Arid
DOI10.3389/fmicb.2013.00359
Methanogens at the top of the world: occurrence and potential activity of methanogens in newly deglaciated soils in high-altitude cold deserts in the Western Himalayas
Aschenbach, Katrin1; Conrad, Ralf1; Rehakova, Klara2; Dolezal, Jiri2; Janatkova, Katerina2,3; Angel, Roey1
通讯作者Angel, Roey
来源期刊FRONTIERS IN MICROBIOLOGY
ISSN1664-302X
出版年2013
卷号4
英文摘要

Methanogens typically occur in reduced anoxic environments. However, in recent studies it has been shown that many aerated upland soils, including desert soils also host active methanogens. Here we show that soil samples from high-altitude cold deserts in the western Himalayas (Ladakh, India) produce CH4 after incubation as slurry under anoxic conditions at rates comparable to those of hot desert soils. Samples of matured soil from three different vegetation belts (arid, steppe, and subnival) were compared with younger soils originating from frontal and lateral moraines of receding glaciers. While methanogenic rates were higher in the samples from matured soils, CH4 was also produced in the samples from the recently deglaciated moraines. In both young and matured soils, those covered by a biological soil crust (biocrust) were more active than their bare counterparts. Isotopic analysis showed that in both cases CH4 was initially produced from H-2/CO2 but later mostly from acetate. Analysis of the archaeal community in the in situ soil samples revealed a clear dominance of sequences related to Thaumarchaeota, while the methanogenic community comprised only a minor fraction of the archaeal community. Similar to other aerated soils, the methanogenic community was comprised almost solely of the genera Methanosarcina and Methanocella, and possibly also Methanobacterium in some cases. Nevertheless, similar to 10(3) gdw(-1) soil methanogens were already present in the young moraine soil together with cyanobacteria. Our results demonstrate that Methanosarcina and Methanocella not only tolerate atmospheric oxygen but are also able to survive in these harsh cold environments. Their occurrence in newly deglaciated soils shows that they are early colonizers of desert soils, similar to cyanobacteria, and may play a role in the development of desert biocrusts.


英文关键词methanogens desert ecosystems cold climate deglaciations cyanobacteria biological soil crust high-altitude ecosystem stable carbon isotope
类型Article
语种英语
国家Germany ; Czech Republic
收录类别SCI-E
WOS记录号WOS:000331543500001
WOS关键词STABLE-ISOTOPE FRACTIONATION ; RICE FIELD SOIL ; COMMUNITY STRUCTURE ; CLUSTER-I ; GEN. NOV. ; DIVERSITY ; ARCHAEA ; LAKE ; BACTERIAL ; PATHWAYS
WOS类目Microbiology
WOS研究方向Microbiology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/177228
作者单位1.Max Planck Inst Terr Microbiol, D-35043 Marburg, Germany;
2.Acad Sci Czech Republ, Inst Bot, Trebon, Czech Republic;
3.Univ South Bohemia, Fac Sci, Ceske Budejovice, Czech Republic
推荐引用方式
GB/T 7714
Aschenbach, Katrin,Conrad, Ralf,Rehakova, Klara,et al. Methanogens at the top of the world: occurrence and potential activity of methanogens in newly deglaciated soils in high-altitude cold deserts in the Western Himalayas[J],2013,4.
APA Aschenbach, Katrin,Conrad, Ralf,Rehakova, Klara,Dolezal, Jiri,Janatkova, Katerina,&Angel, Roey.(2013).Methanogens at the top of the world: occurrence and potential activity of methanogens in newly deglaciated soils in high-altitude cold deserts in the Western Himalayas.FRONTIERS IN MICROBIOLOGY,4.
MLA Aschenbach, Katrin,et al."Methanogens at the top of the world: occurrence and potential activity of methanogens in newly deglaciated soils in high-altitude cold deserts in the Western Himalayas".FRONTIERS IN MICROBIOLOGY 4(2013).
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