Wang Simin, Zhou Qixing, Hu Xiangang, Tao Zongxin
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Carbon Neutrality Interdisciplinary Science Centre/College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Carbon Neutrality Interdisciplinary Science Centre/College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Water Res. 2024 Mar 1;251:121167. doi: 10.1016/j.watres.2024.121167. Epub 2024 Jan 17.
Microplastic contamination has become increasingly aggravated in coastal environments, further affecting biogeochemical processes involved with microbial community shifts. As a key biogeochemical process mainly driven by microbiota in coastal wetland sediments, litter decomposition contributes greatly to the global greenhouse gas (GHG) budget. However, under microplastic pollution, the relationship between microbial alterations and GHG emissions during litter decomposition in coastal wetlands remains largely unknown. Here, we explored the microbial mechanism by which polyethylene microplastic (PE-MP) influenced greenhouse gas (i.e., CH, CO and NO) emissions during litter decomposition in coastal sediments through a 75-day microcosm experiment. During litter decomposition, PE-MP exposure significantly decreased cumulative CH and CO emissions by 41.07% and 25.79%, respectively. However, there was no significant change in cumulative NO emissions under PE-MP exposure. The bacterial, archaeal, and fungal communities in sediments exhibited varied responses to PE-MP exposure over time, as reflected by the altered structure and changed functional groups of the microbiota. The altered microbial functional groups ascribed to PE-MP exposure and sediment property changes might contribute to suppressing CH and CO emissions during litter decomposition. This study yielded valuable information regarding the effects of PE-MP on GHG emissions during litter decomposition in coastal wetland sediments.
沿海环境中的微塑料污染日益严重，进一步影响了与微生物群落变化相关的生物地球化学过程。作为主要由沿海湿地沉积物中的微生物群驱动的关键生物地球化学过程，凋落物分解对全球温室气体（GHG）预算有很大贡献。然而，在微塑料污染的情况下，沿海湿地凋落物分解过程中微生物变化与温室气体排放之间的关系仍 largely unknown。在这里，我们通过一个75天的微观实验，探索了聚乙烯微塑料（PE-MP）影响沿海沉积物中凋落物分解过程中温室气体（即CH、CO和NO）排放的微生物机制。在凋落物分解过程中，PE-MP暴露分别使累积CH和CO排放显著降低了41.07%和25.79%。然而，在PE-MP暴露下，累积NO排放没有显著变化。沉积物中的细菌、古菌和真菌群落随着时间的推移对PE-MP暴露表现出不同的反应，这反映在微生物群的结构改变和功能群变化上。归因于PE-MP暴露和沉积物性质变化的微生物功能群改变可能有助于抑制凋落物分解过程中的CH和CO排放。这项研究提供了关于PE-MP对沿海湿地沉积物中凋落物分解过程中温室气体排放影响的有价值信息。
