MICROBIAL BIOMASS CARBON, NITROGEN AND PHOSPHORUS IN TUNDRA SOILS OF NORTHERN FENNOSCANDIA
Abstract
Microbial biomass in the soil is an important factor in determining the direction and intensity of biogeochemical processes. We report quantitative estimation of microbial biomass carbon, nitrogen and phosphorus in tundra soils of northern Fennoscandia. It is found that the content of microbial biomass carbon and nitrogen in the soil of plane tundra is higher than that in the soil of mountainous tundra, which reflects their relationship with the total content of C and N in the soil. The difference in the contents of microbial biomass phosphorous in the soils studied is virtually indistinguishable. We have estimated the fraction of the microbial biomass elements in the total content of carbon, nitrogen and phosphorous in tundra soils. It is shown that for surface organic horizons the fraction of microbial biomass carbon ranged from 0.6 to 0.9% of the total pool of soil carbon. The content of microbial biomass nitrogen is 1 - 1.2% and of phosphorus - from 6 to 35%. At the same time the concentration of microbial biomass phosphorus is the greatest in soils containing a minimal amount of phosphorus.
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