The microbial biomass and its activity and structure in the soils of old forests in the European Russia |
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| Authors: | E V Stolnikova N D Ananyeva O V Chernova |
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| Institution: | 1.Institute of Physical, Chemical, and Biological Problems of Soil Science,Russian Academy of Sciences,Pushchino, Moscow oblast,Russia;2.Severtsov Institute of Ecology and Evolution,Moscow,Russia |
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| Abstract: | The humus-accumulative layer of soils (podzolic, gray, rzhavozem, burozem, and karbolitozem) of old-age forests (>60–450 years
old) localized in various vegetation subzones (middle-taiga, southern taiga, subtaiga, dark coniferous forests outside the
boreal region, and mountain forests) of the European part of Russia (22 sites of soil sampling of them, 13 in nature reserves
and specially protected territories) was studied. The carbon content of the microbial biomass (Cmic) in the soil was determined by the substrate-induced respiration method. The fungal to bacterial ratio was determined by
the selective inhibition technique with antibiotics. The basal respiration (BR) was also measured. The BR/Cmic = qCO2 ratio and the portion of Cmic in the total organic soil carbon was determined. It was shown that the Cmic and BR in the soils of a separate vegetation subzone varied significantly; however, their values increased from the middle-taiga
to dark coniferous subzone and decreased in the mountain-forest zone (348 ± 44, 670 ± 66, 1000 ± 86, 1142 ± 49, 789 ± 79 μkg
C/g soil and from 0.68 ± 0.23, 1.85 ± 0.10, 2.13 ± 0.15, 1.56 ± 0.14, 0.92 ± 0.07 μkg CO2-C/soil h, respectively). The fungal component in the humus-accumulative layer of soils is 53–99% of the total Cmic; however,
its absolute values increase from the middle subzone to the southern one. The Cmic pool and the total BR in the profile of
some soils (mineral horizons and forest litter) were calculated. |
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