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\section{Results and Discussion}  \subsection{Xylose C is assimilated before cellulose C and by different microbial community members in in soil microcosms}   \textbf{Ordination (demonstrates succession, xyl earlier and different than cell)}  \subsection{$^{13}$C from cellulose assimilated by canonical cellulose-degrading and uncharacterized microbial lineages}  \textbf{Who got labeled? (xylose (different OTUs at different times), cellulose)}  \subsection{Putative spore-formers in the \textit{Firmicutes} assimilate $^{13}$C from xylose within first day after soil amendment}  \textbf{Percent incorporation (xylose versus celluose, generalist versus specialist)}  \subsection{Cellulose degrader DNA exhibits greater bouyant density shift upon $^{13}$C incorporation than xylose degraders}  In this study, we couple nucleic acid SIP with next generation sequencing (SIP-NGS) to observe microbial community soil C use dynamics. A series of parallel soil microcosms amended with an identical C substrate mixture, in which the only difference is the identity of the $^{13}$C-labeled substrate, were incubated for 30 days. The C substrate mixture was designed to approximate freshly degrading plant biomass and either xylose or cellulose were isotopically labeled to examine the dynamics of C assimilation for labile, soluble C and insoluble, polymeric C. 5.3 mg of the C substrate mixture per gram soil (including 0.42 mg xylose-C and 0.88 mg cellulose-C g soil$^{-1}$) was added to each microcosm, representing 18\% of the total C present in the soils. Microcosms were harvested at several time points during the incubation period and $^{13}$C assimilation by the microbial community was observed by sequencing 16S rRNA gene amplicons from bulk soil DNA and CsCl gradient fractions (\href{https://www.authorea.com/users/3537/articles/8459/master/file/figures/20140708_ConceptualFig2/20140708_ConceptualFig2.pdf}{Fig. S1}). Xylose degradation was observed immediately, while cellulose degradation was observed after two weeks.  \textbf{Temporal dynamics of C-assimilation in soil.}