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Isotopic signatures (δ 13C‰) of roots after 13CO2 pulse labeling. Each dot represents a mean of four measures (i.e., not true replicates). Results of δ 13C‰ were obtained for T. repens (squares) and A. capillaris (circles) in experiment A and from A. stolonifera (diamonds) in experiment B. Fitted regression curves are shown. Natural values of δ 13C‰ (control before labeling) were −35 for T. repens roots, −28 for A. capillaris, and −30 for A. stolonifera.
