Bacterial networks mediate pentachlorophenol dechlorination across land-use types with citrate addition
Journal
Journal of Hazardous Materials
Journal Volume
384
Journal Volume
384
Start Page
121295
ISSN
03043894
Date Issued
2020-02-15
Author(s)
Li, Hui
Jiang, Yuji
Chen, Lijun
Wen, Xiaocui
Huang, Minxue
Cheng, Xiaocui
Cheng, Zhongliang
Tao, Liang
Abstract
Soil microorganisms play a crucial role in the bioremediation of pentachlorophenol (PCP)-contaminated soils. However, whether and how soil bacterial networks with keystone taxa affect PCP dechlorination is not well understood. The present study investigated the effects of citrate on soil bacterial networks mediating PCP dechlorination by direct and indirect transformation in iron-rich upland and paddy soils. The rates of PCP dechlorination and Fe(II) generation were accelerated by citrate addition, particularly in the paddy soils. Network analysis revealed that the topological properties of bacterial networks were changed by citrate addition; more modules and keystone taxa were significantly correlated with PCP dechlorination and Fe(II) generation in the networks. Random forest modeling indicated that Clostridiales was the most important bacterial order; it was significantly involved in both the direct and indirect pathways of PCP dechlorination. Citrate addition had less influence on the balance between the direct and indirect pathways of PCP dechlorination in the upland soils, whereas it enhanced biological PCP dechlorination more directly and efficiently in the paddy soils. Our results suggested that land-use type and citrate addition play a critical role in controlling the biogeochemical mechanisms of PCP dechlorination.
Subjects
Citrate addition
Direct and indirect dechlorination
Fe(II) generation
Land-use type
Soil bacterial networks
SDGs
Publisher
Elsevier B.V.
Type
journal article