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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grodnitskaya I. D., Trusova M. Y., Syrtsov S. N., Koroban N. V.
Заглавие : Structure of microbial communities of peat soils in two bogs in Siberian tundra and forest zones
Место публикации : Microbiology: Maik Nauka Publishing / Springer SBM, 2018. - Vol. 87, Is. 1. - С. 89-102. - ISSN 00262617 (ISSN) , DOI 10.1134/S0026261718010083
Ключевые слова (''Своб.индексиров.''): 16s rrna gene--bacterial diversity--ch4 and co2 emission--cryogenic conditions--methanogenesis--methanotrophy--microbial biomass and chemoorganotroph respiration--oligo-mesotrophic and polygonal bogs--permafrost--subarctic tundra
Аннотация: The structure and functional activity of microbial complexes of a forest oligo-mesotrophic subshrub- grass-moss bog (OMB, Central Evenkiya) and a subshrub-sedge bog in the polygonal tundra (PB, Lena River Delta Samoylovsky Island) was studied. Soil of the forest bog (OMB) differed from that of the polygonal tundra bog (PB) in higher productivity (Corg, Ntotal, P, and K reserves), higher biomass of aerobic chemoorganotrophs (2.0 to 2.6 times), and twice the level of available organic matter. The contribution of microorganisms to the carbon pool was different, with the share of Cmic in Corg 1.4 to 2.5 times higher in PB compared to OMB. Qualitative composition of the methane cycle microorganisms in PB and OMB soils differed significantly. Methanogenic archaea (Euryarchaeota) in the shrub-sedge PB of tundra were more numerous and diverse than in the oligo-mesotrophic bog (OMB) and belonged to six families (Methanomassiliicoccaceae, Methanoregulaceae, Methanobacteriaceae, Methanomicrobiaceaee, Methanosarcinaceae, and Methanotrichaceae), while members of only four families (Methanosarcinacea, Methanobacteriaceae, Methanotrichaceae, and Methanomassiliicoccaceae) were revealed in OMB. In both bogs, methane-oxidizing bacteria belonged to Alphaproteobacteria (II) and Gammaproteobacteria (I). Methanotroph diversity was higher in OMB than in PB. Microbial communities of PB soils had higher potential activity of methanogenesis and methanotrophy compared to those of OMB. Methanogenic and methanotrophic activities in PB were 20 and 2.3 times higher, respectively, than in OMB. © 2018, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kallistova A.Yu., Kevbrina M.V., Pimenov N.V., Rusanov I.I., Rogozin D.Yu., Wehrli B., Nozhevnikova A.N.
Заглавие : Sulfate reduction and methanogenesis in the Shira and Shunet meromictic lakes (Khakasia, Russia)
Место публикации : Microbiology. - 2006. - Vol. 75, Is. 6. - С. 720-726. - ISSN 00262617 (ISSN) , DOI 10.1134/S0026261706060166
Ключевые слова (''Своб.индексиров.''): archaea--fluorescence in situ hybridization--meromictic lakes--sulfate-reducing bacteria--archaea--armoracia rusticana--bacteria (microorganisms)
Аннотация: The biogeochemical and molecular biological study of the chemocline and sediments of saline meromictic lakes Shira and Shunet (Khakasia, Russia) was performed. A marked increase in the rates of sulfate reduction and methanogenesis was revealed at the medium depths of the chemocline. The rates of these processes in the bottom sediments decreased with depth. The numbers of the members of domains Bacteria, Archaea, and of sulfate-reducing bacteria (SRB) were determined by fluorescence in situ hybridization with rRNA specific oligonucleotide probes labeled with horseradish peroxidase and subsequent tyramide signal amplification. In the chemocline, both the total microbial numbers and those of Bacteria were shown to increase with depth. The archaea and SRB were present in almost equal numbers. In the lake sediments, a drastic decrease in microbial numbers with depth was revealed. SRB were found to prevail in the upper sediment layer and archaea in the lower one. This finding correlated with the measured rates of sulfate reduction and methanogenesis. В© Nauka/Interperiodica 2006.
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