МИКРОБИОЛОГИЧЕСКАЯ ТРАНСФОРМАЦИЯ УГЛЕРОДА СН4 и СО2 В КРИОГЕННЫХ ПОЧВАХ ТУНДРОВЫХ И ЛЕСНЫХ ЭКОСИСТЕМ СИБИРИ

RUSSIAN JOURNAL OF FOREST SCIENCE. 2017, No. 5, pp. 111-127 MICROBIAL TRANSFORMATION OF CARBON CH4 AND CO2 IN PERMAFROST-AFFECTED SOILS IN TUNDRA AND FOREST ECOSYSTEMS IN SIBERIA I. D. Grodnitskaya 1 , S. Y. Evgrafova 1 , G. I. Antonov, S. N. Syrtsov 1,2 , D. E. Aleksandrov 1 , M. Y. Trusova 3 , N. V. Koroban 4 1 Forest Institute, Siberian Branch of the Russian Academy of Sciences Academgorodok, 50, bldg. 28, Krasnoyarsk, 660036, Russia E-mail: igrod@ksc.krasn.ru 2 Krasnoyarsk filial of the Information and Methodological Center for Expert Evaluation, Recording and Analysis of Circulation of Medical Products, Roszdravnadzor Kutuzova st., 1, bldg. 1, Krasnoyarsk, 660050, Russia 3 Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences Academgorodok, 50, bldg. 50, Krasnoyarsk, 660036, Russia 4 Roche Diagnostika Rus Ltd. Letnikovskaya, 2, bldg. 2, Moscow, 115114, Russia Received 5 April 2016 We studied structure, dynamics and functional (biogeochemical) activity of microbial complexes of cryogenic soils in larch forests in Central Evenkia and polygonal tundra on Samoilovskii Island, Lena Delta. We found that daily flux of methane from soil surface is 3-5 times less in forest soil than in the center of polygon in tundra. Short-term heating to 18.5-22.5°C of permafrost-affected soil in larch forest caused sweetening of soil solution, shrinkage of eco-trophic groups of microorganisms and microbial biomass, as well as increase in greenhouse gases (CO 2 and CH 4 ) emission to the air. Notably the permafrost-affected soil on sandy deposits in tundra had highest microbial diversity of methanogenic archaea including Methanobacteriaceae , Methanomicrobiaceae , Methanosarcinaceae , Methanosaetaceae families. On the other hand only Methanosarcinacea were found in cryosols of larch forest. 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