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Published online 9 January 2007
Published in J Environ Qual 36:120-127 (2007)
DOI: 10.2134/jeq2006.0130
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Tree Root-Derived Substrates and Inorganic Nutrients on Pyrene Mineralization in Rhizosphere and Bulk Soil

Kevin E. Mueller and Jodi R. Shann*

Department of Biological Sciences, University of Cincinnati, Cincinnati, OH 45221-0006


Figure 1
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  		Fig. 1. Inorganic nutrient effects on 14C-pyrene mineralization in soils originally collected from greenhouse pots contaminated with polycyclic aromatic hydrocarbons (PAHs) and planted with red maple. Mean cumulative mineralization was calculated from the radioactivity of 14CO2 evolved from the replicate bottles (n = 5) within each treatment (rhizosphere or bulk soil, amended or not with inorganic nutrients). Since the initial concentration of radioactivity was 103 Bq g–1 soil, the graphed values for cumulative mineralization are approximately equivalent to percentage mineralization.

 

Figure 2
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  		Fig. 2. Initial effects of root amendments on pyrene mineralization in bulk soil. Each replicate received an amendment of 14C-pyrene (103 Bq g–1 soil). For visual purposes, the first 7 d are expanded as an inset.

 

Figure 3
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  		Fig. 3. Extended effects of root amendments on pyrene mineralization in bulk soil (see Fig. 2 for initial effects and study detail). On Day 110 of the study each replicate received a fresh amendment of 14C-pyrene (116 Bq g–1 dry soil).

 

Figure 4
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  		Fig. 4. Mass distributions found in extracts of red maple tree roots. The top panel shows the peaks generated from the electrospray ionization-mass spectrometry (ESI-MS) of an extract with a lower total organic carbon (TOC) (0.2 mg mL–1) content, while the bottom panel is of an extract with twice that amount.

 




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Copyright © 2007 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.