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León Ninin JM, Higa Mori A, Pausch J, Planer-Friedrich B. Long-term paddy use influences response of methane production, arsenic mobility and speciation to future higher temperatures. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 943:173793. [PMID: 38851333 DOI: 10.1016/j.scitotenv.2024.173793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 05/14/2024] [Accepted: 06/03/2024] [Indexed: 06/10/2024]
Abstract
Anaerobic microbial metabolisms make flooded paddy soils a major source of the greenhouse gas methane (CH4) and mobilize toxic arsenic (As), threatening rice production and consumption. Increasing temperatures due to climate change enhance these microbially mediated processes, increasing their related threats. Chronosequence studies show that long-term paddy use ("age") changes soil properties and redox biogeochemistry through soil organic carbon (SOC) accumulation, its association to amorphous iron (Fe) phases, and increased microbial activity. Using paddy and non-paddy soils from a chronosequence as proxies of soil development and incubating them at different temperatures, we show that paddy soil age influences the response of paddies to changes in temperature. Older paddies showed up to a 6-fold higher CH4 production with increasing temperature, compared to a 2-fold increase in young ones. Contrarily, changes in As mobility were higher in non-paddies and young paddies due to a lack of Fe-SOC-sorption sites. Temperature increased the formation of phytotoxic methylated As in all paddies, posing a risk for rice production. Mitigation strategies for future maintenance, abandonment, or management of paddy soils should include the consideration that history of use shapes the soils' biogeochemistry and microbiology and can influence the response of paddy soils to future temperature increases.
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Affiliation(s)
- José M León Ninin
- Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - Alejandra Higa Mori
- Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - Johanna Pausch
- Agroecology, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
| | - Britta Planer-Friedrich
- Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany.
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2
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Zhang L, Lin W, Sardans J, Li X, Hui D, Yang Z, Wang H, Lin H, Wang Y, Guo J, Peñuelas J, Yang Y. Soil warming-induced reduction in water content enhanced methane uptake at different soil depths in a subtropical forest. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:171994. [PMID: 38561130 DOI: 10.1016/j.scitotenv.2024.171994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 02/05/2024] [Accepted: 03/24/2024] [Indexed: 04/04/2024]
Abstract
Global warming can significantly impact soil CH4 uptake in subtropical forests due to changes in soil moisture, temperature sensitivity of methane-oxidizing bacteria (MOB), and shifts in microbial communities. However, the specific effects of climate warming and the underlying mechanisms on soil CH4 uptake at different soil depths remain poorly understood. To address this knowledge gap, we conducted a soil warming experiment (+4 °C) in a natural forest. From August 2020 to October 2021, we measured soil temperature, soil moisture, and CH4 uptake rates at four different soil depths: 0-10 cm, 10-20 cm, 20-40 cm, and 40-60 cm. Additionally, we assessed the soil MOB community structure and pmoA gene (with qPCR) at the 0-10 and 10-20 cm depths. Our findings revealed that warming significantly enhanced soil net CH4 uptake rate by 12.28 %, 29.51 %, and 61.05 % in the 0-10, 20-40, and 40-60 cm soil layers, respectively. The warming also led to reduced soil moisture levels, with more pronounced reductions observed at the 20-40 cm depth compared to the 0-20 cm depth. At the 0-10 cm depth, warming increased the relative abundance of upland soil cluster α (a type of MOB) and decreased the relative abundance of Methylocystis, but it did not significantly increase the pmoA gene copies. Our structural equation model analysis indicated that warming directly regulated soil CH4 uptake rate through the decrease in soil moisture, rather than through changes in the pmoA gene and MOB community structure at the 0-20 cm depth. In summary, our results demonstrate that warming enhances soil CH4 uptake at different depths, with soil moisture playing a crucial role in this process. Under warming conditions, the drier soil pores allow for better CH4 penetration, thereby promoting more efficient activity of MOB.
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Affiliation(s)
- Lei Zhang
- Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350117, China
| | - Weisheng Lin
- Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Fujian normal University, Sanming 365002, China.
| | - Jordi Sardans
- CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, Barcelona 08193, Catalonia, Spain; CREAF, Cerdanyola del Vallès, Barcelona 08193, Catalonia, Spain
| | - Xiaoling Li
- Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350117, China
| | - Dafeng Hui
- Department of Biological Sciences, Tennessee State University, Nashville, TN 37209, USA
| | - Zhijie Yang
- Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Fujian normal University, Sanming 365002, China
| | - Haizhen Wang
- Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350117, China
| | - Hao Lin
- Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350117, China
| | - Yufang Wang
- College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, Gansu Province, China
| | - Jianfen Guo
- Fujian Provincial Key Laboratory for Plant Eco-physiology, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Fujian normal University, Sanming 365002, China.
| | - Josep Peñuelas
- CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, Barcelona 08193, Catalonia, Spain; CREAF, Cerdanyola del Vallès, Barcelona 08193, Catalonia, Spain
| | - Yusheng Yang
- Institute of Geography, Fujian Normal University, Fuzhou 350117, China; Fujian Sanming Forest Ecosystem National Observation and Research Station, Fujian normal University, Sanming 365002, China
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3
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Xiong J, Wang G, Sun X, Hu Z, Li Y, Sun J, Zhang W, Sun S. Effects of litter and root inputs on soil CH 4 uptake rates and associated microbial abundances in natural temperature subalpine forests. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168730. [PMID: 38007118 DOI: 10.1016/j.scitotenv.2023.168730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 11/17/2023] [Accepted: 11/18/2023] [Indexed: 11/27/2023]
Abstract
Climate change altered the quantities of aboveground plant litter and root inputs, but the effects on soil CH4 uptake rates and underlying mechanisms remain unclear. To investigate these factors, a three-year detritus input and removal treatment (DIRT) study including six treatments (namely, CK, control; NL, litter removal; DL, double litter; NR, root exclusion; NRNL, root exclusion plus litter removal; and NRDL, root exclusion plus double litter) was conducted in broadleaf and coniferous forest subalpine forest ecosystems. The results showed that both the subalpine forest soils acted as sink for atmospheric CH4 across all treatments, while the broadleaf forest had consistently higher CH4 uptake rates than the coniferous forest. Based on the annual mean values, root exclusion (NR, NRNL and NRDL) significantly decreased soil CH4 uptake rates by 35.9 %, 31.0 % and 43.4 % in the broadleaf forest and 36.7 %, 31.9 % and 40.6 % in the coniferous forest compared with CK treatments, respectively. Meanwhile, the mean soil CH4 uptake rates were significantly reduced by 23.6 % and 17.3 % in the broadleaf forest and the coniferous forest under the DL treatments, respectively; nevertheless, the NL treatment significantly increased soil CH4 uptake rates by 19.68 % and 14.4 %, respectively. The results clearly demonstrated that root exclusion exerted a greater influence on soil CH4 uptake rates than plant litter manipulations. Correlation and redundancy analysis (RDA) revealed that the separation of root exclusion treatments from aboveground plant litter manipulations was based on higher soil water content, NH4+-N and NO3--N concentrations, and lower DOC (dissolved organic carbon) concentrations and methanotroph pmoA gene abundance. The results suggest that future alterations in aboveground plant litter and root input, particularly a reduction in root input, can exert a stronger influence on regulating soil CH4 uptake than aboveground litter manipulations in subalpine forests with cold and humid climatic conditions in response to future climate scenarios.
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Affiliation(s)
- Jia Xiong
- Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China; State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| | - Genxu Wang
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| | - Xiangyang Sun
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| | - Zhaoyong Hu
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| | - Yang Li
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| | - Juying Sun
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| | - Wei Zhang
- School of Agriculture, Forestry and Food Engineering, Yibin University, Yibin 644000, China
| | - Shouqin Sun
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China.
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Sánchez-Rodríguez J, Ortega T, Sierra A, Mestre M, Ponce R, Fernández-Puga MC, Forja J. Distribution, reactivity and vertical fluxes of methane in the Guadalquivir Estuary (SW Spain). THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:167758. [PMID: 37832660 DOI: 10.1016/j.scitotenv.2023.167758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 09/18/2023] [Accepted: 10/10/2023] [Indexed: 10/15/2023]
Abstract
The influence of temperature, salinity, sediment-water-atmosphere exchanges and oxidation rate on the variability of methane (CH4) in the Guadalquivir Estuary has been studied. The database corresponds to 3 intensive samplings carried out in summer (2021 and 2022) and winter (2022). An increase in CH4 concentration towards the interior of the estuary has been observed, more intense during summer (19-371 nmol L-1). The influence of temperature and salinity on the variability of CH4 concentration is negligible, with contributions below 1 nmol L-1. Water-atmosphere fluxes increase inland in summer (28-574 μmol m-2 d-1), being generally higher than in winter (18-80 μmol m-2 d-1). Similarly, benthic fluxes remain relatively constant in winter (10 ± 6 μmol m-2 d-1) and increase inland in summer (7-212 μmol m-2 d-1). In the innermost station of the estuary, with salinities lower than 1, there is a significant increase in benthic fluxes, with values above 9000 μmol m-2 d-1. CH4 oxidation rates increase towards low salinities, being especially high in summer (489 nmol L-1 d-1). Based on the information obtained, CH4 variability in the Guadalquivir Estuary is mainly controlled by water-atmosphere fluxes, benthic fluxes and oxidation in the water column. The uncertainty associated with the quantification of these processes does not allow an adequate assessment of the influence of lateral inputs, although there is experimental evidence of their importance in the Guadalquivir.
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Affiliation(s)
- J Sánchez-Rodríguez
- Dpto. Química-Física, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 Puerto Real, Cádiz, Andalucía, Spain.
| | - T Ortega
- Dpto. Química-Física, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 Puerto Real, Cádiz, Andalucía, Spain.
| | - A Sierra
- Dpto. Química-Física, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 Puerto Real, Cádiz, Andalucía, Spain.
| | - M Mestre
- Dpto. Química-Física, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 Puerto Real, Cádiz, Andalucía, Spain
| | - R Ponce
- Dpto. Química-Física, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 Puerto Real, Cádiz, Andalucía, Spain.
| | - M C Fernández-Puga
- Dpto. Ciencias de la Tierra, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 Puerto Real, Cádiz, Andalucía, Spain.
| | - J Forja
- Dpto. Química-Física, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 Puerto Real, Cádiz, Andalucía, Spain.
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Zhu X, Deng Y, Liu Y. Methylocystis dominates methane oxidation in glacier foreland soil at elevated temperature. FEMS Microbiol Lett 2024; 371:fnae011. [PMID: 38366911 DOI: 10.1093/femsle/fnae011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 12/01/2023] [Accepted: 02/15/2024] [Indexed: 02/19/2024] Open
Abstract
Methane-oxidizing bacteria (methanotrophs) play an important role in mitigating methane emissions in various ecological environments, including cold regions. However, the response of methanotrophs in these cold environments to extreme temperatures above the in-situ temperature has not been thoroughly explored. Therefore, this study collected soil samples from Longxiazailongba (LXZ) and Qiangyong (QY) glacier forelands and incubated them with 13CH4 at 35°C under different soil water conditions. The active methanotroph populations were identified using DNA stable isotope probing (DNA-SIP) and high throughput sequencing techniques. The results showed that the methane oxidation potential in LXZ and QY glacier foreland soils was significantly enhanced at an unusually high temperature of 35°C during microcosm incubations, where abundant substrate (methane and oxygen) was provided. Moreover, the influence of soil water conditions on this potential was observed. Interestingly, Methylocystis, a type II and mesophilic methanotroph, was detected in the unincubated in-situ soil samples and became the active and dominant methanotroph in methane oxidation at 35°C. This suggests that Methylocystis can survive at low temperatures for a prolonged period and thrive under suitable growth conditions. Furthermore, the presence of mesophilic methanotrophs in cold habitats could have potential implications for reducing greenhouse gas emissions in warming glacial environments.
