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Appl Environ Microbiol. 1975 February; 29(2): 211-218
Copyright © 1975 American Society for Microbiology. All Rights Reserved.

Ecology of Soil Arthrobacters in Clarion-Webster Toposequences of Iowa

Charles Hagedorn1 and John G. Holt

Department of Bacteriology, Iowa State University, Ames, Iowa 50010

ABSTRACT

Toposequence variations in soil properties were characterized and related to variations in populations of total isolatable bacteria and arthrobacters. Increases in soil NO3-N, available phosphorous, NO3-N-producing power, Arthrobacter counts, and the percentage of the total counts represented by arthrobacters were correlated with decreases in soil acidity. The total bacterial counts were not correlated with soil acidity but were associated with percentage of soil organic matter and percentage of clay. The percentage of the total counts represented by arthrobacters was lowest at the summit position and increased downslope to the highest value in the toeslope position. Factor analysis of the data revealed that 67 to 81% of the total variance exhibited by all variables per site-sampling period could be accounted for by soil acidity, soil structure, soil fertility, soil moisture, and bacterial factors. A selective medium was developed for soil arthrobacters and tested on a wide variety of central Iowa soils to determine its potential as a medium for enumeration as well as isolation. The medium developed in this study was found to be superior to the other available direct-isolation media for soil arthrobacters.

FOOTNOTES

1 Present address: Department of Microbiology, Oregon State University, Corvallis, Ore. 97331.

Appl Environ Microbiol. 1975 February; 29(2): 211-218
Copyright © 1975 American Society for Microbiology. All Rights Reserved.





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Copyright © 1975 by the American Society for Microbiology. All rights reserved.