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Published on: July 24, 2018
Characterization of soil bacterial pathogens in peri-urban zones across population density gradients and land use
Wenyao Li1, Jiacheng Zou1, Caihong Yu1
1School of Chemical & Environmental Engineering, China University of Mining and Technology (Beijing), 100083, Beijing, China.
Abstract:
The distribution and spread of potential soil pathogens are impacted, either directly or indirectly, by the land use and population densities that occur throughout urbanization. However, how this occurs and shapes the soil potential pathogen community remains unknown. In this study, the effects of population density and land use on the characteristics of soil pathogen community were investigated in the fringe area of megacities. Animal, plant, and zoonotic pathogen diversity (Shannon index) was mainly regulated by population density, and zoonotic pathogen diversity also changed with land use. The results of the neutral community model showed that the increase in population density enhanced the stochastic processes of the pathogen community. Notably, the network analysis revealed that the network between potential pathogens and non-pathogenic bacteria communities in soil in high-density population areas had more network nodes and negative links than other population densities, indicating intense competition between the two. Furthermore, the structural equation model demonstrated that land use and population density influenced the location and composition of various types of pathogens by influencing soil properties and the diversity of the non-pathogenic bacteria community. These findings can provide scientific recommendations for land management and ecological protection in urban periphery areas.
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