The nitrogen reserves in sandy podzols after controlled fires in pine forests of Central Siberia

The influence of ground fires of different intensities on the nitrogen pool in the sandy soils under pine forests of the middle taiga zone after their experimental burning was studied. The contents of total nitrogen and its ammonium form increased due to the input of great amounts of plant falloff during the first year after the fire. Within two years after the fire, the content of nitrogen and the percentages of its forms approached their initial values before the fire. The adverse effect of the pyrogenic factor on the biological activity of the sandy podzols was shown.