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How do thick bark and underground buds help savanna plants survive fire?
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Savanna
A savanna marked with acacia trees in Serengeti National Park, Tanzania. Africa's Serengeti Plain is commonly used as an example of the savanna biome—a hot, seasonally dry ecological region characterized by an open tree canopy (i.e., scattered trees) above an understory of continuous grasses.
In savanna ecosystems, thick bark and underground buds serve as critical protective mechanisms that allow plants to survive and recover from frequent wildfires.12
- Thick, corky bark: Many savanna trees have evolved thick, fire-retardant bark that acts as a layer of thermal insulation. This protects the tree's vital internal tissues from the intense heat of a blaze, provided the tree has reached a sufficient size.312
- Underground buds: Some plants possess specialized buds located beneath the soil surface. Because the soil provides insulation against the heat of a fire, these buds remain shielded even when the above-ground portions of the plant are destroyed. Following a fire, these protected structures allow for rapid regeneration, enabling the plant to "come back" and produce new growth.312
These adaptations are essential for the survival of many species in fire-prone environments, ensuring that vegetation can persist despite the regular occurrence of natural and human-ignited fires.31