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Spatial Variability of PAHs and Microbial Community Structure in Surrounding Surficial Soil of Coal-Fired Power Plants in Xuzhou, China

View Article: PubMed Central - PubMed

ABSTRACT

This work investigated the spatial profile and source analysis of polycyclic aromatic hydrocarbons (PAHs) in soil that surrounds coal-fired power plants in Xuzhou, China. High-throughput sequencing was employed to investigate the composition and structure of soil bacterial communities. The total concentration of 15 PAHs in the surface soils ranged from 164.87 to 3494.81 μg/kg dry weight. The spatial profile of PAHs was site-specific with a concentration of 1400.09–3494.81 μg/kg in Yaozhuang. Based on the qualitative and principal component analysis results, coal burning and vehicle emission were found to be the main sources of PAHs in the surface soils. The phylogenetic analysis revealed differences in bacterial community compositions among different sampling sites. Proteobacteria was the most abundant phylum, while Acidobacteria was the second most abundant. The orders of Campylobacterales, Desulfobacterales and Hydrogenophilales had the most significant differences in relative abundance among the sampling sites. The redundancy analysis revealed that the differences in bacterial communities could be explained by the organic matter content. They could also be explicated by the acenaphthene concentration with longer arrows. Furthermore, OTUs of Proteobacteria phylum plotted around particular samples were confirmed to have a different composition of Proteobacteria phylum among the sample sites. Evaluating the relationship between soil PAHs concentration and bacterial community composition may provide useful information for the remediation of PAH contaminated sites.

No MeSH data available.


Related in: MedlinePlus

Triangle graph of percentage density for 15 PAHs in the sampling sites.
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ijerph-13-00878-f003: Triangle graph of percentage density for 15 PAHs in the sampling sites.

Mentions: According to ring numbers, 15 PAHs were classified into three classes: 2–3 ring, 4-ring, and 5–6 ring compositions. These three classes represented low, medium and high molecular weight PAHs, respectively. Figure 3 shows the composite model of 15 PAHs. 4-ring PAHs comprised more than 50% of the total PAHs in all sampling sites, in particularly sites dt, hm and yz, which all had two samples with more than 75% 4-ring composition. For the composition of 2–3 ring and 5–6 ring PAHs, significant discrepancies were detected between sampling sites. Sites px and hm had higher 5–6 ring PAHs composition, while sites hr and qt had higher 2–3 ring composition. These findings indicated that there may be different sources for the PAHs in the soils surrounding different sampling sites. The component percentages of PAHs at sites hr and qt were similar, suggesting their similar pollution sources. Relative to low molecular weight PAHs (2–3 rings), PAHs with higher molecular weights (≥4 rings) adsorb more easily on particulate matter, such as soil particles [35].


Spatial Variability of PAHs and Microbial Community Structure in Surrounding Surficial Soil of Coal-Fired Power Plants in Xuzhou, China
Triangle graph of percentage density for 15 PAHs in the sampling sites.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036711&req=5

ijerph-13-00878-f003: Triangle graph of percentage density for 15 PAHs in the sampling sites.
Mentions: According to ring numbers, 15 PAHs were classified into three classes: 2–3 ring, 4-ring, and 5–6 ring compositions. These three classes represented low, medium and high molecular weight PAHs, respectively. Figure 3 shows the composite model of 15 PAHs. 4-ring PAHs comprised more than 50% of the total PAHs in all sampling sites, in particularly sites dt, hm and yz, which all had two samples with more than 75% 4-ring composition. For the composition of 2–3 ring and 5–6 ring PAHs, significant discrepancies were detected between sampling sites. Sites px and hm had higher 5–6 ring PAHs composition, while sites hr and qt had higher 2–3 ring composition. These findings indicated that there may be different sources for the PAHs in the soils surrounding different sampling sites. The component percentages of PAHs at sites hr and qt were similar, suggesting their similar pollution sources. Relative to low molecular weight PAHs (2–3 rings), PAHs with higher molecular weights (≥4 rings) adsorb more easily on particulate matter, such as soil particles [35].

View Article: PubMed Central - PubMed

ABSTRACT

This work investigated the spatial profile and source analysis of polycyclic aromatic hydrocarbons (PAHs) in soil that surrounds coal-fired power plants in Xuzhou, China. High-throughput sequencing was employed to investigate the composition and structure of soil bacterial communities. The total concentration of 15 PAHs in the surface soils ranged from 164.87 to 3494.81 μg/kg dry weight. The spatial profile of PAHs was site-specific with a concentration of 1400.09–3494.81 μg/kg in Yaozhuang. Based on the qualitative and principal component analysis results, coal burning and vehicle emission were found to be the main sources of PAHs in the surface soils. The phylogenetic analysis revealed differences in bacterial community compositions among different sampling sites. Proteobacteria was the most abundant phylum, while Acidobacteria was the second most abundant. The orders of Campylobacterales, Desulfobacterales and Hydrogenophilales had the most significant differences in relative abundance among the sampling sites. The redundancy analysis revealed that the differences in bacterial communities could be explained by the organic matter content. They could also be explicated by the acenaphthene concentration with longer arrows. Furthermore, OTUs of Proteobacteria phylum plotted around particular samples were confirmed to have a different composition of Proteobacteria phylum among the sample sites. Evaluating the relationship between soil PAHs concentration and bacterial community composition may provide useful information for the remediation of PAH contaminated sites.

No MeSH data available.


Related in: MedlinePlus