Influence of Heavy Metals on Methane Oxidation in Tropical Rice Soils

Mohanty, SK; Kollah, Bharati; Deepa, N.; Rao, V. R.; Adhya, T. K.

doi:10.1006/eesa.2000.1963

Cited by 42 publications

(20 citation statements)

References 27 publications

(19 reference statements)

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“…Thus, by adjusting the bed copper concentration, it is possible, in various cases, to develop a medium rich in bacteria of types I or II (Wise et al 1999;Erwin et al 2005). It has also been noted that, in adding around 0.02 g of copper, in the form of CuCl 2 , per kg of paddy soil, CH 4 oxidation is slightly stimulated (an increase of around 5%) (Mohanty et al 2000).…”

Section: Nutrientsmentioning

confidence: 97%

Elimination of methane generated from landfills by biofiltration: a review

Nikiema

Brzeziński

Heitz

2007

Rev Environ Sci Biotechnol

131

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The production of biogas in landfills, its composition and the problems resulting from its generation are all reviewed. Biofiltration is a promising option for the control of emissions to atmosphere of the methane contained in biogas issued from the smaller and/or older landfills. A detailed review of the methane biofiltration literature is presented. The microorganisms, mainly the methanotrophs, involved in the methane biodegradation process, and their needs in terms of oxygen and carbon dioxide utilization, are described. Moreover, the influence of nutrients such as copper, nitrogen and phosphorus, and the process operating conditions such as temperature, pH and moisture content of the biofilter bed, are also presented. Finally, the performance of various filter beds, in terms of their elimination capacities, is presented for laboratory scale biofilters and landfill covers.

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Section: Nutrientsmentioning

confidence: 97%

Elimination of methane generated from landfills by biofiltration: a review

Nikiema

Brzeziński

Heitz

2007

Rev Environ Sci Biotechnol

131

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“…Methanotrophs play an important role in reducing CH 4 emissions from soil ecosystems to the atmosphere (Groot et al 2003). However, methanotrophs are one microbial group that is sensitive not only to soil environmental conditions, such as temperature and water content (Einola et al 2007), but also to contaminants including pesticides (Prieme and Ekelund 2001), aluminum (Tamai et al 2007), and heavy metals (Mohanty et al 2000). Assessing the ecotoxicological impacts of contaminants to methanotrophs will be essential for better protection of soil ecosystems.…”

Section: )mentioning

confidence: 99%

Pyrene effects on methanotroph community and methane oxidation rate, tested by dose–response experiment and resistance and resilience experiment

2010

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Purpose Methanotrophs are an important group of bacteria that can metabolize methane. Polycyclic aromatic hydrocarbons (PAHs) are widespread contaminants and present in all ecosystems. We hypothesize that PAHs may affect methanotrophs and methane oxidation. In this study, we assessed dose-response curves for the inhibition of methane oxidation and methanotrophs diversity by pyrene, and resistance and resilience of soil methane oxidation rate and methanotrophs composition in response to pyrene contamination. Material and methods Methanotrophic bacterial diversity was determined by terminal restriction fragment length polymorphism analysis of the pmoA gene, while methanotrophs composition was assessed by cloning and sequencing of the pmoA gene. Sequences with 98% or more identity were considered as the same operational taxonomic unit (OTU). The pyrene concentration at which methane oxidation decreased by 50%, as compared to the non-spiked control soil (EC 50 ), was determined. Both EC 50 concentration and 500 mgkg −1 of pyrene were applied as disturbances in the resistance and resilience experiment. Resistance and resilience were determined 1 and 40 days, respectively, after spiking pyrene.Results and discussion Methane oxidation rate decreased with increasing pyrene concentrations and the EC 50 value was 22.0 mgkg −1 . Methanotrophic bacterial community diversity decreased in 200 and 500 mgkg −1 pyrene treatments, and methanotroph community structure shifts occurred in 100, 200, and 500 mgkg −1 pyrene treatments. Methane oxidation was neither resistant nor resilient to pyrene disturbance. However, methane oxidation of soil with 22.0 mgkg −1 pyrene disturbance recovered to some extent after 40 days incubation. There were five OTUs identified in the control samples, but the number of OTUs increased 1 day after the addition of 22 mgkg −1 of pyrene. It suggests that a low level of disturbance may increase diversity. Forty days after 500 mgkg −1 of pyrene disturbance, only one OTU belonging to Methylocaldum was detected. The resilience of Methylocaldum to a high level of pyrene could be due to the high genomic GC content, which reduces the frequency of insertion by pyrene into the DNA duplex. In addition, we found that the number of OTUs decreased in all treatments after the 40-day incubation. Conclusions Methane oxidation activity was more sensitive to pyrene than the methanotroph community structure, but could recover under a low level of pyrene. Significant decrease in diversity and shift in species composition occurred only after severe perturbation. A low level of disturbance could increase biodiversity, while a high level of disturbance could decrease it.

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“…The irrigation water from the rivers is influenced by domestic, industrial and food growing practices (20), with the later ones often leading to increase the prevalence of heavy metals in the environment (15).…”

Section: Introductionmentioning

confidence: 99%

Bacterial diversity in rice-field water in Rio Grande do Sul

Reche

Fiúza

2005

Braz. J. Microbiol.

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Bacteria are the most diverse living beings on earth and only a fraction of them have been identified. This paper aims at the analysis of the diversity of mesophilic and heterotrophic bacteria found in samples of irrigation water from rice-fields areas in Rio Grande do Sul State, Brazil. Sample collection was carried out in five rice crop regions areas and followed by isolation, multiplication and bacterial characterization. The species' identification was based on biochemical tests (API-System, bioMérieux). Bacterial diversity was determined by the Shannon & Weaner and Pielou index. The results regarding bacterial diversity revealed 26 species. The most abundant representatives belonged to the Bacillus, Corynebacterium, Staphylococcus and Lactobacillus genera, homogeneously distributed in all studied rice crop areas, and in those areas corresponding to the irrigation channel and the rice growing plot as well. The water of the irrigation channel showed the greatest diversity (H'= 1.00) when compared to the plot (H'= 0.77). The channel also presented a more even species distribution (e = 0.73), while the plot (e = 0.59) had the greatest prevalence represented by the Bacillus genus. The areas and the cultivation phases did not significantly affect the bacterial diversity in the study areas (F4,12=1.04; P>0.05). The results showed that culture management could affect water bacterial populations.

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Influence of Heavy Metals on Methane Oxidation in Tropical Rice Soils

Cited by 42 publications

References 27 publications

Elimination of methane generated from landfills by biofiltration: a review

Elimination of methane generated from landfills by biofiltration: a review

Pyrene effects on methanotroph community and methane oxidation rate, tested by dose–response experiment and resistance and resilience experiment

Bacterial diversity in rice-field water in Rio Grande do Sul

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