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Difficulty: MediumVegetation Zones and Distribution in Nigeria

Arrange the following vegetation zones of Nigeria in sequential order of decreasing average annual rainfall, starting from the zone with the highest rainfall to the zone with the lowest rainfall:

  1. 1Mangrove Swamp Forest
  2. 2Lowland Rain Forest
  3. 3Guinea Savanna
  4. 4Sudan Savanna
  5. 5Sahel Savanna

Answer

The correct sequence from highest to lowest annual precipitation is: Mangrove Swamp Forest, Lowland Rain Forest, Guinea Savanna, Sudan Savanna, and Sahel Savanna.
Nigeria's vegetation belts correspond directly to the South-to-North rainfall gradient driven by the Tropical Maritime air mass. The Mangrove Swamp Forest along the Atlantic coast receives over 2,500 mm of annual rainfall. Moving inland, the Lowland Rain Forest receives 1,500–2,500 mm. Continuing northward into the middle belt, the Guinea Savanna receives 1,000–1,500 mm, followed by the Sudan Savanna in the north receiving 600–1,000 mm, and finally the Sahel Savanna near the northern frontier receiving under 600 mm.

Step-by-Step Solution

1
Identify the coastal vegetation zone receiving maximum precipitation in Nigeria.
Mangrove Swamp Forest experiences the highest mean annual rainfall (> 2,500 mm) due to direct coastal exposure to moisture-laden Tropical Maritime air masses.
Coastal geography places this zone at the entry point of rain-bearing winds.
2
Trace the moist forest zone lying immediately inland from the coast.
Lowland Rain Forest forms the second tier, receiving 1,500 mm to 2,500 mm of annual rainfall.
Rainfall declines gradually as moisture-bearing winds move inland from the Atlantic Ocean.
3
Locate the middle belt savanna zone.
Guinea Savanna receives moderate precipitation of 1,000 mm to 1,500 mm per year.
This region represents a major transition zone between high-rainfall southern forests and drier northern savannas.
4
Order the remaining northern savanna belts by latitude and moisture availability.
Sudan Savanna receives 600 mm to 1,000 mm annually, followed by Sahel Savanna in the extreme north which receives under 600 mm annually.
Precipitation systematically decreases with distance from the ocean as latitudinal distance toward the Sahara increases.

Key Concept

Precipitation and latitudinal gradients governing vegetation belt distribution in Nigeria
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Topics

Vegetation Zones and Distribution in Nigeria

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