The role of fungi and bacteria in the mineralization of nitrogen compounds in the soil of the southern taiga birch forest in European Russia
S. M. Razgulin1, L. V. Voronin2
1Institute of Forest Science RAS, Uspenskoe, Russia
2Yaroslavl State Pedagogical University K. D. Ushinsky, Yaroslavl, Russia
Keywords: mycobiota of saprotrophic fungi, bacteria, net ammonification, inhibitory analysis
Abstract
The contribution of fungi and bacteria to the process of net ammonification in the soddy-podzolic soil of the sour-bilberry birch forest of the Yaroslavl region was determined using inhibitory analysis. Representatives of the genera Penicillium Link (70-99 %) and Trichoderma Pers. (6-20 %) dominated in the mycobiota of saprotrophic fungi. Seasonal changes in the total number of fungi and the content of Corg and Norg in the soil correlated only in the eluvial horizon, with r = -0.8 and -0.7. In horizons A0 and A2, total fungal abundance was negatively correlated with nitrogen accumulation, with r = -0.85 - -0.89. It has been established that the litter is characterized by an equal participation of fungi and bacteria in this process. In the humus horizon, a slight excess of the participation of fungi over bacteria was noted. In the eluvial part of the profile, the contribution of bacteria is slightly higher than the contribution of fungi. The maximum air temperature is able to regulate the seasonal dynamics of the number of saprotrophic fungi in the soil.
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