The ratio of fungi and bacteria in the biomass of different types of soil determined by selective inhibition |
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Authors: | N D Ananyeva E A Susyan O V Chernova I Yu Chernov O L Makarova |
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Institution: | (1) Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow oblast, 142290, Russia;(2) Severtsev Institute of Ecological and Evolutionary Problems, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071, Russia;(3) Moscow State University, Vorobyevy gory 1, Moscow, 103009, Russia |
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Abstract: | Tundra, chernozem (virgin and arable), soddy-podzolic (coniferous forest, meadow, and arable), and grey forest (larch forest) soils were used to separate the contributions of fungi and bacteria to substrate-induced respiration (SIR) with the help of antibiotics. For soils with a high content of organic matter (tundra and chernozem: 12 and 8%, respectively), the procedure of selective inhibition of SIR has been optimized. This procedure consists in application of high concentrations of streptomycin (50–120 mg/g of soil) and cycloheximide (50–80 mg/g of soil) and decreasing the weight of the analyzed soil sample. Soils under study have shown the predominant contribution of fungi (63–82%) to the total SIR. The fungal-bacterial ratio in the soils of natural ecosystems (0–5 cm, without litter) was 4.3, 2.2, 1.5, and 1.5 for tundra soil, virgin chernozem, coniferous (soddy-podzolic soil), and larch (grey forest soil) forests, respectively. The lower layers of soddy-podzolic (5–10 cm) and grey forest (48–58 cm) soils showed a decrease in the fungal and increase in the bacterial component in the total SIR. |
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Keywords: | soil antibiotics fungi bacteria |
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