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Affiliation(s)
- Xinshu Zhu
- Center for the Pan-third Pole Environment, Lanzhou University, Lanzhou 730000, China
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yongcui Deng
- School of Geography, Nanjing Normal University, Nanjing 210023, China
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
| | - Yongqin Liu
- Center for the Pan-third Pole Environment, Lanzhou University, Lanzhou 730000, China
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
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Bedekar AA, Deewan A, Jagtap SS, Parker DA, Liu P, Mackie RI, Rao CV. Transcriptional and metabolomic responses of Methylococcus capsulatus Bath to nitrogen source and temperature downshift. Front Microbiol 2023; 14:1259015. [PMID: 37928661 PMCID: PMC10623323 DOI: 10.3389/fmicb.2023.1259015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 10/10/2023] [Indexed: 11/07/2023] Open
Abstract
Methanotrophs play a significant role in methane oxidation, because they are the only biological methane sink present in nature. The methane monooxygenase enzyme oxidizes methane or ammonia into methanol or hydroxylamine, respectively. While much is known about central carbon metabolism in methanotrophs, far less is known about nitrogen metabolism. In this study, we investigated how Methylococcus capsulatus Bath, a methane-oxidizing bacterium, responds to nitrogen source and temperature. Batch culture experiments were conducted using nitrate or ammonium as nitrogen sources at both 37°C and 42°C. While growth rates with nitrate and ammonium were comparable at 42°C, a significant growth advantage was observed with ammonium at 37°C. Utilization of nitrate was higher at 42°C than at 37°C, especially in the first 24 h. Use of ammonium remained constant between 42°C and 37°C; however, nitrite buildup and conversion to ammonia were found to be temperature-dependent processes. We performed RNA-seq to understand the underlying molecular mechanisms, and the results revealed complex transcriptional changes in response to varying conditions. Different gene expression patterns connected to respiration, nitrate and ammonia metabolism, methane oxidation, and amino acid biosynthesis were identified using gene ontology analysis. Notably, key pathways with variable expression profiles included oxidative phosphorylation and methane and methanol oxidation. Additionally, there were transcription levels that varied for genes related to nitrogen metabolism, particularly for ammonia oxidation, nitrate reduction, and transporters. Quantitative PCR was used to validate these transcriptional changes. Analyses of intracellular metabolites revealed changes in fatty acids, amino acids, central carbon intermediates, and nitrogen bases in response to various nitrogen sources and temperatures. Overall, our results offer improved understanding of the intricate interactions between nitrogen availability, temperature, and gene expression in M. capsulatus Bath. This study enhances our understanding of microbial adaptation strategies, offering potential applications in biotechnological and environmental contexts.
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Affiliation(s)
- Ashwini Ashok Bedekar
- Energy and Biosciences Institute, Materials Research Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - Anshu Deewan
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - Sujit S. Jagtap
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - David A. Parker
- Energy and Biosciences Institute, Materials Research Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Shell Exploration and Production Inc., Westhollow Technology Center, Houston, TX, United States
| | - Ping Liu
- Energy and Biosciences Institute, Materials Research Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Shell Exploration and Production Inc., Westhollow Technology Center, Houston, TX, United States
| | - Roderick I. Mackie
- Energy and Biosciences Institute, Materials Research Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - Christopher V. Rao
- Energy and Biosciences Institute, Materials Research Laboratory, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Champaign, IL, United States
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, United States
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Gou Y, Qin Y, Ouyang C, Zheng W, Jiang C. Research on aerobic oxidation of methane bacteria and its influencing factors in Chongqing central city section of the Yangtze River, China. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2023; 45:6435-6453. [PMID: 37322172 DOI: 10.1007/s10653-023-01631-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 05/23/2023] [Indexed: 06/17/2023]
Abstract
Bacterial communities play an important role in the carbon cycle of freshwater ecosystems. In order to understand the influencing factors of bacterial community in the process of carbon cycle and search for measures to reduce carbon emissions, Chongqing central city section of the Yangtze River and its tributaries were selected to be the study area in this research. High-throughput sequencing was applied to study aerobic oxidation of methane bacteria (MOB) in sampling area. The results showed that there were spatial differences in the community diversity of aerobic MOB in the Yangtze River in central Chongqing. The Shannon index in the sediment (2.389-2.728) was higher than that in the water (1.820-2.458), and the community diversity in the middle reaches of the main river was higher than that in the upstream and the downstream. The aerobic MOB community was mainly dominated by Type II (Methylocystis). Most of operational taxonomic units (OTUs) in the top ten had high homology with MOB from river and lake sediments, and a few OTUs had high homology with MOB from paddy fields, forests and wetland soils. The main environmental factors affecting the community structure of aerobic MOB were NH4+-N, dissolved oxygen (DO), temperature (T, p ≤ 0.001), pH (p ≤ 0.05), methane (CH4) and carbon dioxide (CO2).
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Affiliation(s)
- Yujia Gou
- Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing, 400074, China
- Chongqing Metropolitan College of Science and Technology, Chongqing, 402160, China
| | - Yu Qin
- Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing, 400074, China.
| | - Changyue Ouyang
- Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Wang Zheng
- Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Chengyong Jiang
- Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing, 400074, China
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Vega MAP, Scholes RC, Brady AR, Daly RA, Narrowe AB, Vanzin GF, Wrighton KC, Sedlak DL, Sharp JO. Methane-Oxidizing Activity Enhances Sulfamethoxazole Biotransformation in a Benthic Constructed Wetland Biomat. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:7240-7253. [PMID: 37099683 DOI: 10.1021/acs.est.2c09314] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Ammonia monooxygenase and analogous oxygenase enzymes contribute to pharmaceutical biotransformation in activated sludge. In this study, we hypothesized that methane monooxygenase can enhance pharmaceutical biotransformation within the benthic, diffuse periphytic sediments (i.e., "biomat") of a shallow, open-water constructed wetland. To test this hypothesis, we combined field-scale metatranscriptomics, porewater geochemistry, and methane gas fluxes to inform microcosms targeting methane monooxygenase activity and its potential role in pharmaceutical biotransformation. In the field, sulfamethoxazole concentrations decreased within surficial biomat layers where genes encoding for the particulate methane monooxygenase (pMMO) were transcribed by a novel methanotroph classified as Methylotetracoccus. Inhibition microcosms provided independent confirmation that methane oxidation was mediated by the pMMO. In these same incubations, sulfamethoxazole biotransformation was stimulated proportional to aerobic methane-oxidizing activity and exhibited negligible removal in the absence of methane, in the presence of methane and pMMO inhibitors, and under anoxia. Nitrate reduction was similarly enhanced under aerobic methane-oxidizing conditions with rates several times faster than for canonical denitrification. Collectively, our results provide convergent in situ and laboratory evidence that methane-oxidizing activity can enhance sulfamethoxazole biotransformation, with possible implications for the combined removal of nitrogen and trace organic contaminants in wetland sediments.
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Affiliation(s)
- Michael A P Vega
- Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
- NSF Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Colorado School of Mines, Golden, Colorado 80401, United States
| | - Rachel C Scholes
- NSF Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Colorado School of Mines, Golden, Colorado 80401, United States
- Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, United States
| | - Adam R Brady
- Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
- NSF Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Colorado School of Mines, Golden, Colorado 80401, United States
| | - Rebecca A Daly
- Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Adrienne B Narrowe
- Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Gary F Vanzin
- Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Kelly C Wrighton
- Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado 80523, United States
| | - David L Sedlak
- NSF Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Colorado School of Mines, Golden, Colorado 80401, United States
- Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, United States
| | - Jonathan O Sharp
- Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
- NSF Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Colorado School of Mines, Golden, Colorado 80401, United States
- Hydrologic Science and Engineering Program, Colorado School of Mines, Golden, Colorado 80401, United States
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Zhu X, Deng Y, Hernández M, Fang J, Xing P, Liu Y. Distinct responses of soil methanotrophy in hummocks and hollows to simulated glacier meltwater and temperature rise in Tibetan glacier foreland. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 862:160888. [PMID: 36521618 DOI: 10.1016/j.scitotenv.2022.160888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 12/06/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Glacier foreland soils are known to be essential methane (CH4) consumers. However, global warming and increased glacier meltwater have turned some foreland meadows into swamp meadows. The potential impact of this change on the function of foreland soils in methane consumption remains unclear. Therefore, we collected Tibetan glacier foreland soils in the non-melting season from typical microtopography in swamp meadows (hummock and hollow). Three soil moisture conditions (moist, saturated, and submerged) were set by adding glacier runoff water. Soil samples were then incubated in the laboratory for two weeks at 10 °C and 20 °C. About 5 % of 13CH4/12CH4 was added to the incubation bottles, and daily methane concentrations were measured. DNA stable isotope probing (DNA-SIP) and high-throughput sequencing were combined to target the active methanotroph populations. The results showed that type Ia methanotrophs, including Crenothrix, Methylobacter, and an unclassified Methylomonadaceae cluster, actively oxidized methane at 10 °C and 20 °C. There were distinct responses of methanotrophs to soil moisture rises in hummock and hollow soils, resulting in different methane oxidation potentials. In both hummock and hollow soils, the methane oxidation potential was positively correlated with temperature. Furthermore, saturated hummock soils exhibited the highest methane oxidation potential and methanotroph populations, while submerged hollow soils had the lowest. This suggests that the in-situ hummock soils, generally saturated with water, are more essential than in-situ hollows, typically submerged in water, for alleviating the global warming potential of swamp meadows in the Tibetan glacier foreland during the growing season.
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Affiliation(s)
- Xinshu Zhu
- School of Geography, Nanjing Normal University, Nanjing 210023, China
| | - Yongcui Deng
- School of Geography, Nanjing Normal University, Nanjing 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China.
| | - Marcela Hernández
- School of Biological Sciences, University of East Anglia, Norwich, Norfolk NR4 7TJ, United Kingdom
| | - Jie Fang
- School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China
| | - Peng Xing
- Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yongqin Liu
- Center for the Pan-third Pole Environment, Lanzhou University, Lanzhou 730000, China; State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
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10
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Hermesdorf L, Elberling B, D'Imperio L, Xu W, Lambæk A, Ambus PL. Effects of fire on CO 2 , CH 4 , and N 2 O exchange in a well-drained Arctic heath ecosystem. GLOBAL CHANGE BIOLOGY 2022; 28:4882-4899. [PMID: 35543023 PMCID: PMC9544550 DOI: 10.1111/gcb.16222] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 04/26/2022] [Accepted: 04/27/2022] [Indexed: 06/14/2023]
Abstract
Wildfire frequency and expanse in the Arctic have increased in recent years and are projected to increase further with changes in climatic conditions due to warmer and drier summers. Yet, there is a lack of knowledge about the impacts such events may have on the net greenhouse gas (GHG) balances in Arctic ecosystems. We investigated in situ effects of an experimental fire in 2017 on carbon dioxide (CO2 ), methane (CH4 ), and nitrous oxide (N2 O) surface fluxes in the most abundant tundra ecosystem in West Greenland in ambient and warmer conditions. Measurements from the growing seasons 2017 to 2019 showed that burnt areas became significant net CO2 sources for the entire study period, driven by increased ecosystem respiration (ER) immediately after the fire and decreased gross ecosystem production (GEP). Warming by open-top chambers significantly increased both ER and GEP in control, but not in burnt plots. In contrast to CO2 , measurements suggest that the overall sink capacity of atmospheric CH4 , as well as net N2 O emissions, were not affected by fire in the short term, but only immediately after the fire. The minor effects on CH4 and N2 O, which was surprising given the significantly higher nitrate availability observed in burnt plots. However, the minor effects are aligned with the lack of significant effects of fire on soil moisture and soil temperature. Net uptake and emissions of all three GHG from burnt soils were less temperature-sensitive than in the undisturbed control plots. Overall, this study highlights that wildfires in a typical tundra ecosystem in Greenland may not lead to markedly increased net GHG emissions other than CO2 . Additional investigations are needed to assess the consequences of more severe fires.
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Affiliation(s)
- Lena Hermesdorf
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource ManagementUniversity of CopenhagenCopenhagenDenmark
| | - Bo Elberling
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource ManagementUniversity of CopenhagenCopenhagenDenmark
| | - Ludovica D'Imperio
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource ManagementUniversity of CopenhagenCopenhagenDenmark
- University of Copenhagen, IGN, Section for Forest, Nature and BiomassFrederiksberg CDenmark
| | - Wenyi Xu
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource ManagementUniversity of CopenhagenCopenhagenDenmark
| | - Anders Lambæk
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource ManagementUniversity of CopenhagenCopenhagenDenmark
| | - Per L. Ambus
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource ManagementUniversity of CopenhagenCopenhagenDenmark
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11
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Impact of interannual and multidecadal trends on methane-climate feedbacks and sensitivity. Nat Commun 2022; 13:3592. [PMID: 35739128 PMCID: PMC9226131 DOI: 10.1038/s41467-022-31345-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 06/01/2022] [Indexed: 11/29/2022] Open
Abstract
We estimate the causal contributions of spatiotemporal changes in temperature (T) and precipitation (Pr) to changes in Earth’s atmospheric methane concentration (CCH4) and its isotope ratio δ13CH4 over the last four decades. We identify oscillations between positive and negative feedbacks, showing that both contribute to increasing CCH4. Interannually, increased emissions via positive feedbacks (e.g. wetland emissions and wildfires) with higher land surface air temperature (LSAT) are often followed by increasing CCH4 due to weakened methane sink via atmospheric •OH, via negative feedbacks with lowered sea surface temperatures (SST), especially in the tropics. Over decadal time scales, we find alternating rate-limiting factors for methane oxidation: when CCH4 is limiting, positive methane-climate feedback via direct oceanic emissions dominates; when •OH is limiting, negative feedback is favoured. Incorporating the interannually increasing CCH4 via negative feedbacks gives historical methane-climate feedback sensitivity ≈ 0.08 W m−2 °C−1, much higher than the IPCC AR6 estimate. Record-breaking rates of increasing atmospheric methane concentrations in 2020 and 2021 are alarming, but puzzling, in view of declining methane emissions from fossil fuel in 2020. The authors show that interannual variation of both positive and negative feedbacks contribute positively to the rising methane concentration.
