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The Synergism between methanogens and Methanotrophs and the Nature of their Contributions to the Seasonal Variation of Methane Fluxes in a Wetland:The Case of Dajiuhu Subalpine Peatland

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Advances in Atmospheric Sciences 2022年第8期39卷 1375-1385,I0017-I0023页

作者： Luwen WANG Jiwen GE Liang FENG Yaoyao LIU Yu LI Jiumei WANG Xiang XIAO Zhiqi ZHANG Laboratory of Basin Hydrology and Wetland Eco-Restoration China University of GeosciencesWuhan 430074China Hubei Key Laboratory of Wetland Evolution and Ecological Restoration China University of GeosciencesWuhan 430074China Institution of Ecology and Environmental Sciences China University of GeosciencesWuhan 430074China Shennongjia National Park Administration Bureau Shennongjia Forestry District 442417China

Wetland ecosystems are the most important natural methane(CH_(4))sources,whose fluxes periodically ***(methane producers)and methanotrophs(methane consumers)are considered key factors affecting CH_(4)fluxes in ***,the symbiotic relationship between methanogens and methanotrophs remains *** help close this research gap,we collected and analyzed samples from four soil depths in the Dajiuhu subalpine peatland in January,April,July,and October 2019 and acquired seasonal methane flux data from an eddy covariance(EC)system,and investigated relationships.A phylogenetic molecular ecological networks(pMENs)analysis was used to identify keystone species and the seasonal variations of the co-occurrence patterns of methanogenic and methanotrophic *** results indicate that the seasonal variations of the interactions between methanogenic and methanotrophic communities contributed to CH_(4)emissions in *** keystone species discerned by the network analysis also showed their importance in mediating CH_(4)***(CH_(4))emissions in wetlands were lowest in spring;during this period,the most complex interactions between microbes were observed,with intense competition among methanogens while methanotrophs demonstrated better *** patterns manifested themselves in summer when the highest CH_(4)flux was *** formicica was negatively correlated with CH_(4)fluxes and occupied the largest ecological niches in the spring *** contrast,both Methanocella arvoryzae and Methylocystaceae demonstrated positive correlations with CH_(4)fluxes and were better adapted to the microbial community in the *** addition,soil temperature and nitrogen were regarded as significant environmental factors to CH_(4)*** study was successful in explaining the seasonal patterns and microbial driving mechanisms of CH_(4)emissions in wetlands.

关键词： CH_(4)fluxes wetland methanogens methanotrophs molecular ecological network

The Population Features of methanogens and the Biodegradation of Hydrocarbons in Coal Organic Matters

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 446-447页

作者： LI Qingguang JU Yiwen SUN Yue BAO Yuan Key Lab of Computational Geodynamics of Chinese Academy of Sciences College of Earth ScienceUniversity of Chinese Academy of Sciences

methanogens are essential in the formation of biogenic methane and have wide distribution in lakes, swamps, paddy fields and ruminant rumen in the earth surface ecosystem. As a very important greenhouse gas, methane o... 详细信息

关键词： methanogens METHANE COAL ORGANIC compounds MICROBIAL metabolism BIOTRANSFORMATION (Metabolism)

Inhibitory Effect of Chlorinated Guaiacols on Acetate-utilizing methanogens in Anaerobic Digester Sludge

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Inhibitory Effect of Chlorinated Guaiacols on Acetate-utiliz...

