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.