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12
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Meena M, Yadav G, Sonigra P, Nagda A, Mehta T, Swapnil P, Marwal A, Kumar S. Multifarious Responses of Forest Soil Microbial Community Toward Climate Change. MICROBIAL ECOLOGY 2022:10.1007/s00248-022-02051-3. [PMID: 35657425 DOI: 10.1007/s00248-022-02051-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
Forest soils are a pressing subject of worldwide research owing to the several roles of forests such as carbon sinks. Currently, the living soil ecosystem has become dreadful as a consequence of several anthropogenic activities including climate change. Climate change continues to transform the living soil ecosystem as well as the soil microbiome of planet Earth. The majority of studies have aimed to decipher the role of forest soil bacteria and fungi to understand and predict the impact of climate change on soil microbiome community structure and their ecosystem in the environment. In forest soils, microorganisms live in diverse habitats with specific behavior, comprising bulk soil, rhizosphere, litter, and deadwood habitats, where their communities are influenced by biotic interactions and nutrient accessibility. Soil microbiome also drives multiple crucial steps in the nutrient biogeochemical cycles (carbon, nitrogen, phosphorous, and sulfur cycles). Soil microbes help in the nitrogen cycle through nitrogen fixation during the nitrogen cycle and maintain the concentration of nitrogen in the atmosphere. Soil microorganisms in forest soils respond to various effects of climate change, for instance, global warming, elevated level of CO2, drought, anthropogenic nitrogen deposition, increased precipitation, and flood. As the major burning issue of the globe, researchers are facing the major challenges to study soil microbiome. This review sheds light on the current scenario of knowledge about the effect of climate change on living soil ecosystems in various climate-sensitive soil ecosystems and the consequences for vegetation-soil-climate feedbacks.
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Affiliation(s)
- Mukesh Meena
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, 313001, Rajasthan, India.
| | - Garima Yadav
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, 313001, Rajasthan, India
| | - Priyankaraj Sonigra
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, 313001, Rajasthan, India
| | - Adhishree Nagda
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, 313001, Rajasthan, India
| | - Tushar Mehta
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, 313001, Rajasthan, India
| | - Prashant Swapnil
- Department of Botany, School of Biological Science, Central University of Punjab, Bhatinda, Punjab, 151401, India
| | - Avinash Marwal
- Department of Biotechnology, Vigyan Bhawan - Block B, New Campus, Mohanlal Sukhadia University, Udaipur, 313001, Rajasthan, India
| | - Sumit Kumar
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 221005, India
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13
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Lu L, Li X, Li Z, Chen Y, Sabio Y García CA, Yang J, Luo F, Zou X. Aerobic methanotrophs in an urban water cycle system: Community structure and network interaction pattern. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 772:145045. [PMID: 33770879 DOI: 10.1016/j.scitotenv.2021.145045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 12/20/2020] [Accepted: 12/30/2020] [Indexed: 06/12/2023]
Abstract
Aerobic methane-oxidizing bacteria (MOB) play an important role in reducing methane emissions in nature. Most current researches focus on the natural habitats (e.g., lakes, reservoirs, wetlands, paddy fields, etc.). However, methanotrophs and the methane-oxidizing process remain essentially unclear in artificial habitat, such as the urban water cycle systems. Here, high-throughput sequencing and qPCR were used to analyze the community structure and abundance of MOB. Six different systems were selected from Yunyang City, Chongqing, China, including the raw water system (RW), the water supply pipe network system (SP), the wastewater pipe network system (WP), the hospital wastewater treatment system (HP), the municipal wastewater treatment plant system (WT) and the downstream river system (ST) of a wastewater treatment plant. Results clearly showed that the MOB community structure and network interaction patterns of the urban water cycle system were different from those of natural water bodies. Type I MOB was the dominant clade in HP. Methylocysis in Type II was the most abundant genus among the whole urban water cycle system, indicating that this genus had a high adaptability to the environment. Temperature, dissolved oxygen, pH and concentration significantly affected the MOB communities in the urban water cycle system. The network of MOB in WT was the most complicated, and there were competitive relationships among species in WP. The structure of the network in HP was unstable, and therefore, it was vulnerable to environmental disturbances. Methylocystis (Type II) and Methylomonas (Type I) were the most important keystone species in the entire urban water cycle system. Overall, these findings broaden the understanding of the distribution and interaction patterns of MOB communities in an urban water cycle system and provide valuable clues for ecosystem restoration and environmental management.
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Affiliation(s)
- Lunhui Lu
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Xinrui Li
- Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
| | - Zhe Li
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
| | - Yao Chen
- Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
| | - Carmen A Sabio Y García
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Depto. Ecología, Genética y Evolución, Int. Güiraldes 2620, Pabellón II, Ciudad Universitaria, CP 1428 Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Argentina
| | - Jixiang Yang
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Fang Luo
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
| | - Xi Zou
- Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan 430079, PR China
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14
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Mohanty SR, Kumar A, Parmar R, Dubey G, Patra A, Kollah B. Do methanotrophs drive phosphorus mineralization in soil ecosystem? Can J Microbiol 2020; 67:464-475. [PMID: 33301360 DOI: 10.1139/cjm-2020-0254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Experiments were carried out to elucidate linkage between methane consumption and mineralization of phosphorous (P) from different P sources. The treatments were (i) no CH4 + no P amendment (absolute control), (ii) with CH4 + no P amendment (control), (iii) with CH4 + inorganic P as Ca3(PO4)2, and (iv) with CH4 + organic P as sodium phytate. P sources were added at 25 µg P·(g soil)-1. Soils were incubated to undergo three repeated CH4 feeding cycles, referred to as feeding cycle I, feeding cycle II, and feeding cycle III. CH4 consumption rate k (µg CH4 consumed·(g soil)-1·day-1) was 0.297 ± 0.028 in no P amendment control, 0.457 ± 0.016 in Ca3(PO4)2, and 0.627 ± 0.013 in sodium phytate. Rate k was stimulated by 2 to 6 times over CH4 feeding cycles and followed the trend of sodium phytate > Ca3(PO4)2 > no P amendment control. CH4 consumption stimulated P solubilization from Ca3(PO4)2 by a factor of 2.86. Acid phosphatase (µg paranitrophenol released·(g soil)-1·h-1) was higher in sodium phytate than the no P amendment control. Abundance of 16S rRNA and pmoA genes increased with CH4 consumption rates. The results of the study suggested that CH4 consumption drives mineralization of unavailable inorganic and organic P sources in the soil ecosystem.
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Affiliation(s)
- Santosh Ranjan Mohanty
- Indian Institute of Soil Science, Indian Council of Agricultural Research, Berasia Road, Nabibagh, Bhopal 462038, India
| | - Adarsh Kumar
- Indian Institute of Soil Science, Indian Council of Agricultural Research, Berasia Road, Nabibagh, Bhopal 462038, India.,National Bureau of Agriculturally Important Microorganisms, Indian Council of Agricultural Research, Kushmaur, Mau, Uttar Pradesh 275101, India
| | - Rakesh Parmar
- Indian Institute of Soil Science, Indian Council of Agricultural Research, Berasia Road, Nabibagh, Bhopal 462038, India
| | - Garima Dubey
- Indian Institute of Soil Science, Indian Council of Agricultural Research, Berasia Road, Nabibagh, Bhopal 462038, India
| | - Ashok Patra
- Indian Institute of Soil Science, Indian Council of Agricultural Research, Berasia Road, Nabibagh, Bhopal 462038, India
| | - Bharati Kollah
- Indian Institute of Soil Science, Indian Council of Agricultural Research, Berasia Road, Nabibagh, Bhopal 462038, India
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15
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Meyer-Dombard DR, Bogner JE, Malas J. A Review of Landfill Microbiology and Ecology: A Call for Modernization With 'Next Generation' Technology. Front Microbiol 2020; 11:1127. [PMID: 32582086 PMCID: PMC7283466 DOI: 10.3389/fmicb.2020.01127] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 05/05/2020] [Indexed: 12/24/2022] Open
Abstract
Engineered and monitored sanitary landfills have been widespread in the United States since the passage of the Clean Water Act (1972) with additional controls under RCRA Subtitle D (1991) and the Clean Air Act Amendments (1996). Concurrently, many common perceptions regarding landfill biogeochemical and microbiological processes and estimated rates of gas production also date from 2 to 4 decades ago. Herein, we summarize the recent application of modern microbiological tools as well as recent metadata analysis using California, USEPA and international data to outline an evolving view of landfill biogeochemical/microbiological processes and rates. We focus on United States landfills because these are uniformly subject to stringent national and state requirements for design, operations, monitoring, and reporting. From a microbiological perspective, because anoxic conditions and methanogenesis are rapidly established after daily burial of waste and application of cover soil, the >1000 United States landfills with thicknesses up to >100 m form a large ubiquitous group of dispersed 'dark' ecosystems dominated by anaerobic microbial decomposition pathways for food, garden waste, and paper substrates. We review past findings of landfill ecosystem processes, and reflect on the potential impact that application of modern sequencing technologies (e.g., high throughput platforms) could have on this area of research. Moreover, due to the ever evolving composition of landfilled waste reflecting transient societal practices, we also consider unusual microbial processes known or suspected to occur in landfill settings, and posit areas of research that will be needed in coming decades. With growing concerns about greenhouse gas emissions and controls, the increase of chemicals of emerging concern in the waste stream, and the potential resource that waste streams represent, application of modernized molecular and microbiological methods to landfill ecosystem research is of paramount importance.
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Affiliation(s)
- D’Arcy R. Meyer-Dombard
- Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL, United States
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16
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Biocrusts Modulate Responses of Nitrous Oxide and Methane Soil Fluxes to Simulated Climate Change in a Mediterranean Dryland. Ecosystems 2020. [DOI: 10.1007/s10021-020-00497-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Crevecoeur S, Ruiz-González C, Prairie YT, Del Giorgio PA. Large-scale biogeography and environmental regulation of methanotrophic bacteria across boreal inland waters. Mol Ecol 2019; 28:4181-4196. [PMID: 31479544 DOI: 10.1111/mec.15223] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 08/01/2019] [Accepted: 08/06/2019] [Indexed: 01/09/2023]
Abstract
Aerobic methanotrophic bacteria (methanotrophs) use methane as a source of carbon and energy, thereby mitigating net methane emissions from natural sources. Methanotrophs represent a widespread and phylogenetically complex guild, yet the biogeography of this functional group and the factors that explain the taxonomic structure of the methanotrophic assemblage are still poorly understood. Here, we used high-throughput sequencing of the 16S rRNA gene of the bacterial community to study the methanotrophic community composition and the environmental factors that influence their distribution and relative abundance in a wide range of freshwater habitats, including lakes, streams and rivers across the boreal landscape. Within one region, soil and soil water samples were additionally taken from the surrounding watersheds in order to cover the full terrestrial-aquatic continuum. The composition of methanotrophic communities across the boreal landscape showed only a modest degree of regional differentiation but a strong structuring along the hydrologic continuum from soil to lake communities, regardless of regions. This pattern along the hydrologic continuum was mostly explained by a clear niche differentiation between type I and type II methanotrophs along environmental gradients in pH, and methane concentrations. Our results suggest very different roles of type I and type II methanotrophs within inland waters, the latter likely having a terrestrial source and reflecting passive transport and dilution along the aquatic networks, but this is an unresolved issue that requires further investigation.
