Savanna

Savanna is a unique biome and ecosystem characterized by its distinct open canopy, where trees are sufficiently spaced to allow ample sunlight to reach the ground. This light fosters an unbroken herbaceous layer primarily composed of grasses, creating a vibrant habitat for various species. The savanna can be categorized into four forms: savanna woodland, tree savanna, shrub savanna, and grass savanna, each defined by the density and distribution of trees and shrubs.

Interestingly, savannas maintain an open canopy despite often having a high tree density. Contrary to common belief, many savannas feature trees that are more regularly spaced than those found in forests. For instance, the South American savanna types, such as cerrado sensu stricto and cerrado dense, can have tree densities comparable to or even exceeding those of tropical forests, with figures ranging from eight hundred to three thousand three hundred trees per hectare.

Seasonal water availability is another defining characteristic of savannas, with most rainfall occurring during a specific season. These ecosystems are frequently found in transitional zones between forests and deserts or grasslands, predominantly serving as a bridge from desert to forest. Covering approximately twenty percent of the Earth's land area, savannas thrive in warm to hot climates across regions such as Africa, Australia, South America, and India.