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学科主题: 生物科学::普通生物学
题名: Change of methane production pathway with sediment depth in a lake on the Tibetan plateau
作者: Liu, YQ (Liu, Yongqin)1; Conrad, R (Conrad, Ralf)2; Yao, TD (Yao, Tandong)1; Gleixner, G (Gleixner, Gerd)3; Claus, P (Claus, Peter)2
通讯作者: Liu, YQ
关键词: CARBON-ISOTOPE FRACTIONATION ; ARCHAEAL COMMUNITY STRUCTURE ; STABLE-ISOTOPE ; EUTROPHIC LAKE ; PROFUNDAL SEDIMENT ; ACETOCLASTIC METHANOGENESIS ; WETLAND SOILS ; TEMPERATURE ; HYDROGEN ; BACTERIA
刊名: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
发表日期: 2017
DOI: 10.1016/j.palaeo.2016.06.021
卷: 474, 期:0, 页:279-286
收录类别: SCI
合作性质: 国际
文章类型: Article
类目[WOS]: Geography, Physical; Geosciences, Multidisciplinary; Paleontology ; Physical Geography; Geology; Paleontology
研究领域[WOS]: Physical Geography; Geology; Paleontology
英文摘要: Methane production is the terminal step in the degradation of organic matter in most anoxic lake sediments. It has been suggested that CH4 production in lake sediments is dominated by hydrogenotrophic methanogenesis, especially in deeper layers. We investigated the vertical sediment profile from the surface to 50 cm depth in the sediment of Bangong Co, an oligotrophic high altitude lake on the Tibetan plateau. We measured CH4 production, stable carbon isotopefractionation and the archaeal community structure. We found that the methane production rates, the acetate concentrations and the numbers of bacteria and archaea strongly decreased with sediment depth. The enrichment factor (epsilon) for hydrogenotrophic methanogenesis also decreased with depth, while delta C-13 of acetate stayed fairly constant. The contribution of hydrogenotrophic methanogenesis to total CH4 production increased with depth from similar to 36% to 100%. Analysis of terminal restriction fragment polymorphism (T-RFLP) of archaeal 16S rRNA genes showed that the relative abundance of aceticlastic (Methanosaetaceae) methanogens also decreased with depth disappearing completely at 50 cm depth. Our study firstly showed that the methanogenic pathway and the methanogenic archaeal community systematically changed with sediment depth in a high altitude lake, probably controlled by the availability of easily degradable organic matter. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000399261500022
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/8243
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China.
2.Max Planck Inst Terr Microbiol, D-35043 Marburg, Germany.
3.Max Planck Inst Biogeochem, D-07745 Jena, Germany.

Recommended Citation:
Liu, YQ ,Conrad, R ,Yao, TD ,et al. Change of methane production pathway with sediment depth in a lake on the Tibetan plateau[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2017,474(0):279-286.
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