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Affiliation(s)
- Sophie Crevecoeur
- Département des Sciences Biologiques, Groupe de Recherche Interuniversitaire en Limnologie et en Environnement Aquatique (GRIL), Université du Québec à Montréal, Montréal, QC, Canada
| | - Clara Ruiz-González
- Department of Marine Biology and Oceanography, Institut de Ciències del Mar (ICM-CSIC), Barcelona, Spain
| | - Yves T Prairie
- Département des Sciences Biologiques, Groupe de Recherche Interuniversitaire en Limnologie et en Environnement Aquatique (GRIL), Université du Québec à Montréal, Montréal, QC, Canada
| | - Paul A Del Giorgio
- Département des Sciences Biologiques, Groupe de Recherche Interuniversitaire en Limnologie et en Environnement Aquatique (GRIL), Université du Québec à Montréal, Montréal, QC, Canada
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18
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Zakharenko AS, Galachyants YP, Morozov IV, Shubenkova OV, Morozov AA, Ivanov VG, Pimenov NV, Krasnopeev AY, Zemskaya TI. Bacterial Communities in Areas of Oil and Methane Seeps in Pelagic of Lake Baikal. MICROBIAL ECOLOGY 2019; 78:269-285. [PMID: 30483839 DOI: 10.1007/s00248-018-1299-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 11/20/2018] [Indexed: 06/09/2023]
Abstract
We have assessed the diversity of bacteria near oil-methane (area I) and methane (area II) seeps in the pelagic zone of Lake Baikal using massive parallel sequencing of 16S rRNA, pmoA, and mxaF gene fragments amplified from total DNA. At depths from the surface to 100 m, sequences belonging to Cyanobacteria dominated. In the communities to a depth of 200 m of the studied areas, Proteobacteria dominated the deeper layers of the water column. Alphaproteobacteria sequences were predominant in the community near the oil-methane seep, while the community near the methane seep was characterized by the prevalence of Alpha- and Gammaproteobacteria. Among representatives of these classes, type I methanotrophs prevailed in the 16S rRNA gene libraries from the near-bottom area, and type II methanotrophs were detected in minor quantities at different depths. In the analysis of the libraries of the pmoA and mxaF functional genes, we observed the different taxonomic composition of methanotrophic bacteria in the surface and deep layers of the water column. All pmoA sequences from area I were type II methanotrophs and were detected at a depth of 300 m, while sequences of type I methanotrophs were the most abundant in deep layers of the water column of area II. All mxaF gene sequences belonged to Methylobacterium representatives. Based on comparative analyses of 16S rRNA, pmoA, and mxaF gene fragment libraries, we suggest that there must be a wider spectrum of functional genes facilitating methane oxidation that were not detected with the primers used.
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Affiliation(s)
- Aleksandra S Zakharenko
- Siberian Branch of the Russian Academy of Sciences, Limnological Institute, Ulan-Batorskaya Street 3, 664033, Irkutsk, Russia.
| | - Yuriy P Galachyants
- Siberian Branch of the Russian Academy of Sciences, Limnological Institute, Ulan-Batorskaya Street 3, 664033, Irkutsk, Russia
| | - Igor V Morozov
- Siberian Branch of the Russian Academy of Sciences, Institute of Chemical Biology and Fundamental Medicine, Novosibirsk, Russia
- Novosibirsk State University, Novosibirsk, Russia
| | - Olga V Shubenkova
- Siberian Branch of the Russian Academy of Sciences, Limnological Institute, Ulan-Batorskaya Street 3, 664033, Irkutsk, Russia
| | - Alexey A Morozov
- Siberian Branch of the Russian Academy of Sciences, Limnological Institute, Ulan-Batorskaya Street 3, 664033, Irkutsk, Russia
| | - Vyacheslav G Ivanov
- Siberian Branch of the Russian Academy of Sciences, Limnological Institute, Ulan-Batorskaya Street 3, 664033, Irkutsk, Russia
| | - Nikolay V Pimenov
- Research Center of Biotechnology, Russian Academy of Sciences, Winogradsky Institute of Microbiology, Moscow, Russia
| | - Andrey Y Krasnopeev
- Siberian Branch of the Russian Academy of Sciences, Limnological Institute, Ulan-Batorskaya Street 3, 664033, Irkutsk, Russia
| | - Tamara I Zemskaya
- Siberian Branch of the Russian Academy of Sciences, Limnological Institute, Ulan-Batorskaya Street 3, 664033, Irkutsk, Russia
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19
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Reddy KR, Rai RK, Green SJ, Chetri JK. Effect of temperature on methane oxidation and community composition in landfill cover soil. J Ind Microbiol Biotechnol 2019; 46:1283-1295. [PMID: 31317292 DOI: 10.1007/s10295-019-02217-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 07/11/2019] [Indexed: 11/30/2022]
Abstract
Municipal solid waste (MSW) landfills are the third largest anthropogenic source of methane (CH4) emissions in the United States. The majority of CH4 generated in landfills is converted to carbon dioxide (CO2) by CH4-oxidizing bacteria (MOB) present in the landfill cover soil, whose activity is controlled by various environmental factors including temperature. As landfill temperature can fluctuate substantially seasonally, rates of CH4 oxidation can also vary, and this could lead to incomplete oxidation. This study aims at analyzing the effect of temperature on CH4 oxidation potential and microbial community structure of methanotrophs in laboratory-based studies of landfill cover soil and cultivated consortia. Soil and enrichment cultures were incubated at temperatures ranging from 6 to 70 °C, and rates of CH4 oxidation were measured, and the microbial community structure was analyzed using 16S rRNA gene amplicon sequencing and shotgun metagenome sequencing. CH4 oxidation occurred at temperatures from 6 to 50 °C in soil microcosm tests, and 6-40 °C in enrichment culture batch tests; maximum rates of oxidation were obtained at 30 °C. A corresponding shift in the soil microbiota was observed, with a transition from putative psychrophilic to thermophilic methanotrophs with increasing incubation temperature. A strong shift in methanotrophic community structure was observed above 30 °C. At temperatures up to 30 °C, methanotrophs from the genus Methylobacter were dominant in soils and enrichment cultures; at a temperature of 40 °C, putative thermophilic methanotrophs from the genus Methylocaldum become dominant. Maximum rate measurements of nearly 195 μg CH4 g-1 day-1 were observed in soil incubations, while observed maximum rates in enrichments were significantly lower, likely as a result of diffusion limitations. This study demonstrates that temperature is a critical factor affecting rates of landfill soil CH4 oxidation in vitro and that changing rates of CH4 oxidation are in part driven by changes in methylotroph community structure.
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Affiliation(s)
- Krishna R Reddy
- Department of Civil and Materials Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL, 60607, USA.
| | - Raksha K Rai
- Department of Civil and Materials Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL, 60607, USA
| | - Stefan J Green
- Department of Biological Sciences, Sequencing Core, Resources Center, University of Illinois at Chicago, 835 S. Wolcott, Chicago, IL, 60612, USA
| | - Jyoti K Chetri
- Department of Civil and Materials Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL, 60607, USA
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Crevecoeur S, Vincent WF, Comte J, Matveev A, Lovejoy C. Diversity and potential activity of methanotrophs in high methane-emitting permafrost thaw ponds. PLoS One 2017; 12:e0188223. [PMID: 29182670 PMCID: PMC5705078 DOI: 10.1371/journal.pone.0188223] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 11/02/2017] [Indexed: 11/27/2022] Open
Abstract
Lakes and ponds derived from thawing permafrost are strong emitters of carbon dioxide and methane to the atmosphere, but little is known about the methane oxidation processes in these waters. Here we investigated the distribution and potential activity of aerobic methanotrophic bacteria in thaw ponds in two types of eroding permafrost landscapes in subarctic Québec: peatlands and mineral soils. We hypothesized that methanotrophic community composition and potential activity differ regionally as a function of the landscape type and permafrost degradation stage, and locally as a function of depth-dependent oxygen conditions. Our analysis of pmoA transcripts by Illumina amplicon sequencing and quantitative PCR showed that the communities were composed of diverse and potentially active lineages. Type I methanotrophs, particularly Methylobacter, dominated all communities, however there was a clear taxonomic separation between the two landscape types, consistent with environmental control of community structure. In contrast, methanotrophic potential activity, measured by pmoA transcript concentrations, did not vary with landscape type, but correlated with conductivity, phosphorus and total suspended solids. Methanotrophic potential activity was also detected in low-oxygen bottom waters, where it was inversely correlated with methane concentrations, suggesting methane depletion by methanotrophs. Methanotrophs were present and potentially active throughout the water column regardless of oxygen concentration, and may therefore be resilient to future mixing and oxygenation regimes in the warming subarctic.
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Affiliation(s)
- Sophie Crevecoeur
- Département de Biologie, Centre d’études nordiques (CEN) and Takuvik Joint International Laboratory, Université Laval, Québec, Québec, Canada
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec, Québec, Canada
- * E-mail:
| | - Warwick F. Vincent
- Département de Biologie, Centre d’études nordiques (CEN) and Takuvik Joint International Laboratory, Université Laval, Québec, Québec, Canada
| | - Jérôme Comte
- Département de Biologie, Centre d’études nordiques (CEN) and Takuvik Joint International Laboratory, Université Laval, Québec, Québec, Canada
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec, Québec, Canada
| | - Alex Matveev
- Département de Biologie, Centre d’études nordiques (CEN) and Takuvik Joint International Laboratory, Université Laval, Québec, Québec, Canada
| | - Connie Lovejoy
- Département de Biologie, Centre d’études nordiques (CEN) and Takuvik Joint International Laboratory, Université Laval, Québec, Québec, Canada
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec, Québec, Canada
- Québec-Océan, Université Laval, Québec, Québec, Canada
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21
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Methanotrophic community composition based on pmoA genes in dissolved methane recovery and biological oxidation closed downflow hanging sponge reactors. Biochem Eng J 2017. [DOI: 10.1016/j.bej.2017.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Dubey G, Kollah B, Gour VK, Shukla AK, Mohanty SR. Diversity of bacteria and archaea in the rhizosphere of bioenergy crop Jatropha curcas. 3 Biotech 2016; 6:257. [PMID: 28330329 PMCID: PMC5135702 DOI: 10.1007/s13205-016-0546-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Accepted: 10/11/2016] [Indexed: 11/29/2022] Open
Abstract
Plant-microbial interaction in rhizosphere plays vital role in shaping plant’s growth and ecosystem function. Most of the rhizospheric microbial diversity studies are restricted to bacteria. In natural ecosystem, archaea also constitutes a major component of the microbial population. However, their diversity is less known compared to bacteria. Experiments were carried out to examine diversity of bacteria and archaea in the rhizosphere of bioenergy crop Jatropha curcas (J. curcas). Samples were collected from three locations varying widely in the soil physico-chemical properties. Diversity was estimated by terminal restriction fragment length polymorphism (TRFLP) targeting 16S rRNA gene of bacteria and archaea. Fifteen bacterial and 17 archaeal terminal restriction fragments (TRFs) were retrieved from J. curcas rhizosphere. Bacterial indicative TRFs were Actinobacteria, Firmicutes, Acidobacteria, Verrumicrobiaceae, and Chlroflexi. Major archaeal TRFs were crenarchaeota, and euryarchaeota. In case of bacteria, relative fluorescence was low for TRF160 and high for TRF51, TRF 420. Similarly, for archaea relative fluorescence of TRF 218, and TRF 282 was low and high for TRF 278, TRF468 and TRF93. Principal component analysis (PCA) of bacterial TRFs designated PC 1 with 46.83% of variation and PC2 with 31.07% variation. Archaeal TRFs designated 90.94% of variation by PC1 and 9.05% by PC2. Simpson index varied from 0.530 to 0.880 and Shannon index from 1.462 to 3.139 for bacteria. For archaea, Simpson index varied from 0.855 to 0.897 and Shannon index varied from 3.027 to 3.155. Study concluded that rhizosphere of J. curcas constituted of diverse set of both bacteria and archaea, which might have promising plant growth promoting activities.
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Affiliation(s)
- Garima Dubey
- Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
| | - Bharati Kollah
- Indian Institute of Soil Science, Nabibagh, Bhopal, 462038, India
| | - Vijay Kumar Gour
- Department of Plant Breeding and Genetics, J.N. Agricultural University, Krishinagar, Jabalpur, 482004, India
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Malyan SK, Bhatia A, Kumar A, Gupta DK, Singh R, Kumar SS, Tomer R, Kumar O, Jain N. Methane production, oxidation and mitigation: A mechanistic understanding and comprehensive evaluation of influencing factors. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 572:874-896. [PMID: 27575427 DOI: 10.1016/j.scitotenv.2016.07.182] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 07/02/2016] [Accepted: 07/25/2016] [Indexed: 06/06/2023]
Abstract
Methane is one of the critical greenhouse gases, which absorb long wavelength radiation, affects the chemistry of atmosphere and contributes to global climate change. Rice ecosystem is one of the major anthropogenic sources of methane. The anaerobic waterlogged soil in rice field provides an ideal environment to methanogens for methanogenesis. However, the rate of methanogenesis differs according to rice cultivation regions due to a number of biological, environmental and physical factors like carbon sources, pH, Eh, temperature etc. The interplay between the different conditions and factors may also convert the rice fields into sink from source temporarily. Mechanistic understanding and comprehensive evaluation of these variations and responsible factors are urgently required for designing new mitigation options and evaluation of reported option in different climatic conditions. The objective of this review paper is to develop conclusive understanding on the methane production, oxidation, and emission and methane measurement techniques from rice field along with its mitigation/abatement mechanism to explore the possible reduction techniques from rice ecosystem.
