ORIGINAL RESEARCH
The Influence Mechanism of Cultivated Soil
Cd Pollution on Soil Bacterial Community
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1
School of Law and Public Affairs, Nanjing Tech University, Nanjing 211816, China
2
School of Public Affairs, Zhejiang University, Hangzhou 310058, China
3
School of Public Administration, Zhejiang University of Finance and Economics, Hangzhou 310018, China
Submission date: 2024-07-25
Final revision date: 2024-11-18
Acceptance date: 2025-01-17
Online publication date: 2025-03-17
Corresponding author
Guangyu Li
School of Public Administration, Zhejiang University of Finance and Economics, Hangzhou 310018, China
KEYWORDS
TOPICS
ABSTRACT
Soil pollution with cadmium (Cd) poses a significant threat to the global natural environment,
negatively impacting soil health and food security, particularly in China. Cd pollution influences bacterial
communities directly and indirectly by altering soil physicochemical properties, including pH, soil
particle size (SPS), moisture content (MC), organic matter (OM), available phosphorus (AP), available
potassium (AK), total nitrogen (TN), catalase activity (SC), phosphatase activity (SP), urease activity
(SU), and concentrations of heavy metals such as copper (Cu), cadmium (Cd), lead (Pb), chromium
(Cr), arsenic (As), mercury (Hg), nickel (Ni), and zinc (Zn). In this study, 50 farmlands were randomly
selected in J County, eastern China. High-throughput 16S rRNA sequencing was employed to analyze
the soil bacterial community structure and its relationship with various environmental factors across
different levels of Cd pollution. The results indicated: (1) Sobs and Chao (bacterial community richness
indexes), along with Shannon and Invsimpson (bacterial diversity indexes), were significantly higher in
severely Cd-polluted soil compared to moderately polluted soil. (2) In moderately polluted cultivated
land, nine bacterial phyla exhibited strong transfer and absorption functions for Ni and Hg, while three
genera were positively correlated with Cr and Ni. Conversely, in severely polluted soil samples, the
relative abundances of 11 bacterial phyla and four genera showed significant positive correlations with
Cr, Cu, Pb, and Zn. (3) The functional abundance of bacterial communities in severely Cd-polluted
environments was significantly greater than that in moderately polluted ones, at a significance level
of p<0.05. These results indicate the presence of heavy metal-tolerant bacteria in Cd-polluted soils.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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