Euston-Brown, D., Rathogwa, N & Richardson ... - DWA Home Page

Figure 3b also illustrates how the initial stacking treatment at Hilltop resulted in a higher recovery of
chromolaena in 2006, but not for the no stacking treatments.
Figure 4: Theuns Botha site. Herb diversity in 10 m radius plots in 2004, 2005 and 2006. (r 2 = 0.4290; r = 0.6550,
p = 0.0000; y = -7636.7153 + 3.8125*x)
Figure 4 above show how indigenous herb diversity declined after the initial clear but two years later
(in 2006) herb diversity had increased significantly.
Figure 5: Theuns Botha site. Chromolaena cover (%) showed a significant decrease over three years for all
treatments. (r 2 = 0.4077; r = -0.6385, p = 0.000000002; y = 48974.4397 - 24.4062*x)
At Theuns Botha the average grass cover across all sites was not significantly different between 2004
and 2005, but in 2006 the average grass cover (72 %) was almost twice as much as the grass cover in
2004 (Figure 1). The density of chromolaena seedlings in 2006 was about eleven times less than its
density in 2004 (Figure 7).
The Hilltop sites also produced interesting results. At this site the dense infestation of chromolaena in
the surrounding area was not cleared (while at Theuns Botha sites the cromolaeana surrounding the
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