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Affiliation(s)
- Sandeep K Malyan
- Centre for Environment Science and Climate Resilient Agriculture, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Arti Bhatia
- Centre for Environment Science and Climate Resilient Agriculture, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India.
| | - Amit Kumar
- Centre for Environment Science and Climate Resilient Agriculture, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Dipak Kumar Gupta
- ICAR-Central Arid Zone Research Institute, Regional Research Station, Pali-Marwar, Rajasthan 342003, India
| | - Renu Singh
- Centre for Environment Science and Climate Resilient Agriculture, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Smita S Kumar
- Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar, Haryana 125001, India
| | - Ritu Tomer
- Centre for Environment Science and Climate Resilient Agriculture, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Om Kumar
- Centre for Environment Science and Climate Resilient Agriculture, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Niveta Jain
- Centre for Environment Science and Climate Resilient Agriculture, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
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Liu D, Tago K, Hayatsu M, Tokida T, Sakai H, Nakamura H, Usui Y, Hasegawa T, Asakawa S. Effect of Elevated CO2 Concentration, Elevated Temperature and No Nitrogen Fertilization on Methanogenic Archaeal and Methane-Oxidizing Bacterial Community Structures in Paddy Soil. Microbes Environ 2016; 31:349-56. [PMID: 27600710 PMCID: PMC5017813 DOI: 10.1264/jsme2.me16066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 07/12/2016] [Indexed: 11/12/2022] Open
Abstract
Elevated concentrations of atmospheric CO2 ([CO2]) enhance the production and emission of methane in paddy fields. In the present study, the effects of elevated [CO2], elevated temperature (ET), and no nitrogen fertilization (LN) on methanogenic archaeal and methane-oxidizing bacterial community structures in a free-air CO2 enrichment (FACE) experimental paddy field were investigated by PCR-DGGE and real-time quantitative PCR. Soil samples were collected from the upper and lower soil layers at the rice panicle initiation (PI) and mid-ripening (MR) stages. The composition of the methanogenic archaeal community in the upper and lower soil layers was not markedly affected by the elevated [CO2], ET, or LN condition. The abundance of the methanogenic archaeal community in the upper and lower soil layers was also not affected by elevated [CO2] or ET, but was significantly increased at the rice PI stage and significantly decreased by LN in the lower soil layer. In contrast, the composition of the methane-oxidizing bacterial community was affected by rice-growing stages in the upper soil layer. The abundance of methane-oxidizing bacteria was significantly decreased by elevated [CO2] and LN in both soil layers at the rice MR stage and by ET in the upper soil layer. The ratio of mcrA/pmoA genes correlated with methane emission from ambient and FACE paddy plots at the PI stage. These results indicate that the decrease observed in the abundance of methane-oxidizing bacteria was related to increased methane emission from the paddy field under the elevated [CO2], ET, and LN conditions.
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Affiliation(s)
- Dongyan Liu
- Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya UniversityChikusa, Nagoya, Aichi 464–8601Japan
| | - Kanako Tago
- National Institute for Agro-Environmental Sciences3–1–3 Kannondai, Tsukuba, Ibaraki 305–8604Japan
| | - Masahito Hayatsu
- National Institute for Agro-Environmental Sciences3–1–3 Kannondai, Tsukuba, Ibaraki 305–8604Japan
| | - Takeshi Tokida
- National Institute for Agro-Environmental Sciences3–1–3 Kannondai, Tsukuba, Ibaraki 305–8604Japan
| | - Hidemitsu Sakai
- National Institute for Agro-Environmental Sciences3–1–3 Kannondai, Tsukuba, Ibaraki 305–8604Japan
| | | | - Yasuhiro Usui
- National Institute for Agro-Environmental Sciences3–1–3 Kannondai, Tsukuba, Ibaraki 305–8604Japan
- Hokkaido Agricultural Research Center, NAROShinseiminami 9–4, Memuro, Kasai, Hokkaido 082–0081Japan
| | - Toshihiro Hasegawa
- National Institute for Agro-Environmental Sciences3–1–3 Kannondai, Tsukuba, Ibaraki 305–8604Japan
| | - Susumu Asakawa
- Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya UniversityChikusa, Nagoya, Aichi 464–8601Japan
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Karthikeyan OP, Chidambarampadmavathy K, Nadarajan S, Heimann K. Influence of nutrients on oxidation of low level methane by mixed methanotrophic consortia. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:4346-4357. [PMID: 26867685 DOI: 10.1007/s11356-016-6174-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Accepted: 01/25/2016] [Indexed: 06/05/2023]
Abstract
Low-level methane emissions from coal mine ventilation air (CMV-CH4; i.e., 1 % CH4) can significantly contribute to global climate change, and therefore, treatment is important to reduce impacts. To investigate CMV-CH4 abatement potential, five different mixed methanotrohic consortia (MMCs) were established from soil/sediment sources, i.e., landfill top cover soil, bio-solid compost, vegetated humus soil, estuarine and marine sediments. Enrichment conditions for MMCs were as follows: nitrate mineral salt (NMS) medium, pH ~ 6.8; 25 °C; 20-25 % CH4; agitation 200 rpm; and culture period 20 days, in mini-bench-top bioreactors. The enriched cultures were supplemented with extra carbon (methanol 0.5-1.5 %, formate 5-15 mM, and acetate 5-15 mM), nitrogen (nitrate 0.5-1.5 g L(-1), ammonium 0.1-0.5 g L(-1), or urea: 0.1-0.5 g L(-1)), and trace elements (copper 1-5 μM, iron 1-5 μM, and zinc 1-5 μM) in different batch experiments to improve low-level CH4 abatement. Average CH4 oxidation capacities (MOCs) of MMCs varied between 1.712 ± 0.032 and 1.963 ± 0.057 mg g(-1)DWbiomass h(-1). Addition of formate improved the MOCs of MMCs, but the dose-response varied for different MMCs. Acetate, nitrate and copper had no significant effect on MOCs, while addition of methanol, ammonium, urea, iron and zinc impacted negatively. Overall, MMCs enriched from marine sediments and landfill top cover soil showed high MOCs which were largely resilient to nutrient supplementation, suggesting a strong potential for biofilter development for industrial low-level CH4 abatement, such as those present in CMV.
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Affiliation(s)
- Obulisamy Parthiba Karthikeyan
- College of Marine and Environmental Sciences, James Cook University, Townsville, 4811, Queensland, Australia
- Comparative Genomics Centre, James Cook University, Townsville, 4811, Queensland, Australia
| | | | - Saravanan Nadarajan
- College of Marine and Environmental Sciences, James Cook University, Townsville, 4811, Queensland, Australia
| | - Kirsten Heimann
- College of Marine and Environmental Sciences, James Cook University, Townsville, 4811, Queensland, Australia.
- Comparative Genomics Centre, James Cook University, Townsville, 4811, Queensland, Australia.
- Centre for Bio-discovery and Molecular Development of Therapeutics, James Cook University, Townsville, 4811, Queensland, Australia.
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Karthikeyan OP, Chidambarampadmavathy K, Nadarajan S, Lee PKH, Heimann K. Effect of CH4/O2 ratio on fatty acid profile and polyhydroxybutyrate content in a heterotrophic-methanotrophic consortium. CHEMOSPHERE 2015; 141:235-42. [PMID: 26247542 DOI: 10.1016/j.chemosphere.2015.07.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 06/14/2015] [Accepted: 07/19/2015] [Indexed: 05/22/2023]
Abstract
Understanding the role of heterotrophic-methanotrophic (H-Meth) communities is important for improvement of methane (CH4) oxidation capacities (MOC) particularly in conjunction with bio-product development in industrial bio-filters. Initially, a H-Meth consortium was established and enriched from marine sediments and characterized by next generation sequencing of the 16s rDNA gene. The enriched consortium was subjected to 10-50% CH4 (i.e., 0.20-1.6 CH4/O2 ratios) to study the effects on MOCs, biomass growth, fatty acid profiles and biopolymer (e.g. polyhydroxybutyrate; PHB) content. Methylocystis, Methylophaga and Pseudoxanthomonas dominated the H-Meth consortium. Culture enrichment of the H-Meth consortium resulted in 15-20-folds higher MOC compared to seed sediments. Increasing CH4 concentration (and decreased O2 levels) yielded higher MOCs, but did not improve total fatty acid contents. PHB contents varied between 2.5% and 8.5% independently of CH4/O2 ratios. The results suggest that H-Meth consortia could potentially be used in industrial bio-filters for production of biopolymer/biofuel precursors from CH4.
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Affiliation(s)
- Obulisamy P Karthikeyan
- College of Marine and Environmental Sciences, James Cook University, Townsville 4811, Queensland, Australia; Centre for Sustainable Fisheries and Aquaculture, James Cook University, Townsville 4811, Queensland, Australia; Comparative Genomics Centre, James Cook University, Townsville 4811, Queensland, Australia
| | - Karthigeyan Chidambarampadmavathy
- College of Marine and Environmental Sciences, James Cook University, Townsville 4811, Queensland, Australia; Centre for Sustainable Fisheries and Aquaculture, James Cook University, Townsville 4811, Queensland, Australia
| | - Saravanan Nadarajan
- College of Marine and Environmental Sciences, James Cook University, Townsville 4811, Queensland, Australia; Centre for Sustainable Fisheries and Aquaculture, James Cook University, Townsville 4811, Queensland, Australia
| | - Patrick K H Lee
- School of Energy and Environment, City University of Hong Kong, Hong Kong
| | - Kirsten Heimann
- College of Marine and Environmental Sciences, James Cook University, Townsville 4811, Queensland, Australia; Centre for Sustainable Fisheries and Aquaculture, James Cook University, Townsville 4811, Queensland, Australia; Comparative Genomics Centre, James Cook University, Townsville 4811, Queensland, Australia; Centre for Bio-discovery and Molecular Development of Therapeutics, James Cook University, Townsville 4811, Queensland, Australia.
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27
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Shvaleva A, Siljanen HMP, Correia A, Costa e Silva F, Lamprecht RE, Lobo-do-Vale R, Bicho C, Fangueiro D, Anderson M, Pereira JS, Chaves MM, Cruz C, Martikainen PJ. Environmental and microbial factors influencing methane and nitrous oxide fluxes in Mediterranean cork oak woodlands: trees make a difference. Front Microbiol 2015; 6:1104. [PMID: 26528257 PMCID: PMC4604323 DOI: 10.3389/fmicb.2015.01104] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 09/24/2015] [Indexed: 01/11/2023] Open
Abstract
Cork oak woodlands (montado) are agroforestry systems distributed all over the Mediterranean basin with a very important social, economic and ecological value. A generalized cork oak decline has been occurring in the last decades jeopardizing its future sustainability. It is unknown how loss of tree cover affects microbial processes that are consuming greenhouse gases in the montado ecosystem. The study was conducted under two different conditions in the natural understory of a cork oak woodland in center Portugal: under tree canopy (UC) and open areas without trees (OA). Fluxes of methane and nitrous oxide were measured with a static chamber technique. In order to quantify methanotrophs and bacteria capable of nitrous oxide consumption, we used quantitative real-time PCR targeting the pmoA and nosZ genes encoding the subunit of particulate methane mono-oxygenase and catalytic subunit of the nitrous oxide reductase, respectively. A significant seasonal effect was found on CH4 and N2O fluxes and pmoA and nosZ gene abundance. Tree cover had no effect on methane fluxes; conversely, whereas the UC plots were net emitters of nitrous oxide, the loss of tree cover resulted in a shift in the emission pattern such that the OA plots were a net sink for nitrous oxide. In a seasonal time scale, the UC had higher gene abundance of Type I methanotrophs. Methane flux correlated negatively with abundance of Type I methanotrophs in the UC plots. Nitrous oxide flux correlated negatively with nosZ gene abundance at the OA plots in contrast to that at the UC plots. In the UC soil, soil organic matter had a positive effect on soil extracellular enzyme activities, which correlated positively with the N2O flux. Our results demonstrated that tree cover affects soil properties, key enzyme activities and abundance of microorganisms and, consequently net CH4 and N2O exchange.
