Figure legends
FIGURE 1: Representative samples of sapwood area staining for
six main shrub encroacher species in a semiarid savanna in Namibia. A)Catophractes alexandri , B) Colophospermum
mopane , C) Dichrostachys cinerea , D)Senegalia mellifera , E) Vachellia nebrownii ,F) Vachellia reficiens .
FIGURE 2: Delineation of sapwood area based on sapwood staining
in C. alexandri. The following areas are outlined by 3 white
lines: A) total area, B) wood area, and C) heartwood area.
FIGURE 3. Allometric relationship between stem diameter
(Dstem) and sapwood area (SA) and relationship between
stem diameter (Dstem) for six main shrub encroacher
species in a semiarid savanna in Namibia. Solid black lines are the
regression lines calculated by the models, dashed black lines are the
95% confidence intervals, and the grey line is the predicted
relationship according to the WBE model (slope = 2.33) (West 1999) with
species-specific intercepts.
FIGURE 4. relative sapwood area (relative SA) for six main shrub
encroacher species in a semiarid savanna in Namibia. Relative sapwood
area is sapwood area divided by the wood area of the cross-section.
FIGURE 5. Relationship between crown area (CA) and total sapwood
area (SAtot) for six main shrub encroacher species in a semiarid savanna
of Namibia. Solid lines are the regression lines calculated by the
models; dashed black lines are the 95% confidence intervals.