State Key Laboratory of Black Soils Conservation and Utilization, Changchun 130102, China; Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Black Soils Conservation and Utilization, Changchun 130102, China; Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
J Hazard Mater. 2024 Dec 5;480:136378. doi: 10.1016/j.jhazmat.2024.136378. Epub 2024 Oct 31.
Recently, concerns have been raised regarding concurrent pollution by microplastics and antibiotics in agricultural aquatic ecosystems. However, knowledge gaps remain regarding their combined effects on greenhouse gas (GHG) emissions and bacterial community assembly mechanisms. To address this, a microcosm experiment was performed to investigate the GHG (CH, CO, and NO) emission characteristics and bacterial community assembly mechanisms in agricultural ditch sediments under co-exposure to different microplastics (polythene (PE), polylactic acid (PLA)), and sulfanilamide (SA). The global warming potential (GWP) of the different treatments was ranked as follows: SA+PLA (162.96 mg/m/h) > PLA (123.49 mg/m/h) > SA (11.75 mg/m/h) > SA+PE (102.33 mg/m/h) > CK (without microplastics or antibiotics, 84.67 mg/m/h) > PE (78.29 mg/m/h). Additionally, a phylogenetic bin-based null model and molecular ecological network analysis indicated that SA-induced selective pressures reduced compositional turnover, whereas microplastics enhanced drift effects and decreased network robustness. The co-contamination of SA with different microplastics exhibited the opposite effect on the network and assembly process, suggesting that disturbance-mediated species dominance alters the colonization of rare species. Collectively, these findings provide valuable evidence that the synergistic effects of biodegradable microplastic and SA can promote GHG emissions and influence the mechanisms underlying community assembly processes.
最近，人们对农业水生生态系统中微塑料和抗生素的并发污染问题表示担忧。然而，对于它们对温室气体（GHG）排放和细菌群落组装机制的联合影响，仍存在知识空白。为了解决这个问题，进行了一个微宇宙实验，以研究在农业沟渠沉积物中，同时暴露于不同微塑料（聚乙烯（PE）、聚乳酸（PLA））和磺胺甲恶唑（SA）下，GHG（CH、CO 和 NO）排放特征和细菌群落组装机制。不同处理的全球变暖潜势（GWP）排名如下：SA+PLA（162.96 mg/m/h）>PLA（123.49 mg/m/h）>SA（11.75 mg/m/h）>SA+PE（102.33 mg/m/h）>CK（无微塑料或抗生素，84.67 mg/m/h）>PE（78.29 mg/m/h）。此外，基于系统发育分类群的零模型和分子生态网络分析表明，SA 诱导的选择压力降低了组成周转率，而微塑料增强了漂移效应并降低了网络稳健性。SA 与不同微塑料的共污染对网络和组装过程表现出相反的影响，表明干扰介导的物种优势改变了稀有物种的定殖。总的来说，这些发现提供了有价值的证据，表明可生物降解微塑料和 SA 的协同作用可以促进 GHG 排放，并影响群落组装过程的机制。
