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).