Fig. 1. Examples of six types of savanna grassland based on bedrock
(basalt and granite) and habitat combinations (crests, seasonal rivers,
perennial rivers). A) plot with a high grass cover at basaltic crest
dominated by Bothriochloa radicans with Cenchrus ciliaris ;
B) grass species-rich plot at granitic crest with Urochloa
mosambicensis , Eragrostis superba , Melinis repens andTrichoneura grandiglumis; C) plot at seasonal river on basalt
with abundant Digitaria eriantha , Panicum coloratum andPanicum maximum; D) plot at seasonal river on granite withUrochloa mosambicensis , Panicum maximum andEragrostis cilianensis; E) plot at perennial river on basalt with
a sparse vegetation with Eragrostis rigidior , Urochloa
mosambicensis and Tragus berteronianus ; F) grass species-poor
plot at perennial river on basalts with Sporobolus nitens andTragus berteronianus .