Savanna, vegetation type that grows under hot, seasonally dry climatic conditions and is characterized by an open tree canopy (i.e., scattered trees) above a continuous tall grass understory (the vegetation layer between the forest canopy and the ground).

Savannas may be subdivided into three categories— wet, dry, and thornbush—depending on the length of the dry season. In wet savannas the dry season typically lasts 3 to 5 months, in dry savannas 5 to 7 months, and in thornbush savannas it is even longer.

Across large parts of the tropical American savannas, the most-common broad-leaved trees are Curatella, locustberries and maricao cimarrons (Byrsonima), and Bowdichia, their place being taken in some seasonally waterlogged sites by the palms Copernica and Mauritia.

It is not surprising, therefore, that most savanna invertebrates—especially termites but also many other arthropods and earthworms—spend most of their lives underground. Fire is an important ingredient in savanna ecosystems in all regions.

2025年2月7日 · Savanna - Tropical, Grassland, Ecosystem: Savannas have relatively high levels of net primary productivity compared with the actual biomass (dry mass of organic matter) of the vegetation at any one time. (For a full discussion of productivity, see biosphere: The photosynthetic process.)

2025年2月1日 · There are three principal types of vegetation from south to north occurring in the coastal savanna, in the forest zone, and in the northern savanna zone.

The three types of grasslands of the world are prairie, steppe, and savanna. Little of the original prairie still bears a mantle of tall grass. Instead, farmers raise a variety of crops on its rich soil. The moister portions of the steppe are cultivated, and the rest is valuable pasture.

2024年12月9日 · The tropical grassland climate overlaps very broadly with that of savanna. As previously stated, these vegetation types differ little from each other, a savanna being merely a grassland with scattered trees. Small changes in management and usage can convert one to …

Soemmering’s gazelle (N. soemmeringii) inhabits the arid savanna country of northeast Africa, where it is the ecological equivalent of Grant’s gazelle. Clark’s gazelle (Ammordorcas clarkei) of northeast Africa is also known as the dibatag.

2025年1月20日 · The coastal savanna zone has an abundance of soil types, including tropical black earths, tropical gray earths, acid vleisols, and sodium vleisols. Except for the tropical black earths, known locally as Akuse clays, most of these soils are of little importance agriculturally.