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Affiliation(s)
- Alla Shvaleva
- Instituto de Tecnologia Química e Biológica, Universidade Nova de LisboaOeiras, Portugal
| | - Henri M. P. Siljanen
- Department of Environmental Science, University of Eastern FinlandKuopio, Finland
| | - Alexandra Correia
- Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de LisboaLisboa, Portugal
| | - Filipe Costa e Silva
- Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de LisboaLisboa, Portugal
| | - Richard E. Lamprecht
- Department of Environmental Science, University of Eastern FinlandKuopio, Finland
| | - Raquel Lobo-do-Vale
- Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de LisboaLisboa, Portugal
| | - Catarina Bicho
- Instituto de Tecnologia Química e Biológica, Universidade Nova de LisboaOeiras, Portugal
| | - David Fangueiro
- Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de LisboaLisboa, Portugal
| | | | - João S. Pereira
- Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de LisboaLisboa, Portugal
| | - Maria M. Chaves
- Instituto de Tecnologia Química e Biológica, Universidade Nova de LisboaOeiras, Portugal
| | - Cristina Cruz
- Centre for Ecology Evolution and Environmental Changes, Faculdade de Ciências, Universidade de LisboaLisboa, Portugal
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Substrate sources regulate spatial variation of metabolically active methanogens from two contrasting freshwater wetlands. Appl Microbiol Biotechnol 2015; 99:10779-91. [DOI: 10.1007/s00253-015-6912-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 07/28/2015] [Accepted: 08/03/2015] [Indexed: 11/24/2022]
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29
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Chidambarampadmavathy K, Karthikeyan OP, Heimann K. Biopolymers made from methane in bioreactors. Eng Life Sci 2015. [DOI: 10.1002/elsc.201400203] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Affiliation(s)
- Karthigeyan Chidambarampadmavathy
- College of Marine and Environmental Science; James Cook University; Townsville Queensland Australia
- Centre for Sustainable Fisheries and Aquaculture; James Cook University; Townsville Queensland Australia
| | - Obulisamy P. Karthikeyan
- College of Marine and Environmental Science; James Cook University; Townsville Queensland Australia
- Centre for Sustainable Fisheries and Aquaculture; James Cook University; Townsville Queensland Australia
| | - Kirsten Heimann
- College of Marine and Environmental Science; James Cook University; Townsville Queensland Australia
- Centre for Sustainable Fisheries and Aquaculture; James Cook University; Townsville Queensland Australia
- Centre for Biodiscovery and Molecular Development of Therapeutics; James Cook University; Townsville Queensland Australia
- Comparative Genomics Centre; James Cook University; Townsville Queensland Australia
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Crevecoeur S, Vincent WF, Comte J, Lovejoy C. Bacterial community structure across environmental gradients in permafrost thaw ponds: methanotroph-rich ecosystems. Front Microbiol 2015; 6:192. [PMID: 25926816 PMCID: PMC4396522 DOI: 10.3389/fmicb.2015.00192] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 02/20/2015] [Indexed: 11/15/2022] Open
Abstract
Permafrost thawing leads to the formation of thermokarst ponds that potentially emit CO2 and CH4 to the atmosphere. In the Nunavik subarctic region (northern Québec, Canada), these numerous, shallow ponds become well-stratified during summer. This creates a physico-chemical gradient of temperature and oxygen, with an upper oxic layer and a bottom low oxygen or anoxic layer. Our objective was to determine the influence of stratification and related limnological and landscape properties on the community structure of potentially active bacteria in these waters. Samples for RNA analysis were taken from ponds in three contrasting valleys across a gradient of permafrost degradation. A total of 1296 operational taxonomic units were identified by high throughput amplicon sequencing, targeting bacterial 16S rRNA that was reverse transcribed to cDNA. β-proteobacteria were the dominant group in all ponds, with highest representation by the genera Variovorax and Polynucleobacter. Methanotrophs were also among the most abundant sequences at most sites. They accounted for up to 27% of the total sequences (median of 4.9% for all samples), indicating the importance of methane as a bacterial energy source in these waters. Both oxygenic (cyanobacteria) and anoxygenic (Chlorobi) phototrophs were also well-represented, the latter in the low oxygen bottom waters. Ordination analyses showed that the communities clustered according to valley and depth, with significant effects attributed to dissolved oxygen, pH, dissolved organic carbon, and total suspended solids. These results indicate that the bacterial assemblages of permafrost thaw ponds are filtered by environmental gradients, and are complex consortia of functionally diverse taxa that likely affect the composition as well as magnitude of greenhouse gas emissions from these abundant waters.
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Affiliation(s)
- Sophie Crevecoeur
- Département de Biologie and Takuvik Joint International Laboratory, Université Laval Québec, QC, Canada ; Centre d'Études Nordiques, Université Laval Québec, QC, Canada ; Institut de Biologie Intégrative et des Systèmes, Université Laval Québec, QC, Canada
| | - Warwick F Vincent
- Département de Biologie and Takuvik Joint International Laboratory, Université Laval Québec, QC, Canada ; Centre d'Études Nordiques, Université Laval Québec, QC, Canada
| | - Jérôme Comte
- Département de Biologie and Takuvik Joint International Laboratory, Université Laval Québec, QC, Canada ; Centre d'Études Nordiques, Université Laval Québec, QC, Canada ; Institut de Biologie Intégrative et des Systèmes, Université Laval Québec, QC, Canada
| | - Connie Lovejoy
- Département de Biologie and Takuvik Joint International Laboratory, Université Laval Québec, QC, Canada ; Institut de Biologie Intégrative et des Systèmes, Université Laval Québec, QC, Canada ; Québec Océan, Université Laval Québec, QC, Canada
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31
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Dieser M, Broemsen ELJE, Cameron KA, King GM, Achberger A, Choquette K, Hagedorn B, Sletten R, Junge K, Christner BC. Molecular and biogeochemical evidence for methane cycling beneath the western margin of the Greenland Ice Sheet. THE ISME JOURNAL 2014; 8:2305-16. [PMID: 24739624 PMCID: PMC4992074 DOI: 10.1038/ismej.2014.59] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 03/08/2014] [Accepted: 03/14/2014] [Indexed: 11/08/2022]
Abstract
Microbial processes that mineralize organic carbon and enhance solute production at the bed of polar ice sheets could be of a magnitude sufficient to affect global elemental cycles. To investigate the biogeochemistry of a polar subglacial microbial ecosystem, we analyzed water discharged during the summer of 2012 and 2013 from Russell Glacier, a land-terminating outlet glacier at the western margin of the Greenland Ice Sheet. The molecular data implied that the most abundant and active component of the subglacial microbial community at these marginal locations were bacteria within the order Methylococcales (59-100% of reverse transcribed (RT)-rRNA sequences). mRNA transcripts of the particulate methane monooxygenase (pmoA) from these taxa were also detected, confirming that methanotrophic bacteria were functional members of this subglacial ecosystem. Dissolved methane ranged between 2.7 and 83 μM in the subglacial waters analyzed, and the concentration was inversely correlated with dissolved oxygen while positively correlated with electrical conductivity. Subglacial microbial methane production was supported by δ(13)C-CH4 values between -64‰ and -62‰ together with the recovery of RT-rRNA sequences that classified within the Methanosarcinales and Methanomicrobiales. Under aerobic conditions, >98% of the methane in the subglacial water was consumed over ∼30 days incubation at ∼4 °C and rates of methane oxidation were estimated at 0.32 μM per day. Our results support the occurrence of active methane cycling beneath this region of the Greenland Ice Sheet, where microbial communities poised in oxygenated subglacial drainage channels could serve as significant methane sinks.
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Affiliation(s)
- Markus Dieser
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Erik L J E Broemsen
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Karen A Cameron
- Applied Physics Laboratory, Polar Science Center, University of Washington, Seattle, WA, USA
| | - Gary M King
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Amanda Achberger
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Kyla Choquette
- Applied Science Engineering and Technology Laboratory, Environment and Natural Resources Institute, University of Alaska Anchorage, Anchorage, AK, USA
| | - Birgit Hagedorn
- Applied Science Engineering and Technology Laboratory, Environment and Natural Resources Institute, University of Alaska Anchorage, Anchorage, AK, USA
| | - Ron Sletten
- Department of Earth and Space Sciences, University of Washington, Seattle, WA, USA
| | - Karen Junge
- Applied Physics Laboratory, Polar Science Center, University of Washington, Seattle, WA, USA
| | - Brent C Christner
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
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Chen R, Wang Y, Wei S, Wang W, Lin X. Windrow composting mitigated CH4emissions: characterization of methanogenic and methanotrophic communities in manure management. FEMS Microbiol Ecol 2014; 90:575-86. [DOI: 10.1111/1574-6941.12417] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 08/11/2014] [Accepted: 08/13/2014] [Indexed: 11/30/2022] Open
Affiliation(s)
- Ruirui Chen
- State Key Laboratory of Soil and Sustainable Agriculture; Institute of Soil Science; Chinese Academy of Sciences; Nanjing China
| | - Yiming Wang
- State Key Laboratory of Soil and Sustainable Agriculture; Institute of Soil Science; Chinese Academy of Sciences; Nanjing China
| | - Shiping Wei
- State Key Laboratory of Soil and Sustainable Agriculture; Institute of Soil Science; Chinese Academy of Sciences; Nanjing China
| | - Wei Wang
- State Key Laboratory of Soil and Sustainable Agriculture; Institute of Soil Science; Chinese Academy of Sciences; Nanjing China
| | - Xiangui Lin
- State Key Laboratory of Soil and Sustainable Agriculture; Institute of Soil Science; Chinese Academy of Sciences; Nanjing China
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33
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Yun J, Ju Y, Deng Y, Zhang H. Bacterial community structure in two permafrost wetlands on the Tibetan Plateau and Sanjiang Plain, China. MICROBIAL ECOLOGY 2014; 68:360-369. [PMID: 24718907 DOI: 10.1007/s00248-014-0415-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 03/31/2014] [Indexed: 06/03/2023]
Abstract
Permafrost wetlands are important methane emission sources and fragile ecosystems sensitive to climate change. Presently, there remains a lack of knowledge regarding bacterial communities, especially methanotrophs in vast areas of permafrost on the Tibetan Plateau in Northwest China and the Sanjiang Plain (SJ) in Northeast China. In this study, 16S rRNA-based quantitative PCR (qPCR) and 454 pyrosequencing were used to identify bacterial communities in soils sampled from a littoral wetland of Lake Namco on the Tibetan Plateau (NMC) and an alluvial wetland on the SJ. Additionally, methanotroph-specific primers targeting particulate methane monooxygenase subunit A gene (pmoA) were used for qPCR and pyrosequencing analysis of methanotrophic community structure in NMC soils. qPCR analysis revealed the presence of 10(10) 16S rRNA gene copies per gram of wet soil in both wetlands, with 10(8) pmoA copies per gram of wet soil in NMC. The two permafrost wetlands showed similar bacterial community compositions, which differed from those reported in other cold environments. Proteobacteria, Actinobacteria , and Chloroflexi were the most abundant phyla in both wetlands, whereas Acidobacteria was prevalent in the acidic wetland SJ only. These four phyla constituted more than 80 % of total bacterial community diversity in permafrost wetland soils, and Methylobacter of type I methanotrophs was overwhelmingly dominant in NMC soils. This study is the first major bacterial sequencing effort of permafrost in the NMC and SJ wetlands, which provides fundamental data for further studies of microbial function in extreme ecosystems under climate change scenarios.
