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PAH Attenuation relative to 14 C PMC • Specific PAH Ratios to Percent Modern Carbon N3/P2 weathering ratio Increased Weathering 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Heavy No Plants Light Phragmites Occluded Light No Plants Occluded Light Phragmites Heavy Phragmites 1 11 21 31 41 51 % 14 C PMC Light No Plants Plant Carbon PAH
For Density Fractions… • Plant-derived C present in all vegetated density fractions • Light fraction contained most Plant C • Reduced [PAH] were related to inputs of Plant C – Mass loss of PAH for all vegetated density fractions – Mass loss greater for occluded and heavy fractions • Increased 14 C PMC values related to more weathered N3/P3 ratios
Page 1 and 2: Tools to Assess Plant C and PAH C C
Page 3 and 4: Rhizosphere mechanisms that alter o
Page 5 and 6: Tools for OM Characterization • C
Page 7 and 8: Modern Plant Carbon and Petroleum C
Page 9 and 10: Fractionation Methods to Improve C
Page 11 and 12: Changes to OM Composition Character
Page 13 and 14: [PAH] relative to OM changes Plant
Page 15 and 16: Other Indices for PAH Attenuation
Page 17 and 18: PAH Attenuation Weathering Indices
Page 19 and 20: For Humic Fractionations… • Pla
Page 21 and 22: Density Fractionation of SOM Fracti
Page 23 and 24: OM Changes in Density Fractions Gas
Page 25 and 26: N0 N0 N0 BP BP BP ACL ACL ACL ACE A
Page 27: PAH Attenuation in Density Fraction
Page 31: Future Directions… • Can 14C PM

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