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Changes in Soil Microbial Community Structure in a Tallgrass Prairie Chronosequence

^a Environmental Research Division, Argonne National Lab., Argonne, IL 60439-4843
^b School of Natural Resources and Environment and Dep. of Ecology and Evolutionary Biology, Univ. of Michigan, Ann Arbor, MI 48109
^c Landcare Research, P.O. Box 69, Lincoln 8152, New Zealand

View larger version (27K): [in a new window]   Fig. 1. Microbial community composition assessed by relative abundance of signature PLFAs, with each community summarized to a single point by using a correspondence analysis (CA). Open symbols represent agricultural plots, filled symbols are early succession, and line symbols are later successional prairie plots. Plot ages are growing seasons since the beginning of reconstruction. The angles and lengths of the lines representing environmental variables indicate the direction and strength of the relationship between the environmental variables and ordination scores.

View larger version (17K): [in a new window]   Fig. 2. Distribution of signature PLFAs along Axes 1 and 2 of the correspondence analysis (CA). Axes correspond to those used to summarize microbial community composition (Fig. 1).

View larger version (24K): [in a new window]   Fig. 3. Relationship between relative abundances of bacteria (squares) and total fungi (circles) and positions on ordination Axis 1, in row crop soils (open symbols) and prairie chronosequence soils (filled symbols).

View larger version (22K): [in a new window]   Fig. 4. Relationship between relative abundances of saprophytic fungi (squares) and AMF (circles) and positions on ordination Axis 1, in row crop soils (open symbols) and prairie chronosequence soils (filled symbols).

View larger version (34K): [in a new window]   Fig. 5. The AMF/bacteria ratio in each of the agricultural and prairie sites (mean and standard deviation). Plot ages are growing seasons since the beginning of reconstruction.

View larger version (19K): [in a new window]   Fig. 6. Changes in the saprophytic fungi/bacteria ratio with SOC concentration in (A) row crop soils and (B) prairie chronosequence soils.

View larger version (16K): [in a new window]   Fig. 7. Relationship between the ratio of the sum of cyclopropyls (cy17:0 and cy19:0) to the sum of their precursors (16:17c and 18:17c) and positions on ordination axis 1, in row crop soils (open symbols) and prairie chronosequence soils (filled symbols).