Savanna
) A range of herbaceous
species have also been introduced to these woodlands,
either deliberately or accidentally including Rhodes grass
and other Chloris species, Buffel grass (Cenchrus
ciliaris), Giant rats tail grass (Sporobolus pyramidalis)
parthenium (Parthenium hysterophorous) and stylos
(Stylosanthes spp.) and other legumes. These
introductions have the potential to significantly alter the
structure and composition of savannas worldwide, and
have already done so in many areas through a numbers of
processes including altering the fire regime, increasing
grazing pressure, competing with native vegetation and occupying previously vacant
ecological niches.
annaabi.ee 
