Post-fire changes in nutritional characteristics of sandy podzol in pine forests of the southern taiga

The results of three-year studies of the dynamics of nutritional characteristics of sandy podzols in lichen-mossy pine forests, passed by experimental low fire of medium and high intensity, are presented.
Soil samples for laboratory studies at the control site were taken in the year of the experiment (2002), and they were selected at the burned sites 1 and 2 for the next three years. In this case, the method of mixed samples was used, the nutritional characteristics of which were determined on the infrared analytical system “Infrapid-61”.
Тhe analysis of the obtained results revealed quite noticeable changes in the considered characteristics of sandy podzols, especially in the second section, where the fire had a high intensity. Thus, the active intake of loss in the first post-fire year caused an increase in the content of organic matter and its main components such as carbon and nitrogen in the forest litter. The weakening of all forms of soil acidity with a simultaneous increase in the amount of exchangeable bases and the degree of saturation with them is noted in the entire studied soil stratum and is associated with the intake of easily soluble alkaline elements from ash. The same reason explains the increased content of available forms of phosphorus and potassium, and ammonium nitrogen is explained by increased activity of microorganisms recovered after the fire. At the same time, the humus content in the mineral layers of the podzols has not changed much after the fires. During the next two years, changes in nutritional characteristics, in general, acquire a reverse trend, and, in some cases, are comparable to those at the control site.
Thus, the nature of the post-fire changes of nutritional characteristics of sandy podzols in lichen-mossy pine forests of the southern southern taiga, in general, is close to that previously established in other soil types forest growth conditions. At the same time, some differences in the degree of manifestation of these dynamics were revealed due to different intensity of fires.

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