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Updated: Oct 20, 2025
Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
Published on: September 11, 2016
Microbial response and adaption to thallium contamination in soil profiles
Jingye She1, Juan Liu2, Hongping He3
1Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, China.
Thallium (Tl) contamination in mining soils was investigated. Geochemical factors significantly influenced bacterial communities, revealing potential for bioremediation using native microbes involved in iron, manganese, and sulfur cycles.
Area of Science:
- Environmental Science
- Microbiology
- Geochemistry
Background:
- Thallium (Tl) is a highly toxic trace metal.
- Understanding Tl's spatial distribution and its interaction with soil microorganisms, especially in mining areas, is limited.
- Mining activities can lead to significant soil contamination.
Purpose of the Study:
- To investigate the co-occurrence patterns of bacterial communities in Tl-contaminated soil profiles.
- To identify the key geochemical drivers shaping microbial community structure and distribution.
- To explore the potential for bioremediation of Tl-contaminated soils using indigenous microbes.
Main Methods:
- 16S rRNA sequencing for bacterial community analysis.
- Network analysis to decipher co-occurrence patterns.
- Geochemical analysis of soil parameters (pH, S, Tl, Fe, TOM).
- Metagenomic analysis to understand biogeochemical cycling.
Main Results:
- Geochemical parameters (pH, S, Tl, Fe, TOM) were identified as major drivers of microbial community structure and vertical distribution.
- Network analysis revealed diverse microbial modules influenced by soil depth and Tl geochemical fractionation.
- Bacterial modules were dominated by iron-reducing bacteria (FeRB), iron-oxidizing bacteria (FeOB), sulfur-oxidizing bacteria, and manganese-reducing bacteria.
- Metagenomic data indicated close involvement of iron, manganese, and sulfur cycles in the biogeochemical cycle of thallium.
Conclusions:
- Soil geochemistry significantly controls bacterial community composition and distribution in Tl-contaminated mining soils.
- The identified microbial modules and their association with Tl fractions offer insights into Tl biogeochemical cycling.
- Findings support the development of bioremediation strategies for Tl-contaminated soils utilizing indigenous microbial populations.
