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首页> 外文期刊>Aquatic Sciences >Methane in an acidic bog lake: The influence of peat in the catchment on the biogeochemistry of methane
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Methane in an acidic bog lake: The influence of peat in the catchment on the biogeochemistry of methane

机译：酸性沼泽湖中的甲烷：集水区泥炭对甲烷生物地球化学的影响

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摘要

Methanogenesis, an anaerobic microbial process in sediments, was investigated in a naturally acidic bog lake, Grosse Fuchskuhle, in northeastern Germany. The lake was artificially divided into four sub-basins: two western basins receiving humic substances from an adjacent Sphagnum bog and two eastern basins isolated from this acidic inflow with installed curtains. Within the northeast (NE) and southwest (SW) basin compartments, one of each group were studied. In the peat influenced western basins the pH-values in the water columns were kept low and increased in the others. The stratification period increased in all four compartments from some weeks to some months, from April to October, with the development of anoxic hypolimnia in all compartments after the installation of the curtains. The layer with the most active methane production moved from a sediment depth of more than 20 cm before separation to close to the surface sediments in all compartments. Methanogenic micro-organisms were found in the whole sediment core - from surface sediments to a depth of 25 cm. The proportion of methanogens was approximately 15% of total microbial cell numbers, which were approximately 2 x 10~6 cells/ml sediment. Oligonucleotide probes targeting nearly all families of the phylum Euryarchaeota were tested with fluorescence in-situ hybridization (FISH). In both basins, with and without the influence from peat, oligonucleotide probe (MSMX) targeting Methanosarcinaceae could be detected only as methanogens. The finding of only acetate-using methanogens by FISH indicated acetate as a major methanogenic substrate. Concentration profiles of CH_4 as a function of sediment depth were characterized in both basins by high concentrations in the top layers. Methane bubbles were released in the late summer in the eastern sub-basin only, likely from oversaturation in the surface sediments.
机译：甲烷生成是沉积物中的厌氧微生物过程，在德国东北部的天然酸性沼泽湖格罗斯·福斯库赫勒（Grosse Fuchskuhle）中进行了研究。该湖被人为地分为四个子盆地：两个西部盆地从相邻的泥炭藓沼泽接收腐殖质，另外两个东部盆地则通过安装了帘子的酸性流入隔离开来。在东北（NE）和西南（SW）盆地区划中，研究了每组之一。在受泥炭影响的西部盆地，水柱中的pH值保持较低水平，而其他pH值则升高。从四月到十月，从四个星期到几个月，所有四个隔室的分层期都增加了，并且在安装了窗帘之后所有隔室都出现了缺氧性低氧血症。甲烷产生最活跃的层在分离前从沉积物深度超过20厘米移动到靠近所有隔室的表层沉积物。在整个沉积物核中发现了产甲烷微生物-从表面沉积物到25厘米深。产甲烷菌的比例约为总微生物细胞数的15％，约为2 x 10〜6细胞/ ml沉淀物。使用荧光原位杂交（FISH）测试了针对几乎所有Euryarchaeota门科的寡核苷酸探针。在这两个盆地中，无论是否受到泥炭的影响，都只能将靶向甲烷菌的寡核苷酸探针（MSMX）检测为产甲烷菌。 FISH仅发现使用乙酸盐的产甲烷菌，表明乙酸盐是主要的产甲烷底物。在两个盆地中，CH_4的浓度分布与沉积物深度的关系通过顶层的高浓度来表征。甲烷气泡仅在夏末在东部子盆地释放，可能是由于表层沉积物过饱和所致。

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