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Question

Difficulty: HardVegetation Zones and Distribution in Nigeria

Match each Nigerian vegetation sub-zone listed on the left with its corresponding ecological characterization and indicator flora on the right.

  • Sahel SavannaXerophytic belt characterized by short tussock grasses and thorny shrubs like Acacia receiving under 500 mm of annual rainfall.
  • Fresh Water Swamp ForestNon-saline deltaic belt dominated by floating aquatic plants and timber species like Abura (Mitragyna stipulosa).
  • Southern Guinea SavannaOpen transition woodland featuring tall grasses and fire-resistant trees such as Lophira lanceolata alongside stream gallery forests.
  • Montane VegetationHigh-altitude biome characterized by short grasses, mosses, and stunted evergreen vegetation above 1,200 meters elevation.

Answer

Sahel Savanna corresponds to the xerophytic belt with short tussock grasses and Acacia receiving under 500 mm rainfall; Fresh Water Swamp Forest corresponds to the non-saline deltaic belt dominated by species like Abura; Southern Guinea Savanna corresponds to the open transition woodland with tall grasses, fire-resistant Lophira lanceolata, and gallery forests; Montane Vegetation corresponds to the high-altitude biome above 1,200 meters featuring short grasses, mosses, and stunted growth.
Each vegetation sub-zone is correctly linked with its environmental parameters and indicator flora: Sahel Savanna with low rainfall (<500 mm) xerophytic scrub; Fresh Water Swamp Forest with non-saline deltaic timber species; Southern Guinea Savanna with tall grasses, fire-resistant woody species, and gallery forests; and Montane Vegetation with altitude-driven (>1,200 m) sub-temperate flora.

Step-by-Step Solution

1
Analyze the climatic constraints and plant adaptations of the Sahel Savanna in northernmost Nigeria.
Identify low annual rainfall (< 500 mm) associated with xerophytic thorny shrubs (Acacia) and sparse tussock grasses.
Arid climate limits vegetation height, canopy closure, and species diversity.
2
Differentiate Fresh Water Swamp Forest from coastal saltwater Mangrove swamps in southern Nigeria.
Identify non-saline riverine wetland conditions supporting timber species like Abura (Mitragyna stipulosa) without stilt-root adaptations.
Fresh river discharge dilutes coastal salinity beyond tidal reach.
3
Evaluate the vegetation structure of the Southern Guinea Savanna belt.
Identify tall grasses, fire-resistant trees like Lophira lanceolata, and riverine gallery forests.
Seasonal bush burning and moderate rainfall (1,000–1,500 mm) shape this woodland-grassland mosaic.
4
Examine the highland environmental drivers responsible for Montane Vegetation in Nigeria.
Associate high altitude (> 1,200 m) on plateaus with cool microclimates supporting mosses, stunted trees, and sub-temperate grass species.
Environmental lapse rate reduces temperature with altitude, overriding latitudinal temperature norms.

Key Concept

Ecological Adaptations and Spatial Boundaries of Nigerian Vegetation Zones
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Topics

Vegetation Zones and Distribution in Nigeria

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