Figure 5.

The raw NMR signal (black squares) and neutron signals measured for volumes above (blue lines) and below (red lines) the NMR detector coil (see Figure 1ii for regions of interest) for both juniper and pinon branches decrease as the deuterated water replaces regular water through the branch. Heavy water was added to the branch at 0 h while regular water was resumed at 2.5 h for the juniper branch. The NMR signals converged to 43 and 27% of their initial values for juniper and pinon, respectively, demonstrating that the majority of the NMR signal is due to water being rapidly transported through the plant. The relatively higher converged value for the juniper may have been limited by the presence of heartwood that was not transporting water (Figure 1iii). The difference in time scales for the two species reflects their respective uptake rates, as given in Table 2, and the duration of the data acquisition.