Abstract
A subalpine heath soil, a palsa peat, and two iron podsols in Utsjoki, Finland were investigated. Counts of viable aerobic chemo-organotrophic bacteria and yeasts were made together with determinations of dehydrogenase and invertase enzymes, laboratory respiration, nitrogen fixation by acetylene reduction, chemical analyses and decomposition of cotton strips. Each soil was studied at several depths. Of the surface horizons, the podsol under birch was the most active by all the methods used followed in order by the other podsol, the subalpine heath and the palsa peat. Unlike soils under more extreme climatic conditions subarctic soils contain few yeasts.
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