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Dynamics of Microbial Communities during Decomposition of Carbon-13 Labeled Ryegrass Fractions in Soil

^a Dep. of Crop and Soil Science, Oregon State Univ., Agric. Life Sci. Bldg. 3017, Corvallis, OR 97331-7306
^b Dep. of Microbiology, 220 Nash Hall, Oregon State Univ., Corvallis, OR 97331-3804
^c Biological Sciences, Ecology, Evolution & Marine Biology, Univ. of California, Santa Barbara, CA 93106
^d Dep. of Crop and Soil Sciences, Univ. of Georgia, 3121 Miller Plant Sciences Bldg., Athens, GA 30602

View larger version (26K): [in a new window]   Fig. 1. Principal components ordination of all treatments through all times. Percentage of variance explained is indicated on each axis. Symbols indicate treatments. Ellipses enclose bulk soil and detritusphere samples, which were significantly different from each other based on multi-response permutation procedure (MRPP) analysis.

View larger version (25K): [in a new window]   Fig. 2. Principal components ordination of bulk soil treatments through time. Percentage of variance explained is indicated on each axis. Symbols indicate sampling date. The four plots show: (a) control, (b) leachate, (c) leached straw, and (d) unleached straw treatments. Ellipses enclose samples from early (dashed line) and late (solid line) samplings, with indicator PLFAs for each group listed. No significant temporal trends were observed in the control but significant temporal trends were observed for all amended treatments based on multi-response permutation procedure (MRPP) analysis (p < 0.001).

View larger version (20K): [in a new window]   Fig. 3. Principal components ordination of unleached straw detritusphere through time. Percentage of variance explained is indicated on each axis. Symbols indicate sampling date and dotted arrows show the temporal shifts among sampling dates, which were significant based on multi-response permutation procedure (MRPP) analysis (p < 0.0001). The bold arrow shows the correlation of the fungal/bacterial ratio with respect to the data, with higher ratios associated positively with PC 1 and negatively with PC 2.

View larger version (31K): [in a new window]   Fig. 4. Percentage of substrate-derived C of selected PLFAs through time. Symbols indicate treatments and are means with error bars representing ± SE. The six plots show: (a) 16:0, (b) 18:26,9, (c) i15:0, (d) a15:0, (e) 10Me16:0, and (f) cy19:0.