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Scatterplots showing (a) 13C fixation in soil in the dark (note narrow range of Y-axis scale) and (b) detection of 13C in soil incubated under labelled 13CO2 atmosphere with light, and its assimilation by earthworms (A. chl., Allolobophora chlorotica) from mixed or unmixed forest soil. Coloured bars are medians. (Online version in colour.)
