Biogeography, assembly processes and species coexistence patterns of microbial communities in metalloids-laden soils around mining and smelting sites

Liu, Bang; Yao, Jun; Chen, Zhihui; Ma, Bo; Li, Hao; Pang, Wancheng; Liu, Jianli; Wang, Daya; Duran, Robert

doi:10.1016/j.jhazmat.2021.127945

Cited by 31 publications

(10 citation statements)

References 57 publications

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“…Stochastic processes indicate an equal chance of dispersal for each species and are mainly dominated by homogenizing dispersal, dispersal limitation, and ecological drift ( 34 ). Contrary to our first hypothesis, deterministic processes are more important in shaping diazotrophic β-diversity, and the application of the iCAMP model revealed that stochastic processes (e.g., dispersal limitation and ecological drift), rather than deterministic processes (e.g., heterogeneous and homogeneous selection), play a dominant role in shaping the potential diazotrophic community assembly of alpine soils ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…According to the contemporary coexistence theory derived from macroecology, the community β-diversity pattern is shaped by a combination of factors, including the species pool, community assembly, and co-occurrence patterns ( 9 , 10 , 34 ). However, in the present study, the species pool contributed little to the biogeographic patterns of the alpine soil potential diazotrophic communities ( Fig.…”

Section: Discussionmentioning

confidence: 99%

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Effect of aridity on the β-diversity of alpine soil potential diazotrophs: insights into community assembly and co-occurrence patterns

Lei,

Wang,

Wang

et al. 2024

mSystems

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Microbial diversity plays a vital role in the maintenance of ecosystem functions. However, the current understanding of mechanisms that shape microbial diversity along environmental gradients at broad spatial scales is relatively limited, especially for specific functional groups, such as potential diazotrophs. Here, we conducted an aridity-gradient transect survey from 60 sites across the Tibetan Plateau, the largest alpine ecosystem of the planet, to investigate the ecological processes (e.g., local species pools, community assembly processes, and co-occurrence patterns) that underlie the β-diversity of alpine soil potential diazotrophic communities. We found that aridity strongly and negatively affected the abundance, richness, and β-diversity of soil diazotrophs. Diazotrophs displayed a distance-decay pattern along the aridity gradient, with organisms living in lower aridity habitats having a stronger distance-decay pattern. Arid habitats had lower co-occurrence complexity, including the number of edges and vertices, the average degree, and the number of keystone taxa, as compared with humid habitats. Local species pools explained limited variations in potential diazotrophic β-diversity. In contrast, co-occurrence patterns and stochastic processes (e.g., dispersal limitation and ecological drift) played a significant role in regulating potential diazotrophic β-diversity. The relative importance of stochastic processes and co-occurrence patterns changed with increasing aridity, with stochastic processes weakening whereas that of co-occurrence patterns enhancing. The genera Geobacter and Paenibacillus were identified as keystone taxa of co-occurrence patterns that are associated with β-diversity. In summary, aridity affects the co-occurrence patterns and community assembly by regulating soil and vegetation characteristics and ultimately shapes the β-diversity of potential diazotrophs. These findings highlight the importance of co-occurrence patterns in structuring microbial diversity and advance the current understanding of mechanisms that drive belowground communities. IMPORTANCE Recent studies have shown that community assembly processes and species pools are the main drivers of β-diversity in grassland microbial communities. However, co-occurrence patterns can also drive β-diversity formation by influencing the dispersal and migration of species, the importance of which has not been reported in previous studies. Assessing the impact of co-occurrence patterns on β-diversity is important for understanding the mechanisms of diversity formation. Our study highlights the influence of microbial co-occurrence patterns on β-diversity and combines the drivers of community β-diversity with drought variation, revealing that drought indirectly affects β-diversity by influencing diazotrophic co-occurrence patterns and community assembly.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of aridity on the β-diversity of alpine soil potential diazotrophs: insights into community assembly and co-occurrence patterns

