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C assimilating, gram-positive spore-formers. Hence, trophic interactions  among soil bacteria may be of importance in soil C turnover models.  How -- or if -- phylogenetic composition affects SOM dynamics is an open  question CITE. Phylogenetic composition could affect SOM dynamics if SOM  transformations were not functionally redundant traits and if biology is rate  limiting for key C transformations CITE. Alternatively, even with functional  redundancy resource allocation at the cell level can influence SOM fate and  turnover CITE. It is likely that the ability to carry out soil  C transformations are redundant within and between soil microbial communities.  However, we demonstrate phylogenetically coherent response to soluble  C additions. For instance, most of the initial response to xylose can be  attributed to aerobic spore formers. Assuming cellular resource allocation is  consistent with phylogeny, it is possible that phylogenetic composition can  significantly influence SOM dynamics. Aerobic spore-formers, for example, are  found in different proportions across soil biomes CITE and even within regional  agricultural soils CITE Berthrong. If present and abundant, aerobic  spore-formers may be primary soluble C decomposers and allocate C in specific  quantities into intra and extracellular C components. Although, not  demonstrated in this study, the allocation of C from soluble, labile pools  in a soil without or under conditions not suitable for aerobic  spore-formers may be significantly different. Polymeric C, on the other hand,  did not show the same phylogenetic coherence as soluble C decomposition in this  study. This suggests that resource allocation among cellulose degraders would  not have a single phylogenetic signal. Cellulose degraders as a whole likely  allocate C differently than labile C degraders though. Also, it seems likely  that a rod morphology like \textit{Cellvibrio} would have a different  ecological and perhaps resource allocation strategy than a gliding  \textit{Bacteroidetes} or \textit{Chloroflexi} cellulose degrader.  \subsection{Conclusion}   % Fakesubsubsection:SOM represents more C than the  Microorganisms sequester atmospheric C and respire soil organic matter (SOM)