The useful trees of northern NigeriaLely, Hugh Vandervaes
Science
The useful trees of northern Nigeria
Lely, Hugh Vandervaes
Plants, Useful -- Nigeria, Northern; Trees -- Nigeria, Northern
Savannah also shows many examples of a dominant species, the presence
of which are indications of the composition of a forest. The presence
of this or that species sets a standard of comparative quality to an
area by which it may be valued from various standpoints.
Over wide areas of savannah there are to be found many evidences of
previous peoples in the shape of walled ruins, foundations of corn
stores, grindstones and heaps of hand-picked stones indicative of
cultivation. The dating of such remains gives the approximate age of
the forest growth, and from this evidence it would appear that certain
types of savannah deteriorate considerably with age and that farming
will regenerate them to a certain extent. A comparison of 20-30 year
old forest with the untouched older forest shows the former to be
denser, more healthy and of straighter and more even growth, while
the latter contains a large number of very old trees in a state of
decay, with great open crowns, liable to be blown down by storms, their
branches burned by fires and riddled with fungus. The new growth which
is to take their place consists mostly of grasses, stunted shrubs and
small trees of species which are incapable of forming a canopy. As
mentioned above, provided the area farmed is not too large, the support
given it by the surrounding forests is sufficient to ensure effective
regeneration, otherwise a poorer type takes hold.
In conclusion a short account of the growth and characteristics of
savannah forests is given. As would be expected, the trees, being
subject throughout life to extremely hard conditions, counter with
defensive measures for self-preservation. Most of them are prolific
seeders and many have the habit of retaining their fruits or seeds on
the tree for many months, sometimes right round to the next flowering
season. Germination of seeds is a matter of chance when the tree is
liable to ground fires from October to April or May. The life of a
seedling, too, is precarious, since at the age of six months it may
be subject to a devastating fire. In later life a fire, occurring
in April, may, if the grass is high, burn the bark to ashes on the
outside, destroying all fruits or seeds, killing the twigs and small
branches and apparently destroying all life. Yet, a month later
leaves will spring from all but the burnt tips, the tree losing a
year’s height growth, but in a position to put on another year’s stem
girth. Wounds on the trunk of a tree heal over with the formation of
a hollow or rotten core. Trees 4-5 feet in girth have been felled
and their stems found to consist of a mere shell two or three inches
thick. The hollow is filled either with the workings of termites or
the fermenting sap which is forced up from the ground level and will
pour out of the stump. Savannah trees are adapted to overcome most
of these adverse conditions. Heavy crops of fruit and seed, rapid
ripening of seeds or fire-resisting fruit coats and various means of
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