Lei,

Wang,

Wang

et al. 2024

mSystems

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“…Therefore, higher abundances of Methylomirabilota and MBNT15 were observed in the wet meadow, where the humidity was higher than in the meadow and steppe. The network analysis of bacteria has been shown to be an important way of exploring bacterial co‐occurrence patterns, where highly connected bacterial taxa play important parts in ecosystem function (Liu et al, 2022). In this study, the most abundant bacterial phyla in the co‐occurrence network were Proteobacteria , Acidobacteriota , and Actinobacteriota , suggesting that these dominant bacteria played critical roles in different grassland types, and can adapt to various environments (Wang et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Driving factors of soil bacterial biogeographical distribution in three alpine grassland types

et al. 2023

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The biogeographic distribution of plants and animals on the Qinghai–Tibetan Plateau (QTP) has been extensively studied; however, the biogeographic patterns and factors affecting bacterial communities in alpine grassland ecosystems over large scales were not fully understood. In this paper, we explored the biogeographic patterns of soil bacterial communities in wet meadow, meadow, and steppe. The results showed that bacterial α‐diversity was similar in the three grassland types, while bacterial β‐diversity differed significantly. The dominant bacteria were Proteobacteria (29.86%), Acidobacteriota (17.76%), and Actinobacteriota (16.42%), which were caused by the changes in soil pH, C/N, and soil moisture. In addition, the significant distance–decay of bacterial communities was found across environmental and geographical distances. Partial Mantel test showed that the differences of bacterial community in wet meadow and meadow were influenced by environmental and geographical factors, while the difference of bacterial community in steppe was only affected by geographical distance. The MRM accounted for 38.7%, 37.2%, and 11.8% of the variability in wet meadow, meadow, and steppe, respectively. In wet meadow and meadow, geographic distance was the most powerful factor in explaining the similarity of bacterial communities, while soil moisture was the most critical factor in steppe. It was obvious that environmental and geographical factors played different roles in shaping structures of bacterial community in wet meadow, meadow, and steppe, which provided new insights for the effective management of alpine grassland.

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“…As depicted in Figure 3b, the relative abundance of Actinobacteriota decreased in both rhizosphere and non-rhizosphere soils of Poa pratensis after the application of the bacterial solution, similar to Festuca arundinacea. This may be attributed to the decrease in the soil cadmium concentration after the remediation treatment, as the abundance of Actinobacteriota in the soil is positively correlated with the concentration of heavy metals [43]. Actinobacteria, as rhizospheric bacteria, have been widely studied.…”

Section: The Changes In the Relative Abundance Of Bacterial Speciesmentioning

confidence: 99%

Microbiological Mechanisms of Collaborative Remediation of Cadmium-Contaminated Soil with Bacillus cereus and Lawn Plants

Zhou,

Yang,

Chen

et al. 2024

Plants

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Severe cadmium contamination poses a serious threat to food security and human health. Plant–microbial combined remediation represents a potential technique for reducing heavy metals in soil. The main objective of this study is to explore the remediation mechanism of cadmium-contaminated soil using a combined approach of lawn plants and microbes. The target bacterium Bacillus cereus was selected from cadmium-contaminated soil in mining areas, and two lawn plants (Festuca arundinacea A‘rid III’ and Poa pratensis M‘idnight II’) were chosen as the target plants. We investigated the remediation effect of different concentrations of bacterial solution on cadmium-contaminated soil using two lawn plants through pot experiments, as well as the impact on the soil microbial community structure. The results demonstrate that Bacillus cereus promotes plant growth, and the combined action of lawn plants and Bacillus cereus improves soil quality, enhancing the bioavailability of cadmium in the soil. At a bacterial suspension concentration of 105 CFU/mL, the optimal remediation treatment was observed. The removal efficiency of cadmium in the soil under Festuca arundinacea and Poa pratensis treatments reached 33.69% and 33.33%, respectively. Additionally, the content of bioavailable cadmium in the rhizosphere soil increased by up to 13.43% and 26.54%, respectively. Bacillus cereus increased the bacterial diversity in the non-rhizosphere soil of both lawn plants but reduced it in the rhizosphere soil. Additionally, the relative abundance of Actinobacteriota and Firmicutes, which have potential for heavy metal remediation, increased after the application of the bacterial solution. This study demonstrates that Bacillus cereus can enhance the potential of lawn plants to remediate cadmium-contaminated soil and reshape the microbial communities in both rhizosphere and non-rhizosphere soils.

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Biogeography, assembly processes and species coexistence patterns of microbial communities in metalloids-laden soils around mining and smelting sites

Cited by 31 publications

References 57 publications

Effect of aridity on the β-diversity of alpine soil potential diazotrophs: insights into community assembly and co-occurrence patterns

Effect of aridity on the β-diversity of alpine soil potential diazotrophs: insights into community assembly and co-occurrence patterns

Driving factors of soil bacterial biogeographical distribution in three alpine grassland types

Microbiological Mechanisms of Collaborative Remediation of Cadmium-Contaminated Soil with Bacillus cereus and Lawn Plants

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