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.