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DOI: 10.5593/SGEM2016/HB33/S03.064

SOIL MICROBIAL ASSEMBLAGES OF CRYOGENIC SOILS IN LARCH STANDS OF CENTRAL SIBERIA

E. Koryagina, S. Evgrafova
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-81-0 / ISSN 1314-2704, 2 - 5 November, 2016, Book 3 Vol. 3, 499-506pp, DOI: 10.5593/SGEM2016/HB33/S03.064

ABSTRACT

The ecological features of microbial assemblages development in Central Evenkia forest soils (64°15’N, 100°13’E) were investigated on permanently installed sites on the right shore of river Kochechum on south- and north-exposition slopes, which differed in intensity of solar radiation, thickness of litter and seasonally thawed soil horison. We studied mineral soil layer 0-5 and 5-10 cm, including ground cover (moss and lichen sinusia). The structure of microbocenoses was examined by method of surface inoculation on Petri dishes, microbial biomass and basal respiration by kinetic methods. According to the study conducted, oligotropic and copiotrophic group of microorganisms dominated in composition of microbocenoses in Central Evenkia cryogenic soils, what was due to the peculiarities of cryogenic soils of this region. Low soil temperatures, periodic soil overwetting and drying, slightly acid reaction of soil environment explained predominant development of bacteria in composition of microbial complexes (87-95%) in comparison with fungi. Our observations showed, that mineralisation processes proceeded more intensively in ground cover of moss sinusia in comparison with lichen sinusia, where the values of mineralisation coefficients were higher in the top mineral soil layers. Microbial biomass of examined cryogenic soils in natural conditions was concentrated mainly in litter subhorison in a moss and lichen sinusia. The analysis of microbial basal respiration revealed similar tendencies. The values of microbial metabolic coefficient revealed high disturbance ratio of ecological-trophic status of microbial communities, when only a small part of microbial pool is metabolically active.

Keywords: cryogenic soils, moss and lichen sinusia, microbial assemblages, microbial biomass and respiration, microbial metabolic coefficient

PAPER DOI: 10.5593/SGEM2016/HB33/S03.064, SOIL MICROBIAL ASSEMBLAGES OF CRYOGENIC SOILS IN LARCH STANDS OF CENTRAL SIBERIA

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