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Affiliation(s)
- Juanli Yun
- College of Resources and Environment, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
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34
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Tobermolite effects on methane removal activity and microbial community of a lab-scale soil biocover. ACTA ACUST UNITED AC 2014; 41:1119-29. [DOI: 10.1007/s10295-014-1448-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 04/17/2014] [Indexed: 10/25/2022]
Abstract
Abstract
Three identical lab-scale biocovers were packed with an engineered soil (BC 1), tobermolite only (BC 2), and a mixture of the soil and tobermolite (BC 3), and were operated at an inlet load of 338–400 g-CH4 m−2 d−1 and a space velocity of 0.12 h−1. The methane removal capacity was 293 ± 47 g-CH4 m−2 d−1 in steady state in the BC 3, which was significantly higher than those in the BC 1 and BC 2 (106 ± 24 and 114 ± 48 g-CH4 m−2 d−1, respectively). Quantitative PCR indicated that bacterial and methanotrophic densities (6.62–6.78 × 107 16S rDNA gene copy number g-dry sample−1 and 1.37–2.23 × 107 pmoA gene copy number g-dry sample−1 in the BC 1 and BC 3, respectively) were significantly higher than those in the BC 2. Ribosomal tag pyrosequencing showed that methanotrophs comprised approximately 60 % of the bacterial community in the BC 2 and BC 3, while they only comprised 43 % in the BC 1. The engineered soil favored the growth of total bacteria including methanotrophs, while the presence of tobermolite enhanced the relative abundance of methanotrophs, resulting in an improved habitat for methanotrophs as well as greater methane mitigation performance in the mixture. Moreover, a batch experiment indicated that the soil and tobermolite mixture could display a stable methane oxidation level over wide temperature (20–40 °C, at least 38 μmol g-dry sample−1 h−1) and pH (5–8, at least 61 μmol g-dry sample−1 h−1) ranges. In conclusion, the soil and tobermolite mixture is promising for methane mitigation.
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Mohanty SR, Rajput P, Kollah B, Chourasiya D, Tiwari A, Singh M, Rao AS. Methane oxidation and abundance of methane oxidizers in tropical agricultural soil (vertisol) in response to CuO and ZnO nanoparticles contamination. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:3743-3753. [PMID: 24504670 DOI: 10.1007/s10661-014-3654-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Accepted: 01/21/2014] [Indexed: 06/03/2023]
Abstract
There is worldwide concern over the increase use of nanoparticles (NPs) and their ecotoxicological effect. It is not known if the annual production of tons of industrial nanoparticles (NPs) has the potential to impact terrestrial microbial communities, which are so necessary for ecosystem functioning. Here, we have examined the consequences of adding the NPs particularly the metal oxide (CuO, ZnO) on CH4 oxidation activity in vertisol and the abundance of heterotrophs, methane oxidizers, and ammonium oxidizers. Soil samples collected from the agricultural field located at Madhya Pradesh, India, were incubated with either CuO and ZnO NPs or ionic heavy metals (CuCl2, ZnCl2) separately at 0, 10, and 20 μg g(-1) soil. CH4 oxidation activity in the soil samples was estimated at 60 and 100 % moisture holding capacity (MHC) in order to link soil moisture regime with impact of NPs. NPs amended to soil were highly toxic for the microbial-mediated CH4 oxidation, compared with the ionic form. The trend of inhibition was Zn 20 > Zn 10 > Cu 20 > Cu 10. NPs delayed the lag phase of CH4 oxidation to a maximum of 4-fold and also decreased the apparent rate constant k up to 50 % over control. ANOVA and Pearson correlation analysis (α = 0.01) revealed significant impact of NPs on the CH4 oxidation activity and microbial abundance (p < 0.0001, and high F statistics). Principal component analysis (PCA) revealed that PC1 (metal concentration) rendered 76.06 % of the total variance, while 18.17 % of variance accounted by second component (MHC). Biplot indicated negative impact of NPs on CH4 oxidation and microbial abundance. Our result also confirmed that higher soil moisture regime alleviates toxicity of NPs and opens new avenues of research to manage ecotoxicity and environmental hazard of NPs.
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Lee HJ, Kim SY, Kim PJ, Madsen EL, Jeon CO. Methane emission and dynamics of methanotrophic and methanogenic communities in a flooded rice field ecosystem. FEMS Microbiol Ecol 2014; 88:195-212. [DOI: 10.1111/1574-6941.12282] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 01/03/2014] [Accepted: 01/03/2014] [Indexed: 01/19/2023] Open
Affiliation(s)
- Hyo Jung Lee
- Department of Life Science; Chung-Ang University; Seoul Korea
| | - Sang Yoon Kim
- Division of Applied Life Science; Gyeongsang National University; Jinju Korea
| | - Pil Joo Kim
- Division of Applied Life Science; Gyeongsang National University; Jinju Korea
| | | | - Che Ok Jeon
- Department of Life Science; Chung-Ang University; Seoul Korea
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Li H, Chi Z, Lu W, Wang H. Sensitivity of methanotrophic community structure, abundance, and gene expression to CH4 and O2 in simulated landfill biocover soil. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2014; 184:347-353. [PMID: 24095811 DOI: 10.1016/j.envpol.2013.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 08/27/2013] [Accepted: 09/01/2013] [Indexed: 06/02/2023]
Abstract
Pressure on mitigating CH4 emission in landfill requires better understanding of methanotrophs in landfill biocovers. Most previous studies focused on CH4 as the sole substrate. This study aims to understand the sensitivity of methanotrophs to both substrates CH4 and O2 concentrations in landfill biocovers. The estimated CH4 oxidation rates (4.66-98.7 × 10(-16) mol cell(-1) h(-1)) were evidently higher than the previous reports, suggesting that activity of methanotrophs was enhanced with both the increasing of O2 and CH4 concentrations. Denaturing gradient gel electrophoresis based on the amplification of pmoA genes suggested that methanotrophs were more sensitive to CH4 than O2. Quantification of methanotrophs using pmoA- and mmoX-targeted real-time polymerase chain reaction showed that Mbac and Mcoc as well as Mcys groups were significantly dominant. Mbac group with pmoA gene transcription was dominant. Results indicate that CH4 mitigation would have higher potential by increasing O2 at appropriate CH4 concentrations.
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Affiliation(s)
- Huai Li
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China; School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
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Ho A, Kerckhof FM, Luke C, Reim A, Krause S, Boon N, Bodelier PLE. Conceptualizing functional traits and ecological characteristics of methane-oxidizing bacteria as life strategies. ENVIRONMENTAL MICROBIOLOGY REPORTS 2013; 5:335-45. [PMID: 23754714 DOI: 10.1111/j.1758-2229.2012.00370.x] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 07/06/2012] [Accepted: 07/15/2012] [Indexed: 05/11/2023]
Abstract
Methane-oxidizing bacteria (MOB) possess the ability to use methane for energy generation and growth, thereby, providing a key ecosystem service that is highly relevant to the regulation of the global climate. MOB subgroups have different responses to key environmental controls, reflecting on their functional traits. Their unique features (C1-metabolism, unique lipids and congruence between the 16S rRNA and pmoA gene phylogeny) have facilitated numerous environmental studies, which in combination with the availability of cultured representatives, yield the most comprehensive ecological picture of any known microbial functional guild. Here, we focus on the broad MOB subgroups (type I and type II MOB), and aim to conceptualize MOB functional traits and observational characteristics derived primarily from these environmental studies to be interpreted as microbial life strategies. We focus on the functional traits, and the conditions under which these traits will render different MOB subgroups a selective advantage. We hypothesize that type I and type II MOB generally have distinct life strategies, enabling them to predominate under different conditions and maintain functionality. The ecological characteristics implicated in their adopted life strategies are discussed, and incorporated into the Competitor-Stress tolerator-Ruderal functional classification framework as put forward for plant communities. In this context, type I MOB can broadly be classified as competitor-ruderal while type II MOB fit more within the stress tolerator categories. Finally, we provide an outlook on MOB applications by exemplifying two approaches where their inferred life strategies could be exploited thereby, putting MOB into the context of microbial resource management.
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Affiliation(s)
- Adrian Ho
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Coupure Links 653, B-9000 Ghent, Belgium
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Nazaries L, Murrell JC, Millard P, Baggs L, Singh BK. Methane, microbes and models: fundamental understanding of the soil methane cycle for future predictions. Environ Microbiol 2013; 15:2395-417. [DOI: 10.1111/1462-2920.12149] [Citation(s) in RCA: 216] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 04/19/2013] [Accepted: 04/22/2013] [Indexed: 01/06/2023]
Affiliation(s)
- Loïc Nazaries
- Hawkesbury Institute for the Environment; University of Western Sydney; Building L9; Locked Bag 1797; Penrith South; NSW; 2751; Australia
| | - J. Colin Murrell
- School of Environmental Sciences; University of East Anglia; Norwich Research Park; Norwich; NR4 7TJ; UK
| | - Pete Millard
- Landcare Research; PO Box 40; Lincoln; 7604; New Zealand
| | - Liz Baggs
- Institute of Biological and Environmental Sciences; University of Aberdeen; Zoology Building; Tillydrone Avenue; Aberdeen; AB24 2TZ; Scotland; UK
| | - Brajesh K. Singh
- Hawkesbury Institute for the Environment; University of Western Sydney; Building L9; Locked Bag 1797; Penrith South; NSW; 2751; Australia
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40
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Mohanty SR, Kollah B, Sharma VK, Singh AB, Singh M, Rao AS. Methane oxidation and methane driven redox process during sequential reduction of a flooded soil ecosystem. ANN MICROBIOL 2013. [DOI: 10.1007/s13213-013-0633-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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41
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Chi ZF, Lu WJ, Li H, Wang HT. Dynamics of CH4 oxidation in landfill biocover soil: effect of O2/CH4 ratio on CH4 metabolism. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2012; 170:8-14. [PMID: 22763325 DOI: 10.1016/j.envpol.2012.06.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Revised: 05/17/2012] [Accepted: 06/02/2012] [Indexed: 06/01/2023]
Abstract
The CH(4) oxidation dynamics was investigated by observing the CH(4) oxidation rates at concentrations (from 1.0 × 10(4) ppmv to 2.0 × 10(5) ppmv) mixed with O(2) (from 5.0 × 10(4) ppmv to 7.5 × 10(5) ppmv). The CH(4)-O(2) dual-substrate model based on Michaelis-Menten equation (K(m, CH4) = 1.4 × 10(5) ppmv; V(max) = 7.6 × 10(2) μmol kg(-1) d(-1); K(m, O2) = 5.5 × 10(4) ppmv) was got and agreed well with the experimental data when the initial O(2)/CH(4) ratio reached 3:1, indicating full aerobic CH(4) oxidization. Anoxic CH(4) oxidation gradually became predominant with decreasing O(2)/CH(4) ratios. The effect of CH(4) is more significant than O(2), as evidenced by higher slope (0.58 kg(-1) d(-1)) of V(CH4) - [S(CH4)] line graph compared with that of V(CH4) - [S(CH4)] line graph (0.062 kg(-1) d(-1)). The paper presents the dynamics of CH(4) oxidation and proposes that ratio of O(2)/CH(4) need to be considered for their dynamically changing in environmental habitats. The findings provide an important parameter for optimizing the operations of breathing biocover systems.
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Affiliation(s)
- Zi-Fang Chi
- College of Environment and Resources, Jilin University, Changchun 130021, China
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42
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Singh JS, Singh DP. Reforestation: A potential approach to mitigate excess atmospheric CH4build-up. ECOLOGICAL MANAGEMENT & RESTORATION 2012. [DOI: 10.1111/emr.12004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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43
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One millimetre makes the difference: high-resolution analysis of methane-oxidizing bacteria and their specific activity at the oxic-anoxic interface in a flooded paddy soil. ISME JOURNAL 2012; 6:2128-39. [PMID: 22695859 DOI: 10.1038/ismej.2012.57] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Aerobic methane-oxidizing bacteria (MOB) use a restricted substrate range, yet >30 species-equivalent operational taxonomical units (OTUs) are found in one paddy soil. How these OTUs physically share their microhabitat is unknown. Here we highly resolved the vertical distribution of MOB and their activity. Using microcosms and cryosectioning, we sub-sampled the top 3-mm of a water-saturated soil at near in situ conditions in 100-μm steps. We assessed the community structure and activity using the particulate methane monooxygenase gene pmoA as a functional and phylogenetic marker by terminal restriction fragment length polymorphism (t-RFLP), a pmoA-specific diagnostic microarray, and cloning and sequencing. pmoA genes and transcripts were quantified using competitive reverse transcriptase PCR combined with t-RFLP. Only a subset of the methanotroph community was active. Oxygen microprofiles showed that 89% of total respiration was confined to a 0.67-mm-thick zone immediately above the oxic-anoxic interface, most probably driven by methane oxidation. In this zone, a Methylobacter-affiliated OTU was highly active with up to 18 pmoA transcripts per cell and seemed to be adapted to oxygen and methane concentrations in the micromolar range. Analysis of transcripts with a pmoA-specific microarray found a Methylosarcina-affiliated OTU associated with the surface zone. High oxygen but only nanomolar methane concentrations at the surface suggested an adaptation of this OTU to oligotrophic conditions. No transcripts of type II methanotrophs (Methylosinus, Methylocystis) were found, which indicated that this group was represented by resting stages only. Hence, different OTUs within a single guild shared the same microenvironment and exploited different niches.
