As a result of ground fires, changes in the physical, chemical and biological properties of soils occur. Pyrogenic changes in soil properties were studied in pure pine forests growing in different natural zones of Ukraine. As a result of both partial and complete combustion of the litter, ash is formed in pine stands after ground fires, which subsequently affects the chemistry of the upper soil layer. Similar features were noted in various natural zones of Ukraine. The intake of ash in the soil led to an increase in the pH of the upper humus horizon. Since this phenomenon is a one-time occurrence, in the future after rains the pH value of the water extract decreased to a natural level. The cause of the pyrogenic changes is the high ontent of alkali metals in the ash. The intensity of changes in the reaction and the content of alkaline cations depend on the level of combustion of the litter. The most noticeable changes occur when the litter is completely burned. These changes are superficial, that is, they are mainly characteristic only of the upper soil layer. At greater depths, the reaction is no different from control.
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