Enhancing the efficiency of nitrogen removing bacterial population to a wide range of C:N ratio(1.5:1 to 14:1)for simultaneous C&N removal

第三届全国环境化学学术大会

作者：尹成日吴学高在元延边大学化学系延边大学化学系延边大学化学系

＜正＞正文 Many halogenated organic compounds are toxic and often resist biological and chemical degradation. Chlorinated guaiacols （2-methoxy phenol） are the main compounds （80-90%） of free chlorophenolic compounds formed during chlorine bleaching of pulp. Ten to 100 g of chlorinated guaiacols are discharged per ton of bleached kraft pulp with the spent bleach liquor into recipient

关键词： Anaerobic sludge Chlorinated guaiacols Inhibition methanogens

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 149-163页

作者： Shaswati Saha Rohan Gupta Shradhanjali Sethi Rima Biswas Academy of Scientific and Innovative Research(AcSIR) CSIR-Human Resource Development Centre(CSIR-HRDC)Ghaziabad Uttar Pradesh-201002India Wastewater Technology Division CSIR-National Environmental Engineering Research InstituteNagpur Maharashtra-440020India

High C:N ratio in the wastewater limits biological nitrogen removal(BNR),especially in anammox based *** present study attempts to improve the COD tolerance of the BNR process by associating methanogens with nitrogen removing bacterial(NRB)*** new microbial system coined as‘Methammox’,was investigated for simultaneous removal of COD(C)and ammonia(N)at C:N ratio 1.5:1 to 14:*** ammonia removal rate(11.5 mg N/g VSS/d)and the COD removal rates(70.6 mg O/g VSS/d)of Methammox was close to that of the NRB(11.1 mg N/g VSS/d)and the methanogenic populations(77.9 mg O/g VSS/d),*** activities established that these two populations existed simultaneously and independently in‘Methammox’.Further studies in biofilm reactor fetched a balanced COD and ammonia removal(55%–60%)at a low C:N ratio(£2:1)and high C:N ratio(≥9:1).The population abundance of methanogens was reasonably constant,but the nitrogen removal shifted from mixotrophy to heterotrophy as the C:N ratio shifted from low(C:N£2:1)to high(C:N≥9:1).The reduced autotrophic NRB(ammonia-and nitrite-oxidizing bacteria and Anammox)population at a high C:N ratio was compensated by the fermentative group that could carry out denitrification *** functional plasticity of the Methammox system to adjust to a broad C:N ratio opens new frontiers in biological nitrogen removal of high COD containing wastewaters.

关键词： methanogens Biological Nitrogen Removal(BNR) Simultaneous Methammox C:N ratio

Methanogenic community structure in simultaneous methanogenesis and denitrification granular sludge

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Frontiers of Environmental Science & Engineering 2018年第4期12卷 99-107页

作者： Yujiao Sun Juanjuan Zhao Lili Chen Yueqiao Liu Jiane Zuo College of Water Science Beijing Normal University Beijing 100875 China School of Environment Tsinghua University Beijing 100084 China Envbonmental Engineering Department North China Institute of Science and Tectmology Beijing 101601 China

A laboratory scale up-flow anaerobic sludge bed （UASB） bioreactor ted with synthetic wastewater was operated with simultaneous methanogenesis and denitrification （SMD） granules for 235 days with a gradient decrease of C/N. Molecular cloning, qRT-PCR and T-RFLP were applied to study tile methanogenic community structures in SMD granules and their changes in response to changing influent C/N. The results indicate that when C/N was 20：1, the methane production rate was tastest, and Methanosaetaceae and Methanobacteriaceae were the primary methanogens within tile Archaea. The richness and evenness of methanogenic bacteria was best with the highest T-RFLP diversity index of 1.627 in the six granular sludge samples. When C/N was reduced from 20：1 to 5：1, tbe methanogenic activity of SMD granules decreased gradually, and the relative quantities of methanogens decreased from 36.5% to 10.9%. The abundance of Methanosaetaceae in Archaea increased from 64.5% to 84.2%, while that of Methanobacteriaceae decreased from 18.6% to 11.8%, and the richness and evenness of methanogens decreased along with the T-RFLP diversity index to 1.155, suggesting that the community structure reflected the succession to an unstable condition represented by high nitrate concentrations.

