Kenneth Fortino edited ResultsOMMineralization.tex  over 7 years ago

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Due to technical difficulties with the Winkler titration we were not able to get usable dissolved oxygen measurements from the leached litter experiment. In the leached litter SOD experiment the dissolved oxygen concentration ranged between 225.3 and 312.4 $\mu$mol O\textsubscript{2} L\textsuperscript{-1}, which was similar to what was measured in the litter experiment (see above). The mean ($\pm$ SD) dissolved oxygen concentration of the water in the leached litter SOD experiment increased slightly from 234.4 ($\pm$ 13.7) $\mu$mol O\textsubscript{2} L\textsuperscript{-1} to 294.0 ($\pm$ 7.93) $\mu$mol O\textsubscript{2} L\textsuperscript{-1} between days 2 and 9. The mean ($\pm$ SD) dissolved oxygen concentration of the microcsoms without leaf litter was 262.6 ($\pm$ 31.93) which was virtually identical to the mean ($\pm$ SD) dissolved oxygen concentration of the microcosms with leaf litter of 265.8 ($\pm$ 34.66).   The microcosms in the leached litter SOD experiment were incubated at a constant 15.5 \textsuperscript{o}C and the oxygen consumption of the bottles ranged from 360.3 to 788.4 $\mu mol$ O\textsubscript{2} m\textsuperscript{-2} h\textsuperscript{-1} with a median mean ($\pm$ SD)  of 567.9 561.3 ($\pm$ 141.6)  $\mu mol$ O\textsubscript{2} m\textsuperscript{-2} h\textsuperscript{-1}. When the oxygen consumption was normalized to the organic matter mass of the microcosms, we found that the SOD ranged between 27.5 and 68.0 $\mu mol$ O\textsubscript{2} (g organic matter)\textsuperscript{-1} h\textsuperscript{-1} with a median mean ($\pm$ SD)  of 41.6 43.8 ($\pm$ 12.8)  $\mu mol$ O\textsubscript{2} (g organic matter)\textsuperscript{-1} h\textsuperscript{-1}. There were no significant effects (Table \ref{tab:SOD_ANOVA}) of the presence of leaf litter or the days of incubation on the SOD normalized to organic matter content (Fig. \ref{fig:ll.sod}).