title: Trimethylamine stimulated and dissolved organic matter inhibited methane production in sediment from the Poyang Lake, China.
abstract: Methane (CH4) emitted from wetlands contributes significantly to the greenhouse effect. The Poyang Lake, the largest freshwater lake in China, is fed by five rivers and connects to the Yangtze River. The area of the lake fluctuates dramatically between drawdown and flood periods with large areas of wetlands. In order to understand the CH4 production capacity and factors that influence CH4 production in the wetland, a static closed chamber combined with a gas chromatograph technique was used to investigate the influence of substrates and electron acceptors on methanogenesis. The results showed that CH4 production capacity of sediments from the Poyang Lake was [Formula: see text] and it was stimulated by trimethylamine (TMA) to a great extent. Incubation temperature played a vital role on CH4 production in sediments and the optimum temperature for methanogenesis was 35°C. Minimum CH4 production capacity occurred with the addition of FeCl3, and the inhibitory effects of electron acceptors decreased in the sequence: FeCl3 > MnO2 > DOM > Fe2O3. In this study, DOM was demonstrated as one of the inhibitors to methanogenesis and TMA was the main substrate of methanogens in the sediments of the Poyang Lake whose pH value is 7.83.
authors.affiliation: a School of Resources, Environmental and Chemical Engineering , Nanchang University , Nanchang , People's Republic of China.
authors.forename: Jiajia
authors.initials: J
authors.lastname: Wang
authors.affiliation: b School of the Tourism and Urban Management , JiangXi University of Finance and Economics , Nanchang , People's Republic of China.
authors.forename: Chunying
authors.initials: C
authors.lastname: Liu
authors.affiliation: a School of Resources, Environmental and Chemical Engineering , Nanchang University , Nanchang , People's Republic of China.|c Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education , Nanchang University , Nanchang , People's Republic of China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Gong
authors.affiliation: d School of Electrical Engineering , Yanshan University , Qinhuangdao , People's Republic of China.
authors.forename: Yuanmu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: a School of Resources, Environmental and Chemical Engineering , Nanchang University , Nanchang , People's Republic of China.|c Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education , Nanchang University , Nanchang , People's Republic of China.
authors.forename: Chunli
authors.initials: C
authors.lastname: Chen
mesh_terms: D002681:China; D019015:Geologic Sediments / Q000737:chemistry*; D057232:Global Warming; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D060106:Lakes; D008697:Methane / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism*; D008744:Methylamines / Q000737:chemistry*; D013696:Temperature; D053833:Wetlands
chemical_list: D006812:Humic Substances; D008744:Methylamines; C023336:trimethylamine; D008697:Methane
keywords: DOM; Methane production; Poyang Lake; TMA; electron acceptors