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\section{Introductory Paragraph} We explored thedynamics of  microbial contributions to decompositionin soil  by coupling using a sophisticated approach to  DNA Stable Isotope Probing (SIP) and high  throughput DNA sequencing. (SIP).  Our experiment evaluated thedegradative succession  hypothesis, described  dynamicsof carbon (C) metabolism during organic matter  degradation,  and characterized bacteria ecological characteristics of  functionally defined microbial groups  that metabolize labile and structural C in soils. We added to soil  a complex amendment representing plant derived organic matterto soil. We  substituted with either  $^{13}$C-xylose or $^{13}$C-cellulose for their  unlabeled equivalents in two experimental treatments which were monitored for  30 days. Xylose and cellulose are abundant components in plant biomass and to  represent labile and structural C pools, respectively. pools derived from abundant components of  plant biomass.  We found evidence for $^{13}$C-incorporation into DNA from $^{13}$C-xylose and $^{13}$C-cellulose in~49 and~63 operational taxonomic unites units  (OTUs), respectively. The types of microorganisms that appeared $^{13}$C-labeled assimilated  $^{13}$C  in the $^{13}$C-xylose treatment changed over time being predominantly \textit{Firmicutes} at day~1 followed by \textit{Bacteroidetes} at day~3 and then \textit{Actinobacteria} at day~7. Thesedynamics of  $^{13}$C-labeling dynamics  suggest labile C traveled through different trophic levels within the soil bacterial community. levels.  In contrast,the  microorganisms that generally  metabolized cellulose-Cincreased in relative abundance  later (after 14 days) with the highest number of OTUs exhibiting evidence for  $^{13}$C-assimilation  after 14 days. days and did not  change to the same extent in phylogenetic composition over time.  Microorganisms that metabolized cellulose-C belonged to cosmopolitan soil lineages that remain uncharacterized including \textit{Spartobacteria}, \textit{Chloroflexi} and \textit{Planctomycetes}.Using an approach that reveals the C assimilation  dynamics of specific microbial lineages we describe the ecological properties  of functionally defined microbial groups that contribute to decomposition in  soil.