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Microbial Community Profiles and Activities among Aggregates of Winter Fallow and Cover-Cropped Soil

^a Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO 80523
^b Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331

View larger version (44K): [in a new window]   Fig. 1. Change over time in the distribution of soil mass (A) and total Kjeldahl N (TKN) (B) among aggregates of fallow and cover-cropped soil. Within each aggregate size class, means followed by the same letter are not significantly different at P < 0.05.

View larger version (25K): [in a new window]   Fig. 2. Principal components analysis of community FAMEs extracted from aggregates of cover-cropped and fallow soils. For simplification, community positions on PC 1 and 2 are averaged across aggregates size to show sampling date and cover crop effects (A) or by sampling date to show effects of cover cropping and aggregate size class (B). The variance explained by each PC is shown in parentheses.

View larger version (37K): [in a new window]   Fig. 3. Canonical discriminant analysis of selected FAMEs extracted from aggregates of winter-fallow and cover-cropped soil. The canonical functions that discriminate among communities from different aggregate size classes are shown. The variance explained by each canonical function is shown in parentheses.

View larger version (27K): [in a new window]   Fig. 4. Principal components analysis of community substrate utilization patterns from aggregates of cover-cropped and fallow soils. For simplification, community positions on PC 1 and 2 are averaged across aggregates size to show sampling date and cover crop effects (A) or by sampling date to show effects of cover cropping and aggregate size class (B). The variance explained by each PC is shown in parentheses.