A growth chamber study was conducted to investigate the fate of pyrene in the rhizosphere of tall fescue (Festuca arundinacea) and switchgrass (Panicum virgatum L.). For this study, 14C-labeled pyrene was used, and distribution of 14C activity was assessed after plant establishment. After 190 days of incubation, 37.7 and 30.4% of 14C-pyrene was mineralized in the soil planted with tall fescue and switchgrass, respectively, while 4.3% mineralization was observed for the unplanted control. Only 7.6 and 8.7% of pyrene was recovered from the soil in the two planted treatments, while 31.5% of pyrene remained in the unplanted control. Significant amounts of 14C were observed for all treatments and controls in the humic/ fulvic fraction of soil at the end of the experiment. This research indicates the potential for pyrene mineralization in planted systems, although the ultimate fate of degradation byproducts is uncertain.
ASJC Scopus subject areas
- Environmental Chemistry