Results
Isotopic biases between xylem water and bulk stem
water
The δD of CVD-derived bulk stem water was significantly and consistently
more depleted than that of Cavitron-derived xylem water (Figure 1), with
a median δD bias of –14.9\($\textperthousand$\) and values ranging between –20.4 and –8.6\($\textperthousand$\) (Kolmogorov-Smirnov; p<0.01). In contrast, there was no
significant δ18O bias between CVD and Cavitron data,
with δ18O biases centred around 0.3\($\textperthousand$\) and ranging from
–1.7 to 0.9\($\textperthousand$\) (Kolmogorov-Smirnov; p=0.945).