Occurrence and distribution of PAHs and indigenous bacteria in the soil surrounding the industrial parks of Beijing: A systematic field study

Abstract

Several studies have been devoted to the characterization of soil PAHs pollution in decommissioned industrial sites and their impacts on soil microbial community, however, the investigation on the pollutant levels and associated indigenous microbial communities of the soil surrounding the industrial parks were scare. In this study, 4 typical industrial parks of Beijing that had previously confirmed polycyclic aromatic hydrocarbons (PAHs) pollution were selected and resampled to systematically quantify the PAHs pollution and investigate their impact on indigenous bacterial community and function diversity. The detection frequency of PAHs among 76 soils is 5.26 %, the maximum of total PAHs is 8.33 mg kg^–1. Principal co-ordinates analysis (PCoA) results showed that the soil bacterial communities and functions among different industrial parks, locations, or distance from the boundary of respective industrial park were not showed significant differences (p > 0.05). The network analysis results showed that the complexity, natural connectivity and stability of the networks followed the order of FSGY > JJJS > LHJJ > YSSH, which revealed that the PAHs exposure caused some stress to soil indigenous microbes. The main factor impacting bacterial communities and functions is total PAHs in the soil, which increased the alpha diversity of bacterial communities, while decreased the complexity and stability of respective network. Distance-decay relationship (DDR) analysis identified geographical distance as the primary driver on soil bacterial community compared with environmental variability. Our results will enhance the understanding of PAHs pollution and the indigenous bacteria characteristic of the soil surrounding industrial parks and favor the sustainable management of industrial parks.