Effect of oxygen tension on bacterial number in a soil suspension

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Abstract
Growth of three groups of bacteria, strict aerobic, facultative anaerobic and strict anaerobic ones, in soil suspensions when they were incubated under various oxygen tensions was surveyed. Compositional patterns of the three bacterial groups under various oxygen telisions were classified into three types. The first type, observed under higher oxygen tensions than 16 mmHg, is that strict aerobic bacteria dominated. The second type which occurred in the case of incubation under the oxygen tension of 1-2 mmHg, is that the number of aerobic bacteria became almost comparable to that of anaerobic bacteria. The third type, brought about by the incubation under strict anaerobic condition, is that only strict anaerobic bacteria dominated.

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