Soil Microbial Respiration in Subtaiga and Forest-Steppe Ecosystems of European Russia: Field and Laboratory Approaches
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L BIOLOGY
Soil Microbial Respiration in Subtaiga and Forest-Steppe Ecosystems of European Russia: Field and Laboratory Approaches N. D. Ananyevaa, *, S. V. Sushkoa, b, c, K. V. Ivashchenkoa, b, and V. I. Vasenevb aInstitute
of Physicochemical and Biological Problems in Soil Science of the Russian Academy of Sciences, Pushchino, Moscow oblast, 142290 Russia b Agrarian-Technological Institute, Peoples’ Friendship University of Russia, Moscow, 117198 Russia cAgrophysical Research Institute, Saint-Petersburg, 195220 Russia *e-mail: [email protected] Received February 10, 2020; revised April 21, 2020; accepted April 27, 2020
Abstract—Our study focuses on testing laboratory measurements of soil microbial respiration as a proxy that in the field conditions. The soil microbial respiration was measured in field (MRfield) and laboratory (MRlab) conditions monthly (from May to October) in subtaiga (mixed forest, meadow) and forest-steppe (broadleaved forest, virgin steppe) ecosystems of the European Russia. The MRfield was determined through soil respiration partitioning by the conventional substrate-induced respiration method. The MRlab was measured as basal respiration of 10 cm topsoil at 22°C and 60% water holding capacity. The contribution of MRfield to total soil respiration varied during the growing season from 25 to 82% for subtaiga and from 41 to 88% for foreststeppe. The MRfield for studied ecosystems varied from 2.2 to 21.7 g СО2/(m2 d), while MRlab was from 3.5 to 18.6 g СО2/(m2 d). Similar results obtained by field and laboratory approaches were in 50% of measurements in the subtaiga ecosystems and in almost 20% of cases on the forest-steppe. The average MRfield and MRlab for growing season did not significantly differ for all studied ecosystems. These findings demonstrate possible prospects of using laboratory measurement of soil microbial respiration during the growing season to approximate and predict average MRfield for various ecosystems. Keywords: soil respiration, partitioning, substrate-induced respiration technique, proxy assessment DOI: 10.1134/S106422932010004X
INTRODUCTION Soil microbial respiration is mineralization of soil organic matter by fungi, bacteria, archaea, and protozoa [1]. Respiration of soil microorganisms together with plant roots is the principal contributor to soil respiration (RS) providing the largest efflux of CO2 from terrestrial ecosystems to the atmosphere [26]. Microbial respiration in contrast root respiration is considering as a key parameter to distinguish soil as a source or sink of the atmospheric CO2 [18]. Global warming is projected to stimulate microbial decomposition of large soil organic carbon stocks and therefore increase the greenhouse effect [4, 12]. The response of soil microbial respiration to climate change can differ between biomes, ecosystems, and soil types [17]. Therefore, for a regional assessment of the carbon budget and its dynamics, it is important to know microbial respiration for various soils and ecosystems. The direct measurement of soil microbia
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