Soil microbial community assembly model in response to heavy metal pollution

Zhang, Min; Zhang, Teng; Zhou, Lei; Lou, Wei; Zeng, Weiai; Liu, Tianbo; Yin, Huaqun; Liu, Hongwei; Liu, Xueduan; Mathivanan, Krishnamurthy; Praburaman, Loganathan; Meng, Delong

doi:10.1016/j.envres.2022.113576

Cited by 84 publications

(26 citation statements)

References 71 publications

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“…HMs contamination creates highly selective stress on the microbial community ( Laplante et al, 2013 ). The microbial community assembly tends to be more deterministic with increasing concentrations of HMs ( Zhang et al, 2022 ). However, our results show that the bacterial community assembly at the L and M levels tended to be deterministic, whereas the bacterial community assembly tended to be stochastic at the H level.…”

Section: Discussionmentioning

confidence: 99%

Structural and functional characteristics of soil microbial communities in response to different ecological risk levels of heavy metals

Chen

Zhang

et al. 2022

Front. Microbiol.

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ObjectiveThe potential ecological risk index (RI) is the most commonly used method to assess heavy metals (HMs) contamination in soils. However, studies have focused on the response of soil microorganisms to different concentrations, whereas little is known about the responses of the microbial community structures and functions to HMs at different RI levels.MethodsHere, we conducted soil microcosms with low (L), medium (M) and high (H) RI levels, depending on the Pb and Cd concentrations, were conducted. The original soil was used as the control (CK). High-throughput sequencing, qPCR, and Biolog plate approaches were applied to investigate the microbial community structures, abundance, diversity, metabolic capacity, functional genes, and community assembly processes.ResultThe abundance and alpha diversity indices for the bacteria at different RI levels were significantly lower than those of the CK. Meanwhile, the abundance and ACE index for the fungi increased significantly with RI levels. Acidobacteria, Basidiomycota and Planctomycetes were enriched as the RI level increased. Keystone taxa and co-occurrence pattern analysis showed that rare taxa play a vital role in the stability and function of the microbial community at different RI levels. Network analysis indicates that not only did the complexity and vulnerability of microbial community decrease as risk levels increased, but that the lowest number of keystone taxa was found at the H level. However, the microbial community showed enhanced intraspecific cooperation to adapt to the HMs stress. The Biolog plate data suggested that the average well color development (AWCD) reduced significantly with RI levels in bacteria, whereas the fungal AWCD was dramatically reduced only at the H level. The functional diversity indices and gene abundance for the microorganisms at the H level were significantly lower than those the CK. In addition, microbial community assembly tended to be more stochastic with an increase in RI levels.ConclusionOur results provide new insight into the ecological impacts of HMs on the soil microbiome at different risk levels, and will aid in future risk assessments for Pb and Cd contamination.

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Section: Discussionmentioning

confidence: 99%

Structural and functional characteristics of soil microbial communities in response to different ecological risk levels of heavy metals

Chen

Zhang

et al. 2022

Front. Microbiol.

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“…Chemical stabilization techniques reduce the risk of migration and diffusion of heavy metals in the environment by applying stabilizing materials to convert them from a highly reactive state to a less reactive state (Palansooriya et al, 2020) and are one of the main technical tools for risk management of heavy metalcontaminated soils, which are fast, economical, and efficient. In the practice of stabilization of heavy metal-contaminated soils, different leaching methods can be used, such as the AA method (using nitric sulfate), TCLP method (using acetic acid) (Cui et al, 2018), and DTPA method (using CaCl2-TEA-DTPA slow flush solution) (Zhang et al, 2022), which are used to determine the changes in the concentration of heavy metals in the active state of the soil before and after stabilization. The continuous grading method classifies heavy metals in soil into different active forms according to the extraction order, assesses the remediation effect of heavy metal stabilization in contaminated soil by the changes in the distribution of different heavy metal forms, and then investigates the stabilization mechanism .…”

Section: Factors a Ecting Arsenic Biogeochemical Cycle And Risk Contr...mentioning

confidence: 99%

Biogeochemical behavior and pollution control of arsenic in mining areas: A review

Zou

Huang

et al. 2023

Front. Microbiol.

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Arsenic (As) is one of the most toxic metalloids that possess many forms. As is constantly migrating from abandoned mining area to the surrounding environment in both oxidation and reducing conditions, threatening human health and ecological safety. The biogeochemical reaction of As included oxidation, reduction, methylation, and demethylation, which is closely associated with microbial metabolisms. The study of the geochemical behavior of arsenic in mining areas and the microbial remediation of arsenic pollution have great potential and are hot spots for the prevention and remediation of arsenic pollution. In this study, we review the distribution and migration of arsenic in the mining area, focus on the geochemical cycle of arsenic under the action of microorganisms, and summarize the factors influencing the biogeochemical cycle of arsenic, and strategies for arsenic pollution in mining areas are also discussed. Finally, the problems of the risk control strategies and the future development direction are prospected.

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“…Another possibility is loss from the cells, which would result in a drop in intracellular concentration. The amount of toxicity felt by the organism directly depends on the uptake and reduction in intracellular concentration ( 256 , 257 ).…”

Section: Geographical Distribution Of Metal Toxicity In Cattlementioning

confidence: 99%

A review of important heavy metals toxicity with special emphasis on nephrotoxicity and its management in cattle

Tahir

Alkheraije

2023

Front. Vet. Sci.

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Toxicity with heavy metals has proven to be a significant hazard with several health problems linked to it. Heavy metals bioaccumulate in living organisms, pollute the food chain, and possibly threaten the health of animals. Many industries, fertilizers, traffic, automobile, paint, groundwater, and animal feed are sources of contamination of heavy metals. Few metals, such as aluminum (Al), may be eliminated by the elimination processes, but other metals like lead (Pb), arsenic (As), and cadmium (Ca) accumulate in the body and food chain, leading to chronic toxicity in animals. Even if these metals have no biological purpose, their toxic effects are still present in some form that is damaging to the animal body and its appropriate functioning. Cadmium (Cd) and Pb have negative impacts on a number of physiological and biochemical processes when exposed to sub-lethal doses. The nephrotoxic effects of Pb, As, and Cd are well known, and high amounts of naturally occurring environmental metals as well as occupational populations with high exposures have an adverse relationship between kidney damage and toxic metal exposure. Metal toxicity is determined by the absorbed dosage, the route of exposure, and the duration of exposure, whether acute or chronic. This can lead to numerous disorders and can also result in excessive damage due to oxidative stress generated by free radical production. Heavy metals concentration can be decreased through various procedures including bioremediation, pyrolysis, phytoremediation, rhizofiltration, biochar, and thermal process. This review discusses few heavy metals, their toxicity mechanisms, and their health impacts on cattle with special emphasis on the kidneys.

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Soil microbial community assembly model in response to heavy metal pollution

Cited by 84 publications

References 71 publications

Structural and functional characteristics of soil microbial communities in response to different ecological risk levels of heavy metals

Structural and functional characteristics of soil microbial communities in response to different ecological risk levels of heavy metals

Biogeochemical behavior and pollution control of arsenic in mining areas: A review

A review of important heavy metals toxicity with special emphasis on nephrotoxicity and its management in cattle

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