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

Mary E. Schuttera and Richard P. Dick*,b

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



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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.

 


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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.

 


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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.

 


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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.

 





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Vadose Zone Journal
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The Plant Genome
Copyright © 2002 by the Soil Science Society of America.