ИСТИНА

The lack of easily accessible carbon for microorganisms was detected in all investigated soils by the Cmic:Corg ratio despite the high stocks of organic matter. The value of CO2 emission and the Cmic:Corg ratio were site-specific for the region of investigation and may be used as indicators of environmental changes. Peat cryogenic soils represent a unique natural object and provide functional diversity and integrity of northern taiga ecosystems of West Siberia. Soil CO2 emission is one of the major pathways by which CO2 fixed be terrestrial plants is released back into the atmosphere. Understanding of the contribution of polar terrestrial ecosystems in global carbon cycle is very important for the assessment of interaction between ocean, atmosphere and land.