The effect of topsoil treatment on the recovery of rocky plain and outcrop plant communities in Namibia
This study is summarised as evidence for the following.
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A controlled study in 2006 in Karoo shrublands in Namibia (Burke 2008) found that addition of topsoil to areas damaged by excavation increased the number of plant species and plant cover, but these were lower than found at a nearby undisturbed shrubland. The number of plant species was higher in areas where topsoil was added (5 species) than in areas where topsoil was not added (2 species), but was not as high as in undisturbed shrubland (15 species). Areas where topsoil was added also had higher vegetation cover (15%) than areas where topsoil was not added (1%) but vegetation cover was higher in undisturbed shrubland (28%). Two previously excavated areas were restored in 2006 by using a bulldozer to add topsoil. Four previously excavated areas did not have topsoil added. The previously excavated areas and nearby undisturbed shrubland were surveyed in October 2006 using a minimum of thirty 1 m2 quadrats in each area.