Effects of contamination of single and combined cadmium and mercury on the soil microbial community structural diversity and functional diversity

Xie, Xin; Liao, Min; Ma, Aili; Zhang, Haijun

doi:10.1007/s11631-011-0521-7

Cited by 20 publications

(14 citation statements)

References 28 publications

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“…There was no significant difference in AWCD following day 7; hence, the OD 590 was taken to reflect the total carbon metabolism of all soil microbes. Thus, AWCD was calculated according to equation (1) index D [25] and McIntosh index U [26] were calculated to reflect the soil microbial diversity as given in Equations (2)- (4):…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Land Use on Soil Bacterial Functional Diversity in Sanjiang Plain, Northeast China

Wang¹,

Sui²,

Zhang³

et al. 2017

JRST

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ABSTRACT:To investigate the bacterial functional diversity regarding soil carbon metabolism in Sanjiang Plain wetlands, the top soils (0-20 cm) of three different land use types were collected in Sanjiang Plain, China. The distribution and variation of carbon source utilization was assessed by the Biolog microplate method. The results showed that the physicochemical properties of the soil were significantly different between the three land use types, wetland, farmland and forest (P < 0.05). The Average Well Color Development (AWCD) of all samples increased with incubation time, whereby the values of AWCD were highest in soil samples from wetland and lowest from forest. The soil bacterial diversity differed significantly between the three different soil types, and the McIntosh and Shannon-Wiener diversity index was significantly lower for forest soil. This shows that the bacterial community structures were influenced by soil physicochemical properties, with the AWCD and diversity index decreasing from wetlands to farmlands to forests. The utilization of six categories of carbon sources by soil bacteria showed significant differences for carbohydrates, polymers and carboxylic acids, but not for phenolic acids, amino acids and amines (P > 0.05). Principal component analysis (PCA) indicated that soil bacterial carbon utilization revealed obvious spatial variation, suggesting the bacterial metabolism diversity could be reflected in the use of carbohydrates, amino acids and carboxylic acids, particularly carbohydrates. In addition, soil physicochemical properties and vegetation composition were important factors modifying soil bacterial composition and functional activity in different land use types.

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Section: Discussionmentioning

confidence: 99%

Effects of Different Land Use on Soil Bacterial Functional Diversity in Sanjiang Plain, Northeast China

Wang¹,

Sui²,

Zhang³

et al. 2017

JRST

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“…Earlier work shows that salinity and trace metals generate significant changes in microbial community composition (Baker and Banfield, 2003;Feris et al, 2003;Giller et al, 2009;Auguet et al, 2010;Lami et al, 2013). A number of studies have found that Cd and Zn in particular alter microbial community composition (Ganguly and Jana, 2002;Sverdrup et al, 2006;Bouskill et al, 2010;Xie et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Bacterial community responses to a gradient of alkaline mountaintop mine drainage in Central Appalachian streams

2014

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Microbial community composition and diversity change along chemical gradients, leading to the expectation that microbial community information might provide new gradient characterizations. Here we examine stream bacteria composition and diversity along a strong chemical gradient in Central Appalachian streams. Coal mining in the region generates alkaline mine drainage (AlkMD), causing dramatic increases in conductivity, alkalinity, sulfate and metals sufficient to degrade stream macrobiota communities throughout the ecoregion. In this study, we examined the relationship between water and biofilm chemistry and biofilm bacteria taxonomic composition in streams where active and reclaimed surface coal mines occupied 0-96% of watershed surface area. We incubated wood veneers in each stream site for 4 months to develop biofilms on similar substrates. We sampled water chemistry at the time of deployment and collection, and after 1 month. Following incubation, we collected biofilms for microbial and chemical characterization. Microbial composition was determined by pyrosequencing 16S rRNA amplicons. Biofilm subsamples were analyzed by inductively coupled plasma mass spectrometry to determine metal concentrations. Our results show that microbial community composition differed significantly between AlkMD-exposed and AlkMD-unexposed sites, and that compositional dissimilarity increased with AlkMD loading. Diversity was not correlated with pH or extent of upstream mining, but instead correlated with biofilm concentrations of Cd, Mn, Zn and Ni. Within mined sites, the extent of upstream mining was negatively correlated with taxonomic richness. Despite major compositional shifts, functional capacity predicted with PICRUSt (Phylogenetic Investigation of Communities by Reconstruction of Unobserved States) correlated with mining in only 3 of 43 level-2 KEGG (Kyoto Encyclopedia of Genes and Genomes) Orthology groups.

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“…The authors reasoned that the filamentous nature of fungi and actinomycetes would increase their exposure to, and thus susceptibility to, environmental toxins such as heavy metals. Other authors using the same technique have reported increases in Gram positive bacteria in response to Cd2829.…”

Section: Discussionmentioning

confidence: 74%

“…These effects are attributed to Cd toxicity inducing cellular survival mechanisms that divert C from growth-related processes, reducing the amount of C incorporated into microbial biomass28. Observations that Cd toxicity also reduce microbial carbon-use efficiency corroborate this hypothesis29.…”

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confidence: 77%

Microbial community dynamics in the rhizosphere of a cadmium hyper-accumulator

Wood

Zhang

Mathews

et al. 2016

Sci Rep

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Phytoextraction is influenced by the indigenous soil microbial communities during the remediation of heavy metal contaminated soils. Soil microbial communities can affect plant growth, metal availability and the performance of phytoextraction-assisting inocula. Understanding the basic ecology of indigenous soil communities associated with the phytoextraction process, including the interplay between selective pressures upon the communities, is an important step towards phytoextraction optimization. This study investigated the impact of cadmium (Cd), and the presence of a Cd-accumulating plant, Carpobrotus rossii (Haw.) Schwantes, on the structure of soil-bacterial and fungal communities using automated ribosomal intergenic spacer analysis (ARISA) and quantitative PCR (qPCR). Whilst Cd had no detectable influence upon fungal communities, bacterial communities underwent significant structural changes with no reduction in 16S rRNA copy number. The presence of C. rossii influenced the structure of all communities and increased ITS copy number. Suites of operational taxonomic units (OTUs) changed in abundance in response to either Cd or C. rossii, however we found little evidence to suggest that the two selective pressures were acting synergistically. The Cd-induced turnover in bacterial OTUs suggests that Cd alters competition dynamics within the community. Further work to understand how competition is altered could provide a deeper understanding of the microbiome-plant-environment and aid phytoextraction optimization.

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Effects of contamination of single and combined cadmium and mercury on the soil microbial community structural diversity and functional diversity

Cited by 20 publications

References 28 publications

Effects of Different Land Use on Soil Bacterial Functional Diversity in Sanjiang Plain, Northeast China

Effects of Different Land Use on Soil Bacterial Functional Diversity in Sanjiang Plain, Northeast China

Bacterial community responses to a gradient of alkaline mountaintop mine drainage in Central Appalachian streams

Microbial community dynamics in the rhizosphere of a cadmium hyper-accumulator

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