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Dynamics of a Soil Microbial Community under Spring Wheat

Søren O. Petersen*,a, Pamela S. Frohneb and Ann C. Kennedyb

a Danish Institute of Agricultural Sciences, Dept. Crop Physiology and Soil Science, P.O. Box 50, DK-8830 Tjele
b USDA-ARS, Land Management and Water Conservation Unit, 215 Johnson Hall,Washington State University, Pullman, WA 99164-6421



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  		Fig. 1. Frequency distribution of Biolog substrate utilization patterns with sampling time. Patterns of color formation were assigned to one of three categories on the basis of absorbance readings after 0, 24, 48, and 72 h. The three categories were: cases with a prolonged lag phase (white columns); cases with a sigmoidal shape (grey columns); and cases with no apparent lag phase (black columns). Bars indicate standard deviations (n = 16).

 


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  		Fig. 2. Mole percentage of linoleic acid (18:2{omega}6c) in relationship to the mol percentage of PLFA phospholipid fatty acids representing bacteria (bactPLFA; see text). Data represent all treatments and sampling dates (n = 80).

 


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  		Fig. 3. Cyclopropyl fatty acids (cy17:0 and cy19:0) in relationship to bactPLFA. Data represent all treatments and samplings (n = 80).

 




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