Figure 6. Diel courses of simultaneous radial viscoelastic changes in live bark (dD b) and xylem (dD x) tissue as a result of change in xylem pressure potential (ΨPx) in Eucalyptus tereticornis trees (n = 6). Left-side panels show viscoelastic changes below the girdle, right-side panels show these changes above the girdle; top panels show these changes before (6-10 May) and after (bottom panels; 20-24 May) girdling of tree stems. Output was generated using the mechanistic model described in Material and Methods. Grey sections indicate night-time (19:00–07:00 h).