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process rates can change with community composition CITE. We highlight three  key results in our study with implications for soil C cycling models: (1)  labile and polymeric C decomposers may have similar within group phylogenetic  breadth, (2) soil biomass does not respond \taxit{en \textit{en  masse} to C additions, and (3) trophic interactions among soil bacteria may greatly influence soil C fate.  It is assumed that transformations carried out by functional guilds of