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  5. POST-PYROGENIC TRANSFORMATIONS OF FROZEN SOILS OF THE NORTH-EAST OF RUSSIA

POST-PYROGENIC TRANSFORMATIONS OF FROZEN SOILS OF THE NORTH-EAST OF RUSSIA

DOI

10.24411/1728-323X-2018-16101

Section

Physical geography and biogeography, soil geography and landscape geochemistry

Title

POST-PYROGENIC TRANSFORMATIONS OF FROZEN SOILS OF THE NORTH-EAST OF RUSSIA

Сontributors

A. P. Chevychelov, Ph. D. (Biology), Dr. Habil., Chief Researcher, Institute of Biological Problems of the Cryolithozone, SB RAS (IBPC SB RAS), This email address is being protected from spambots. You need JavaScript enabled to view it., Yakutsk, Russia

Abstract

The forests of the plain part of the Russian Northeast are primarily represented by larch woodlands, while the mountainous part is represented by the Siberian dwarf pine communities, which are characterized by high frequency of wildfires. The latter are also characterized by the increased amount of forest fuels (14.07—42.55 tons/ha). Mosses, lichens and litter that belong to the 1st group of fire conductors make up 33—57 % of the total phytomass. Frequent summer thunderstorms are common for the studied area. Thus, the average number of wildfires caused by lightning during summer period makes up 35—49 % of the total number of wildfires. The results of the studies of changes in the permafrost sod-carbonate soil of South Yakutia showed that the total post-fire reduction by 21 cm of this soil is due to a greater extent to the thermal sap of the soil fine earth and to a lesser extent to its surface washout and burnout of the organogenic part of the soil profile. In the permafrost area of the Russian Northeast, especially in humid mountain regions, wildfires cause negative effect on soil cover.

Keywords

wildfires, permafrost landscapes, postpyrogenic changes of soils.

References
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