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How can termite mounds change soil fertility in savannas?
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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 savannas, termite mounds significantly influence soil fertility by acting as localized reservoirs for mineral nutrients. Because termites are responsible for decomposing approximately 30 percent of dead organic matter in these ecosystems, they concentrate a large proportion of released minerals within their mounds, where these nutrients are not immediately accessible to plant roots.1
The impact of these mounds on fertility can be observed in several ways:
- Nutrient Redistribution: In regions such as Thailand, research has demonstrated that soil fertility can be markedly improved by mechanically breaking up termite mounds and spreading the nutrient-rich material across the surrounding soil surface.1
- Micro-habitats: In Kenya, the physical structure of old mounds provides elevated, flood-proof sites that support the growth of trees and shrubs, creating a distinct vegetation pattern known as "termite savanna".1
By concentrating organic matter and minerals, termite mounds create small-scale variations in an environment where overall soil fertility is typically low.1