Plant biomass mediates the decomposition of polythene film-sourced pollutants in soil through plastisphere bacteria island effect

作者：Ze‐Ying Zhao, Peng-Yang Wang, Xiao‐Bin Xiong, Rui Zhou, Feng‐Min Li, Zheng‐Guo Cheng, Wei Wang, Fei Mo, Kiprotich Wesly Cheruiyot, Wenying Wang, Aimee Grace Uzamurera, Hong‐Yan Tao, You‐Cai Xiong · 发表于：Environment International · 年份：2023 · DOI：10.1016/j.envint.2023.108114 · 被引用次数：16 · 研究领域：Microplastics and Plastic Pollution、Pharmaceutical and Antibiotic Environmental Impacts、Pesticide and Herbicide Environmental Studies

The polyethylene (PE) film mulching as a water conservation technology has been widely used in dryland agriculture, yet the long-term mulching has led to increasing accumulation of secondary pollutants in soils. The decomposition of PE film-sourced pollutants is directly associated with the enrichment of specific bacterial communities. We therefore hypothesized that plant biomass may act as an organic media to mediate the pollutant decomposition via reshaping bacterial communities. To validate this hypothesis, plant biomass (dried maize straw and living clover) was embedded at the underlying surface of PE film, to track the changes in the composition and function of bacterial communities in maize field across two years. The results indicated that both dry crop straw and alive clover massively promoted the α-diversity and abundance of dominant bacteria at plastisphere, relative to bulk soil. Bacterial communities tended to be clustered at plastisphere, forming the bacteria islands to enrich pollutant-degrading bacteria, such as Sphingobacterium, Arthrobacter and Paracoccus. As such, plastisphere bacteria islands substantially enhanced the degradation potential of chloroalkene and benzoate (p < 0.05). Simultaneously, bacterial network became stabilized and congregated at plastisphere, and markedly improved the abundance of plastisphere module hubs and connectors bacteria via stochastic process. Particularly, bacterial community composition and plastic film-sourced pollutants me...