has part savanna TGN:21607 Further axiomatisation is possible with the right taxon imports, but the interspersal semantics may be beyond OWL expressivity. FTT:770 FTT:771 A terrestrial ecosystem which has its composition and function determined by an unbroken herbaceous layer - primarily composed of grasses, sedges, or rushes - interspersed with trees or shrubs. Savanna FTT:259 Savannas are intermediate grassland-woodland ecosystems, with some instances having almost no trees and others having trees at densities higher than some forests. Savannas are typically subject to tropical or subtropical climatic conditions. Savannas typically have seasonal water availability and grass, sedge (Cyperaceae) or rush (Juncaceae) communities. savannah grassland grassland ecosystem woodland ecosystem terrestrial ecosystem