Fig. 3. Vulnerability curves showing the percentage loss of hydraulic conductivity with decreasing xylem pressure of roots or branches from species from the natural
hardwood forests or from the loblolly pine plantations growing either in the coastal or the Piedmont region of North Carolina, USA. The first and the last two letters of the tree
names represent the first two letters of the genus and species names, respectively. These curves were used to parameterize the model (see Section 2.6).