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The proportions of total assimilated 13C in (a) plant shoots, (b) roots, (c) the root–shoot (R/S) ratio of assimilated 13C, (d) total soil carbon, (e) microbial biomass carbon (MBC) and (f) soil respiration (CO2) at different petroleum concentrations after being incubated for 24 and 72 h. Values are means ± s.e.