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Ma J, Rixey WG, DeVaull GE, Stafford BP, Alvarez PJJ. Methane bioattenuation and implications for explosion risk reduction along the groundwater to soil surface pathway above a plume of dissolved ethanol. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:6013-6019. [PMID: 22568485 DOI: 10.1021/es300715f] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Fuel ethanol releases can stimulate methanogenesis in impacted aquifers, which could pose an explosion risk if methane migrates into enclosed spaces where ignitable conditions exist. To assess this potential risk, a flux chamber was emplaced on a pilot-scale aquifer exposed to continuous release (21 months) of an ethanol solution (10% v:v) that was introduced 22.5 cm below the water table. Despite methane concentrations within the ethanol plume reaching saturated levels (20-23 mg/L), the maximum methane concentration reaching the chamber (21 ppm(v)) was far below the lower explosion limit in air (50,000 ppm(v)). The low concentrations of methane observed in the chamber are attributed to methanotrophic activity, which was highest in the capillary fringe. This was indicated by methane degradation assays in microcosms prepared with soil samples from different depths, as well as by PCR measurements of pmoA, which is a widely used functional gene biomarker for methanotrophs. Simulations with the analytical vapor intrusion model "Biovapor" corroborated the low explosion risk associated with ethanol fuel releases under more generic conditions. Model simulations also indicated that depending on site-specific conditions, methane oxidation in the unsaturated zone could deplete the available oxygen and hinder aerobic benzene biodegradation, thus increasing benzene vapor intrusion potential. Overall, this study shows the importance of methanotrophic activity near the water table to attenuate methane generated from dissolved ethanol plumes and reduce its potential to migrate and accumulate at the surface.
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Affiliation(s)
- Jie Ma
- Department of Civil and Environmental Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
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45
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Shifts in identity and activity of methanotrophs in arctic lake sediments in response to temperature changes. Appl Environ Microbiol 2012; 78:4715-23. [PMID: 22522690 DOI: 10.1128/aem.00853-12] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Methane (CH(4)) flux to the atmosphere is mitigated via microbial CH(4) oxidation in sediments and water. As arctic temperatures increase, understanding the effects of temperature on the activity and identity of methanotrophs in arctic lake sediments is important to predicting future CH(4) emissions. We used DNA-based stable-isotope probing (SIP), quantitative PCR (Q-PCR), and pyrosequencing analyses to identify and characterize methanotrophic communities active at a range of temperatures (4°C, 10°C, and 21°C) in sediments (to a depth of 25 cm) sampled from Lake Qalluuraq on the North Slope of Alaska. CH(4) oxidation activity was measured in microcosm incubations containing sediments at all temperatures, with the highest CH(4) oxidation potential of 37.5 μmol g(-1) day(-1) in the uppermost (depth, 0 to 1 cm) sediment at 21°C after 2 to 5 days of incubation. Q-PCR of pmoA and of the 16S rRNA genes of type I and type II methanotrophs, and pyrosequencing of 16S rRNA genes in (13)C-labeled DNA obtained by SIP demonstrated that the type I methanotrophs Methylobacter, Methylomonas, and Methylosoma dominated carbon acquisition from CH(4) in the sediments. The identity and relative abundance of active methanotrophs differed with the incubation temperature. Methylotrophs were also abundant in the microbial community that derived carbon from CH(4), especially in the deeper sediments (depth, 15 to 20 cm) at low temperatures (4°C and 10°C), and showed a good linear relationship (R = 0.82) with the relative abundances of methanotrophs in pyrosequencing reads. This study describes for the first time how methanotrophic communities in arctic lake sediments respond to temperature variations.
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46
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Freeze-coring method for characterization of microbial community structure and function in wetland soils at high spatial resolution. Appl Environ Microbiol 2012; 78:4501-4. [PMID: 22492456 DOI: 10.1128/aem.00133-12] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A simple freeze-coring method was developed to obtain structurally intact cores from wetland soils. A copper tube was inserted into the wetland and filled with ethanol and dry ice to freeze the surrounding soil. Biological structure and function could be analyzed, and labile compounds such as mRNA were recovered.
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47
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Siljanen HM, Saari A, Bodrossy L, Martikainen PJ. Seasonal variation in the function and diversity of methanotrophs in the littoral wetland of a boreal eutrophic lake. FEMS Microbiol Ecol 2012; 80:548-55. [DOI: 10.1111/j.1574-6941.2012.01321.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Revised: 01/18/2012] [Accepted: 01/23/2012] [Indexed: 01/02/2023] Open
Affiliation(s)
| | - Anne Saari
- Department of Environmental Science; University of Eastern Finland; Kuopio; Finland
| | - Levente Bodrossy
- Department of Bioresources/Microbiology; Austrian Institute of Technology; Seibersdorf; Austria
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Zheng Y, Yang W, Sun X, Wang SP, Rui YC, Luo CY, Guo LD. Methanotrophic community structure and activity under warming and grazing of alpine meadow on the Tibetan Plateau. Appl Microbiol Biotechnol 2011; 93:2193-203. [PMID: 21847510 DOI: 10.1007/s00253-011-3535-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 07/27/2011] [Accepted: 08/05/2011] [Indexed: 11/26/2022]
Abstract
Knowledge about methanotrophs and their activities is important to understand the microbial mediation of the greenhouse gas CH(4) under climate change and human activities in terrestrial ecosystems. The effects of simulated warming and sheep grazing on methanotrophic abundance, community composition, and activity were studied in an alpine meadow soil on the Tibetan Plateau. There was high abundance of methanotrophs (1.2-3.4 × 10(8) pmoA gene copies per gram of dry weight soil) assessed by real-time PCR, and warming significantly increased the abundance regardless of grazing. A total of 64 methanotrophic operational taxonomic units (OTUs) were obtained from 1,439 clone sequences, of these OTUs; 63 OTUs (98.4%) belonged to type I methanotrophs, and only one OTU was Methylocystis of type II methanotrophs. The methanotroph community composition and diversity were not apparently affected by the treatments. Warming and grazing significantly enhanced the potential CH(4) oxidation activity. There were significantly negative correlations between methanotrophic abundance and soil moisture and between methanotrophic abundance and NH(4)-N content. The study suggests that type I methanotrophs, as the dominance, may play a key role in CH(4) oxidation, and the alpine meadow has great potential to consume more CH(4) under future warmer and grazing conditions on the Tibetan Plateau.
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Affiliation(s)
- Yong Zheng
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
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49
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Bergmann GT, Bates ST, Eilers KG, Lauber CL, Caporaso JG, Walters WA, Knight R, Fierer N. The under-recognized dominance of Verrucomicrobia in soil bacterial communities. SOIL BIOLOGY & BIOCHEMISTRY 2011; 43:1450-1455. [PMID: 22267877 PMCID: PMC3260529 DOI: 10.1016/j.soilbio.2011.03.012] [Citation(s) in RCA: 361] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Verrucomicrobia are ubiquitous in soil, but members of this bacterial phylum are thought to be present at low frequency in soil, with few studies focusing specifically on verrucomicrobial abundance, diversity, and distribution. Here we used barcoded pyrosequencing to analyze verrucomicrobial communities in surface soils collected across a range of biomes in Antarctica, Europe, and the Americas (112 samples), as well as soils collected from pits dug in a montane coniferous forest (69 samples). Data collected from surface horizons indicate that Verrucomicrobia average 23% of bacterial sequences, making them far more abundant than had been estimated. We show that this underestimation is likely due to primer bias, as many of the commonly used PCR primers appear to exclude verrucomicrobial 16S rRNA genes during amplification. Verrucomicrobia were detected in 180 out of 181 soils examined, with members of the class Spartobacteria dominating verrucomicrobial communities in nearly all biomes and soil depths. The relative abundance of Verrucomicrobia was highest in grasslands and in subsurface soil horizons, where they were often the dominant bacterial phylum. Although their ecology remains poorly understood, Verrucomicrobia appear to be dominant in many soil bacterial communities across the globe, making additional research on their ecology clearly necessary.
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Affiliation(s)
- Gaddy T. Bergmann
- Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Campus Box 216, Boulder, Colorado 80309-0216, USA
- Department of Ecology and Evolutionary Biology, University of Colorado at Boulder, Campus Box 334, Boulder, Colorado 80309-0334, USA
| | - Scott T. Bates
- Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Campus Box 216, Boulder, Colorado 80309-0216, USA
- Department of Ecology and Evolutionary Biology, University of Colorado at Boulder, Campus Box 334, Boulder, Colorado 80309-0334, USA
| | - Kathryn G. Eilers
- Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Campus Box 216, Boulder, Colorado 80309-0216, USA
- Department of Ecology and Evolutionary Biology, University of Colorado at Boulder, Campus Box 334, Boulder, Colorado 80309-0334, USA
| | - Christian L. Lauber
- Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Campus Box 216, Boulder, Colorado 80309-0216, USA
- Department of Ecology and Evolutionary Biology, University of Colorado at Boulder, Campus Box 334, Boulder, Colorado 80309-0334, USA
| | - J. Gregory Caporaso
- Department of Chemistry and Biochemistry, University of Colorado at Boulder, Campus Box 215, Boulder, Colorado 80309-0215, USA
| | - William A. Walters
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Campus Box 347, Boulder, Colorado 80309-0347, USA
| | - Rob Knight
- Department of Chemistry and Biochemistry, University of Colorado at Boulder, Campus Box 215, Boulder, Colorado 80309-0215, USA
- Howard Hughes Medical Institute, 4000 Jones Bridge Road, Chevy Chase, MD 20815-6789
| | - Noah Fierer
- Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Campus Box 216, Boulder, Colorado 80309-0216, USA
- Department of Ecology and Evolutionary Biology, University of Colorado at Boulder, Campus Box 334, Boulder, Colorado 80309-0334, USA
- Corresponding author: Dr. Noah Fierer Assistant professor University of Colorado at Boulder Department of Ecology and Evolutionary Biology CIRES Box 216 UCB Boulder, CO 80309-0216, USA Office: 303-492-5615 Lab: 303-492-2099 Fax: 303-492-1149
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50
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Spokas KA, Bogner JE. Limits and dynamics of methane oxidation in landfill cover soils. WASTE MANAGEMENT (NEW YORK, N.Y.) 2011; 31:823-832. [PMID: 20096554 DOI: 10.1016/j.wasman.2009.12.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2009] [Revised: 12/02/2009] [Accepted: 12/22/2009] [Indexed: 05/28/2023]
Abstract
In order to understand the limits and dynamics of methane (CH(4)) oxidation in landfill cover soils, we investigated CH(4) oxidation in daily, intermediate, and final cover soils from two California landfills as a function of temperature, soil moisture and CO(2) concentration. The results indicate a significant difference between the observed soil CH(4) oxidation at field sampled conditions compared to optimum conditions achieved through pre-incubation (60 days) in the presence of CH(4) (50 ml l(-1)) and soil moisture optimization. This pre-incubation period normalized CH(4) oxidation rates to within the same order of magnitude (112-644 μg CH(4) g(-1) day(-1)) for all the cover soils samples examined, as opposed to the four orders of magnitude variation in the soil CH(4) oxidation rates without this pre-incubation (0.9-277 μg CH(4) g(-1) day(-1)). Using pre-incubated soils, a minimum soil moisture potential threshold for CH(4) oxidation activity was estimated at 1500 kPa, which is the soil wilting point. From the laboratory incubations, 50% of the oxidation capacity was inhibited at soil moisture potential drier than 700 kPa and optimum oxidation activity was typical observed at 50 kPa, which is just slightly drier than field capacity (33 kPa). At the extreme temperatures for CH(4) oxidation activity, this minimum moisture potential threshold decreased (300 kPa for temperatures <5°C and 50 kPa for temperatures >40°C), indicating the requirement for more easily available soil water. However, oxidation rates at these extreme temperatures were less than 10% of the rate observed at more optimum temperatures (∼ 30°C). For temperatures from 5 to 40°C, the rate of CH(4) oxidation was not limited by moisture potentials between 0 (saturated) and 50 kPa. The use of soil moisture potential normalizes soil variability (e.g. soil texture and organic matter content) with respect to the effect of soil moisture on methanotroph activity. The results of this study indicate that the wilting point is the lower moisture threshold for CH(4) oxidation activity and optimum moisture potential is close to field capacity. No inhibitory effects of elevated CO(2) soil gas concentrations were observed on CH(4) oxidation rates. However, significant differences were observed for diurnal temperature fluctuations compared to thermally equivalent daily isothermal incubations.
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Affiliation(s)
- Kurt A Spokas
- USDA-Agricultural Research Service, Soil and Water Management, St. Paul, MN 55108, USA.
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