SSSAJ -- Clay et al. 71 (3): 1003 Figure IG3

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Fig. 3. Diagram showing the impact of plant type (C₃ and C₄ plants) and ¹³C fractionation (Rayleigh fractionation coefficeint ${varepsilon}$ = 0 and ${varepsilon}$ < 0) on the relative pool sizes of relic soil organic C (SOC) and unharvested biomass remaining in soil after mineralization. PCR = plant C retained.