2.3 Leaf water potential measurements
Measurements of leaf water potential were required to develop the modelling routine for predicting radial movement in stems (see sectionStem hydraulic model below). Three leaves from the top crown region of all six trees were collected during midday of 20 February, 4 March, 26 March, 24 April and 14 May 2014. Immediately after collection, leaves were placed in plastic bags that contained moist paper towels. Plastic bags were transferred to the laboratory in a dark icebox. Their water potential was measured within 30 minutes after collection using a pressure chamber (1505D, PMS Instrument Company, Albany, USA). Results from these measurements are provided as Supporting Information (Table S2).