Figure 4. a) Precipitation [mm] (focus precipitation
event marked). b) Soil moisture (VWC
[%*h-1]) and groundwater levels (measured every 2
weeks). c) Daily mean sap velocities measured at the maple tree and
daily stem size variation as cumulative increments (measured for the
stem-radius). d) Daily normalized sap velocity
(sapvelocitynorm) and normalized Evapotranspiration
(ETnorm).