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Comparative Studies of Actinomycete Populations in Acid Podzolic and Neutral Mull Forest Soils¹

ABSTRACT

A comparison has been made of the actinomycete populations of acid podzol and neutral mull soils under forest cover. In both soils, numbers decreased with depth though less rapidly than did the combined bacteria and fungi; consequently the actinomycetes were, proportionately, slightly more numerous in the lower mineral horizons. The actinomycetes in the podzol were more acid tolerant than those from the mull soils. Approximately two-thirds of the isolates from the podzol grew at pH 4.5 and one-third at pH 4.0. Of the isolates from the mulls, only one-sixth were capable of growth at pH 4.5 and none grew at pH 4.0. Furthermore, the acidic environment restricted actinomycete development to from five to seven "species groups" of Streptomyces.

¹ Contribution from the Department of Microbiology, Ontario Agricultural College, Guelph, Ontario. Presented before Div. V-A, Am. Soc. Agron., St. Louis, Mo. Nov. 27-30, 1961.

² Associate Professor and Professor of Microbiology, respectively.

Received for publication January 14, 1963. Accepted for publication August 13, 1963.