the concentration gradients (0.01%, 0.1% and 1%). Data showed that specific surface area of microplastics was significantly positively correlated with the variations of bacterial community abundance and diversity (r=0.505, p<0.05). The fragment- and fiber-shape microplastics displayed more pronounced interfacial continuity with soil particles and induced greater soil bacterial alpha-diversity, relative to the powder- and ball-shape ones. Strikingly, microplastic concentrations were not significantly correlated with bacterial community indices (r=0.079, p>0.05). Based on the variations of the beta NTI, bacterial community assembly actually followed both stochastic and deterministic processes, and microplastic shapes significantly modified soil biogeochemical cycle and ecological functions. Therefore, the shapes of microplastics, rather than the concentration, significantly affected soil bacterial community assembly, in association with microplastic-soilwater interfaces.

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