Distributions of chlorinated paraffins and the effects on soil microbial community structure in a production plant brownfield site
Distributions of chlorinated paraffins and the effects on soil microbial community structure in a production plant brownfield site
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某生产厂棕地氯化石蜡的分布及其对土壤微生物群落结构的影响
DOI：
10.1016/j.envpol.2020.114328
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发表时间：
2020-07-01
影响因子：
8.9
通讯作者：
Liu, Xiaowen
中科院分区：
文献类型：
--
作者：
Wu, Yingxin;Wu, Jiahui;Liu, Xiaowen
氯化石蜡(CPS)在土壤中的分布及其生态效应引起了人们的广泛关注，但现场尺度的数据仍然很少。本研究通过对一家CP生产厂棕地土壤中CP的分布及其对土壤微生物群落的影响进行了全面的调查。大多数样品中检测到短链、中链和长链CPS，总含量分别为ND-5,090，ND-6,670和ND-1450 ng g(-1)(Dw)。在合成车间下方10m处观察到一个CP热点，表明CPS向下迁移。土壤SCCP同系物剖面与商品CP-52的一致性表明，CP产品的渗漏是污染源。除CPS外，合成车间下方还存在石油碳氢化合物(PHC)污染。土壤微生物群落组成和多样性受到短链氯化石蜡(p<；0.05)的显著影响，尽管与其他相关污染物相比，它们的含量较低。微生物网络分析显示非随机共生模式，不动杆菌、短杆菌、棒状杆菌、微杆菌、营养单胞菌和变种杆菌是关键属。同一模块中的属显示出显著的生态联系(p<；0.05)，并参与了PHCS和氯化有机污染物的降解。这项研究首次对CP污染土壤中的微生物群落进行了系统发育研究，表明长期暴露于CPS和PHCS可能会导致具有降解潜力的微生物群落。(C)2020爱思唯尔有限公司。保留所有权利。
The distributions of chlorinated paraffins (CPs) in soils and their ecological effects attract much attention, while site-scale data are still scarce. In this study, a comprehensive investigation was performed to understand the CP distributions at a CP production plant brownfield site, as well as their effects on soil microbial community. Short-, medium- and long-chain CPs (SCCPs, MCCPs, LCCPs) were detected in most samples with total contents ranging ND-5,090, ND-6,670, and ND-1450 ng g(-1) (dw), respectively. A CP-hotspot was observed 10 m beneath the synthesis workshop, indicating the downward migration of CPs. The consistence of soil SCCP congener profiles with commercial product CP-52 suggested the leakage of CP products as the contamination source. Besides CPs, petroleum hydrocarbons (PHC) contamination also occurred beneath the synthesis workshop. Soil microbial community composition and diversity were significantly influenced by SCCPs (p < 0.05) despite their lower contents compared to other concerned contaminants. Microbial network analysis indicated nonrandom co-occurrence patterns, with Acinetobacter, Brevibacterium, Corynebacterium, Microbacterium, Stenotrophomonas, and Variibacter as the keystone genera. Genera from the same module showed significant ecological links (p < 0.05) and were involved in the degradation of PHCs and chlorinated organic contaminants. This study provides the first phylogenetic look at the microbial communities in CP contaminated soils, indicating that the long-term exposure to CPs and PHCs may lead to microbial group assemblages with the potential for degradation. (C) 2020 Elsevier Ltd. All rights reserved.