МИКРОБНАЯ И КОРНЕВАЯ СОСТАВЛЯЮЩИЕ ДЫХАНИЯ ДЕРНОВО-ПОДЗОЛИСТЫХ ПОЧВ ЮЖНОЙ ТАЙГИ

RUSSIAN JOURNAL OF FOREST SCIENCE. 2017, No. 3, pp. 183-195 MICROBIAL AND ROOT COMPONENTS OF RESPIRATION OF SOD-PODZOLIC SOILS IN BOREAL FOREST D.V. Karelin 1,2,3 , D.G. Zamolodchikov 1,3 , V. V. Kaganov 3 , A. V. Pochikalov 1 , M. L. Gitarskii 4 1 Faculty of Biology, Lomonosov Moscow State University Leninskie Gory 1 bldg. 12, Moscow, 119991, Russia E-mail: dkarelin7@gmail.com 2 Institute of Geography, Russian Academy of Sciences Staromonetny ln. 29, Moscow, 119017, Russia 3 Center for Forest Ecology and Productivity of the Russian Academy of Sciences Profsoyuznaya st. 84/32 bldg. 14, Moscow, 117997, Russia 4 Institute of Global Climate and Ecology Glebovskaya st. 20b, Moscow, 107258, Russia Received 6 December 2016 We estimated contribution of microbial community to soil respiration of sodpodzolic soils by the combination of methods of substrateinduced respiration (SIR) and integration of components (IC) in boreal forest of Valdaysky District, Novgorod oblast in 2012-13. In spite of higher accuracy of the SIR we found that combination of two methods allows for better correspondence of soil microbial respiration ( R mic ) to the published estimates based on laboratory experiments. Contribution of microbial respiration differed between wooded and degraded sites. Hence it should be considered separately in upscaling studies in the boreal domain. Note the conservative estimates when applying the IC method outdoors. Among the main controls of R mic were soil temperature at 10 cm depth, month, and mesohabitat. During the vegetation season the contribution of microbial respiration was related to Selyaninov hydrothermal factor. In spite of seasonal and crosshabitat differences in Rmic , it was specific for the certain type of soil and ecosystem. This study was funded by the Russian Science Foundation (grant no. 161700123) and the Russian Foundation for Basic Research (grant no. 160401580). 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