Figure 4: Initial (1 d before the labeling) and incorporation of the 13C label into the bulk organic matter (Δδ13Cbulk) of different pine (Pinus sylvestris ) and mistletoe (Viscum album ssp.austriacum ) tissues under different removal treatments (i.e. pine needle removal for pine phloem and xylem, mistletoe leaf and shoot; mistletoe removal for pine needle, phloem and xylem). Girdled branches were exposed to 13C-enriched CO2(shaded area) for 3.5 h. Dashed lines (d, e) are used to indicate where the Δδ13C values of mistletoe leaves and shoots showed a significant difference (P<0.05) between irrigated and non-irrigated trees (see Table 2). Different letters indicate significant differences among treatments at the same sampling time (n = 3). Please note the difference in scale of the x-axis before and after the red break points
and the difference in y-axis scale among panels.