关键词： Simultaneous methanogenesis and denitrifi-cation (SMD) methanogens Community structure Diversity index Granular sludge

Long-term open circuit microbial electrosynthesis system promotes methanogenesis

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Journal of Energy Chemistry 2020年第2期29卷 3-6页

作者： Raúl Mateos Adrián Escapa María Isabel San-Martín Heleen De Wever Ana Sotres Deepak Pant Chemical and Environmental Bioprocess Engineering Group Natural Resources Institute(IRENA)University of LeonLeon 24071Spain Department of Electrical Engineering and Automatic Systems Universidad de LeonLeon 24071Spain Reparation and Conversion Technology Flemish Institute for Technological Research(VITO)Mol 2400Belgium

Microbial electrosynthesis(MES) can potentially provide a mean for storing renewable energy surpluses as chemical energy. However, the fluctuating nature of these energy sources may represent a threat to MES, as the microbial communities that develop on the biocathode rely on the continuous existence of a polarized electrode. This work assesses how MES performance, product generation and microbial community evolution are affected by a long-period(6 weeks) power off(open circuit). Acetogenic and H2-producing bacteria activity recovered after reconnection. However, few days later syntrophic acetate oxidation bacteria and H2-consuming methanogens became dominant, producing CH4 as the main product, via electromethanogenesis and the syntrophic interaction between eubacterial and archaeal communities which consume both the acetic acid and the hydrogen present in the cathode environment. Thus,the system proved to be resilient to a long-term power interruption in terms of electroactivity. At the same time, these results demonstrated that the system could be extensively affected in both end product generation and microbial communities.

关键词： Biocathode Electromethanogenesis Microbial electrosynthesis Microbial community dynamics methanogens Acetogens

A review on microbial metabolism to increase coalbed methane generation and coal pretreatment to improve its bioavailability

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Frontiers of Earth Science 2023年第1期17卷 218-229页

作者： Yang LI Shuheng TANG Jian CHEN Songhang ZHANG School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China School of Energy Resource China University of GeosciencesBeijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism(Ministry of Education) Beijing 100083China Key Laboratory of Strategy Evaluation for Shale Gas(Ministry of Land and Resources) Beijing 100083China

Abundant unminable coal in deep strata and abandoned mines are also precious sources of clean gas energy,under which biotransformation is a potential *** recent years,substantial progress has been made in laboratory research on coal degradation to produce methane by microbial *** paper systematically reviews the research progress of microbial enhancement and microbial stimulation of coal,physicochemical pretreatments of coal,and environmental factors affecting coal *** research idea of coal biotransformation should aim at field production increase and gradually clarify the microbial mechanism of coal degradation and the regional distribution and functional composition of microbial communities on the block *** research on coal biotransformation helps improve the development level of coalbed methane and the sustainable development of unconventional natural gas resources.

关键词： coal biotransformation methanogens microbial mechanism in situ environment carbon cycle

Acclimation of CH_(4)emissions from paddy soil to atmospheric CO_(2)enrichment in a growth chamber experiment

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The Crop Journal 2022年第1期10卷 140-146页

作者： Haoyu Qian Yaguo Jin Jin Chen Shan Huang Yunlong Liu Jun Zhang Aixing Deng Jianwen Zou Genxing Pan Yanfeng Ding Yu Jiang Kees Jan van Groenigen Weijian Zhang Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095JiangsuChina Soil and Fertilizer&Resources and Environmental Institute Jiangxi Academy of Agricultural ScienceNanchang 330200JiangxiChina Jiangxi Key Laboratory of Crop Physiology Ecology and Genetic BreedingJiangxi Agricultural UniversityNanchang 330045JiangxiChina Center of Agriculture and Climate Change Institute of ResourceEcosystem and Environment of AgricultureNanjing Agricultural UniversityNanjing 210095JiangsuChina Jiangsu Collaborative Innovation Center for Modern Crop Production/Key Laboratory of Crop Physiology and Ecology in Southern China Nanjing Agricultural UniversityNanjing 210095JiangsuChina Department of Geography College of Life and Environmental SciencesUniversity of ExeterExeter EX44RJUK

