Figure 4: Results of mixing calculations assessing the mixture
of water from recent precipitation (from the last 30 days before
sampling, shown in light blue) and bulk soil water (sampled at the day
of xylem sampling) for all depths (in grey), shallow soil water (10 and
20 cm, in light grey) and deep soil water (40 and 80 cm, in dark grey)
for beech (a) , spruce (c) and young spruce(e). Distributions of isotope ratios in xylem, precipitation
and bulk soil water samples for each sampling date for beech(b) , spruce (d) and young spruce (f) . The
dashed lines indicate the mean precipitation signatures for summer and
winter precipitation in light blue and yellow, respectively.
Table 1: Mean δ2H isotopic composition of
precipitation in the 30 days preceding the xylem sampling (P), bulk soil
water in the shallow (soilshal - 10 and 20 cm) and deep
soil (soildeep - 40 to 80cm), as well as in beech,
spruce and young spruce xylem, with a qualitative assessment of the
likely main water sources found in xylem waters. Please note that bulk
soil sampling at 80cm only started on 05th July 2021.