The dynamics of the abundance and distribution patterns of mycelial fungi, yeasts, and bacteria have been studied in the soil of a bilberry–sphagnum birch forest in Yaroslavl oblast, taking into account the biogeochemical background, and the contribution of fungi and bacteria to the net ammonification process is determined using inhibitor analysis. Bacteria are predominant in the birch forest soil (43. 5–98. 7%), while the mycobiota included fungi of the genus Penicillium (1–80%) and yeast (0–88%). A relationship is established between the abundance of all groups of microorganisms and pH, between mycelial fungi and the content of Corg and NH₄^ +, between the C/N ratio and CO2–C emission, and between yeast and soil moisture. The dynamics of the numbers of fungi, yeasts, and bacteria in the upper soil horizon are close and negatively correlated with temporary changes in ammonification (r = –0. 86…–0. 97). In the AT1 horizon, the contribution of fungi to ammonification prevails over bacteria, 208 ± 5 and 121 ± 3 mg N/100 g. In the peaty layer (AT2 horizon), a slight predominance of fungal activity over bacteria is noted: 98 ± 4 and 72 ± 4 mg N/100 g. In the eluvial part of the profile (the A2 horizon), a similar contribution of these groups is obtained, amounting to 8. 7 ± 0. 4 and 9. 7 ± 0. 5 mg N/100 g.
Razgulin et al. (Wed,) studied this question.