Figure 4. Radial movement measured on live bark and sapwood in
six Eucalyptus tereticornis trees. Left-side panels show data
were recorded below the girdle, right-side panels show data recorded
above the girdle before (top panels; 6-10 May) and after (bottom panels;
20-24 May) all bark was removed 60 cm above the stem base. Data recorded
on live bark (black line) contain the combined signals of reversible
(dD b) and irreversible
(dD Gempir) expansion of live
bark and the cambial region (see text for more details), while those
recorded on sapwood (grey line) represent reversible expansion of xylem
(dD x) only. Panels (e) and (f) depict
irreversible growth of stems based on interpolated dendrometer
measurements that contain hydraulic and osmotic signals
(D Gempir) and those that have
been stripped of these signals (D G+). Grey
sections indicate night-time (19:00-07:00 h).