Kenneth Fortino edited ResultsOMMineralization.tex  over 7 years ago

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\subsubsection{Organic Matter}  The sediments added to the microcosms in the litter experiment had a dry bulk density that ranged between 0.25 to 0.26 g ml\textsuperscript{-1} thus we added between 25 and 26 g dry mass of sediment to the bottles. The organic matter content of those sediments ranged between 12.7 and 12.9\% so the sediments in the microcosms contained between 3.18 and 3.23 g of organic matter each. The microcosms that received leaf litter each received between 0.04 and 0.08 additional g of organic matter with the added leaf litter, which would be the equivalent of 11.3 to 22.7 g coarse organic matter m\textsuperscript{-2}.   At the conclusion of the litter experiment (day 23), neither  the addition of leaf litter nor nutrients affected the percent organic matter of the sediments. The sediments with and leaf litter had between 12.6 and 13.5\% organic matter and the sediments without leaf litter had bettween 12.7 and 13.4\% organic matter. The sediments from microcosms with added DIN and DIP had between 12.6 and 13.4\% organic matter and those with ambient nutrients had between 12.8 and 13.5\% organic matter. The leaves in the litter experiment lost between 21.4 and 63.8 percent of their initial AFDM (median = 36.5\%) during the experiment and there was no effect of the nutrient addition on the leaf mass loss (F\textsubscript{1, 6} = 1.7518, p = 0.2338).  The percent carbon of the surface sediments in the litter experiment ranged between 3.05\% and 3.41\% with a median of 3.18\%. The bulk sediments ranged between 3.12 and 4.27\% C with a median of 3.29 \%. The difference between the bulk sediment \% carbon and the surface sediment \% carbon was small with a range of --0.13 to 1.13\% and a median of 0.09\%. Only 3 samples departed more than 0.5\% and in all of these the bulk sediment had greater \% C. The bulk and surface sediment \% C of the same bottle were uncorrelated (r = -0.12) and the leaf litter or nutrient additions had no effect (p >0.05) on the \% C of either the surface or bulk sediment.