Figure 1.

Vulnerability to cavitation (A) and retention (B) curves of beech stems perfused with NaPO₄ solutions. Fagus stems were perfused with a NaPO₄ solution at pH 4 (black circles) or pH 10 (white circles). Then, the vulnerability (A) and retention (B) curves were established. As a control, a vulnerability curve was scored from stems perfused with a control (CaCl₂ 1 mm + KCl 10 mm, triangles up) and a retention curve was scored from nonperfused stems (triangles down). The data for the vulnerability and retention curves are means (±se) of three and four samples, respectively.