Elevated levels of atmospheric CO_(2)(eCO_(2))promote rice growth and increase methane(CH_(4))emissions from rice paddies,because increased input of plant photosynthate to soil stimulates methanogenic ***,temporal trends in the effects of eCO_(2)on rice growth and CH_(4)emissions are still *** investigate changes in the effects of eCO_(2)over time,we conducted a two-season pot experiment in a walk-in growth *** effects of eCO_(2)on rice leaf photosynthetic rate,biomass,and grain yield were similar between growing ***,the effects of eCO_(2)on CH_(4) emissions decreased over *** CO_(2)increased CH_(4)emissions by 48%-101%in the first growing season,but only by 28%-30%in the second growing *** also identified the microbial process underlying the acclimation of CH4 emissions to atmospheric CO_(2)enrichment:eCO_(2)stimulated the abundance of methanotrophs more strongly in soils that had been previously exposed to eCO_(2)than in soils that had not *** results emphasize the need for long-term eCO_(2)experiments for accurate predictions of terrestrial feedbacks.

关键词： Elevated CO_(2) Methane emissions Rice methanogens Methanotrophs

Rumen microbial degradation of bromoform from red seaweed(Asparagopsis taxiformis)and the impact on rumen fermentation and methanogenic archaea

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Journal of Animal Science and Biotechnology 2024年第1期15卷 412-426页

作者： Pedro Romero Alejandro Belanche Elisabeth Jiménez Rafael Hueso Eva Ramos-Morales Joan King Salwen Ermias Kebreab David R.Yáñez-Ruiz Estacion Experimental del Zaidin Consejo Superior de Investigaciones Cientificas(CSIC)Profesor Albareda 1Granada 18008Spain Department of Animal Production and Food Sciences University of ZaragozaMiguel Servet 177Saragossa 50013Spain Blue Ocean Barns Inc. Redwood CityCAUSA Department of Animal Science University of CaliforniaDavisCA 95618USA

Background The red macroalgae Asparagopsis is an effective methanogenesis inhibitor due to the presence of halogenated methane(CH_(4))analogues,primarily bromoform(CHBr_(3)).This study aimed to investigate the degradation process of CHBr3 from A taxiformis in the rumen and whether this process is *** in vitro batch culture system was used according to a 2×2 factorial design,assessing two A taxiformis inclusion rates[0(CTL)and 2%DM diet(AT)]and two diets[high-concentrate(HC)and high-forage diet(HF)].Incubations lasted for 72 h and samples of headspace and fermentation liquid were taken at 0,0.5,1,3,6,8,12,16,24,48 and 72 h to assess the pattern of degradation of CHBr_(3) into dibromomethane(CH_(2)Br_(2))and fermentation ***,an in vitro experiment with pure cultures of seven methanogens strains(Methanobrevibacter smithii,Methanobrevibacter ruminantium,Methanosphaera stadtmanae,Methanosarcina barkeri,Methanobrevibacter millerae,Methanorhermobacter wolfei and Methanobacterium mobile)was conducted to test the effects of increasing concentrations of CHBr3(0.4,2,10and 50μmol/L).Results The addition of AT significantly decreased CH_(4) production(P=0.002)and the acetate:propionate ratio(P=0.003)during a 72-h *** concentrations of CHBr_(3) showed a rapid decrease with nearly 90%degraded within the first 3 h of *** the contrary,CH_(2)Br_(2) concentration quickly increased during the first 6 h and then gradually decreased towards the end of the *** CHBr_(3) degradation nor CH_(2)Br_(2) synthesis were affected by the type of diet used as substrate,suggesting that the fermentation rate is not a driving factor involved in CHBr_(3)*** in vitro culture of methanogens showed a dose-response effect of CHBr3 by inhibiting the growth of ***,***,***,***,***,***,and *** The present work demonstrated that CHBr_(3) from *** is quickly degrad

关键词： Bromoform metabolism Dibromomethane metabolism Methane mitigation methanogens Rumen microbiota Seaweed