Cao Lifeng, Xu Wenxin, Wan Ziren, Li Guanghe, Zhang Fang
State Key Joint Laboratory of Environmental Simulation and Pollution Control, State Environment Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, China.
iScience. 2022 Mar 17;25(4):104084. doi: 10.1016/j.isci.2022.104084. eCollection 2022 Apr 15.
Fire-training areas (FTAs) are an important source of perfluoroalkyl and polyfluoroalkyl substances (PFASs) pollution. However, the effect of PFASs on soil bacterial communities remains limited. Here, we detected the PFASs in soils ranging from 3.4 to 531.7 μg kg dry weight in seven plots at an FTA where PFOS-restricted aqueous film-forming foams (AFFFs) have been used for 6 years. PFOS was still the dominant homologue despite the restriction by Stockholm Convention, but it was almost three orders of magnitude lower than that in previous studies. PFASs played an important role in shaping the bacterial community, and high levels of PFASs (>100 μg kg dw) reduced the biodiversity and connectivity of soil bacteria. The extreme condition-tolerant bacteria were identified as biomarkers at the FTA. Our study provides valuable insights into the effect of PFOS-restricted AFFFs on soil bacterial communities at the FTA.
消防训练区域（FTAs）是全氟烷基和多氟烷基物质（PFASs）污染的一个重要来源。然而，PFASs对土壤细菌群落的影响仍然有限。在此，我们在一个消防训练区域的七个地块中检测了土壤中的PFASs，其含量在3.4至531.7微克/千克干重之间，该区域使用全氟辛烷磺酸限制型水成膜泡沫（AFFFs）已有6年。尽管受到《斯德哥尔摩公约》的限制，全氟辛烷磺酸（PFOS）仍是主要同系物，但比之前研究中的含量低了近三个数量级。PFASs在塑造细菌群落方面发挥了重要作用，高含量的PFASs（>100微克/千克干重）降低了土壤细菌的生物多样性和连通性。极端耐环境细菌被确定为该消防训练区域的生物标志物。我们的研究为全氟辛烷磺酸限制型AFFFs对消防训练区域土壤细菌群落的影响提供了有价值的见解。
