| S/no | Vegetation | Land area (km2) | Land area ratio (frequency of occurrence, f) | Average wood bulk density of dominant plant species, D (kg/m3) | Density-frequency Product (fxD) |
| 1 | Sahel savanna | 71,150 | 8 | 703 | 5624 |
| 2 | Sudan savanna | 321,550 | 36 | 694 | 24,984 |
| 3 | Guinea savanna | 376,070 | 42 | 561 | 23,562 |
| 4 | Lowland Rainforest | 89,630 | 10 | 550 | 5500 |
| 5 | Fresh water swamp | 9000 | 1 | 553 | 553 |
| 6 | Mangrove | 15,000 | 2 | 896 | 1792 |
|
|
| 99 |
| 62,015 | |
| Mean value of D = ∑fD/∑f (kg/m3) | 626 | ||||