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Enhanced Phenanthrene Biodegradation in Soil by Slender Oat Root Exudates and Root Debris

Department of Environmental Science, Policy, and Management, Ecosystem Sciences Div., 151 Hilgard Hall no. 3110, Univ. of California, Berkeley, CA 94720-3110

View larger version (18K): [in a new window]   Fig. 1. Numbers of heterotrophic bacteria over time in control (circle), root debris–amended (square), exudate-amended (triangle), and combined debris + exudate–amended soils (X). LSD = 1.18 x 106.

View larger version (28K): [in a new window]   Fig. 2. Phenanthrene degrading bacteria (LSD = 4.21 x 105) and corresponding soil phenanthrene concentrations over time.

View larger version (43K): [in a new window]   Fig. 3. Ratios of populations in amended and control soils over time for heterotrophic and phenanthrene-degrader communities in (A) debris-amended, (B) exudate-amended, and (C) debris + exudate–amended soils. *P < 0.05.