... of the differing definitions and opinions of savanna there is no doubt the term is broad. Superficially savanna is regarded as a 'grassland'. However this general description fails to identify the diversity of the biome. A number of academics have categorised savanna into different sub zones. Werger (1983) defines four formation types. * Grassland - tree coverage is less than 1% of the surface. * Savanna - trees coverage spans from 1 - 10 %. In some areas scrub such as thickets 1 -10%. * Dense savanna - trees or shrub coverage spans 10 - 50%. * Savanna woodland - dominant tree layer. Canopy has a coverage that spans 50-90 %. Some shrubs will appear in undergrowth, there will be some areas of developed grass. There are five factors that together determine what form of savanna is successful at any particular location. These are climate, edaphic, hydrological and geomorphologic factors, fire and grazing ...

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