The Microbiology of Some Permafrost Soils in the Mackenzie Valley, N.W.T.

Résumé

Reports on the microbial flora of soil samples obtained in northern Mackenzie District in July 1960. Large numbers of microorganisms were found, more in the tundra-boreal forest transition types than in the tundra, also more in uncultivated than in cultivated soils. Decrease in incubation temperature reduced the numbers of actinomycetes and bacteria in the tundra-boreal forest transition soils but less effect on those from tundra soils and on fungi numbers. Predominance of the various fungi genera isolated however was influenced by temperature.