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degradation \citep{Hu_1997,Rui_2009}. The aim of this study is to track the  temporal dynamics of C assimilation through discrete individuals of the soil  microbial community to provide greater insight into soil C-cycling. Our  experimental approach includes the  addition of a soil organic matter (SOM) simulant (a complex mixture of model carbon sources and inorganic nutrients common to  plant biomass), where a single C constituent is substituted for its  $^{13}$C-labeled equivalent, to soil. Parallel incubations of soils amended