Flora Biodiversity Assessment in Bonga, Boginda and Mankira Forest
Flora Biodiversity Assessment in Bonga, Boginda and Mankira Forest
Flora Biodiversity Assessment in Bonga, Boginda and Mankira Forest
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2002 recorded very low number of seedl<strong>in</strong>gs, 5888, which is almost 10 times less than<br />
the current survey.<br />
A total of 30 species <strong>in</strong> <strong>Mankira</strong>, 36 species <strong>in</strong> Bog<strong>in</strong>da <strong>and</strong> 57 species <strong>in</strong> <strong>Bonga</strong> are<br />
recorded as regeneration. Getachew Berhane <strong>and</strong> Yoseph Assefa <strong>in</strong> IBC, 2002 recorded<br />
27 species for Bog<strong>in</strong>da forest. The result is quite comparable. Ensermu Kelbessa <strong>and</strong><br />
Teshome Soromessa, 2004 reported that 25 species were not represented as regeneration<br />
<strong>in</strong> <strong>Bonga</strong> forest (out of 57). In the current survey 61.4 percent of trees hav<strong>in</strong>g dbh greater<br />
or equal to 10 cm are represented as regeneration <strong>in</strong> <strong>Bonga</strong>. In Bog<strong>in</strong>da 52.8 percent of<br />
trees/shrubs hav<strong>in</strong>g 10 cm <strong>and</strong> above are recorded as regeneration, whereas <strong>in</strong> <strong>Mankira</strong>,<br />
43.5 percent of trees greater than 10 cm dbh are represented as regeneration.<br />
Species such as Cordia africana are not registered as regeneration with<strong>in</strong> the three forest<br />
areas. Probably this is because the species is an early colonizer (Friis, 1992). Croton<br />
macrostacheys too, as pioneer species (light dem<strong>and</strong><strong>in</strong>g), does not encounter adequate<br />
conditions for regeneration <strong>in</strong> a natural forest (Denich, 2006). But on road sides <strong>and</strong><br />
wherever there is an open<strong>in</strong>g, Croton is well grown <strong>and</strong> observed <strong>in</strong> many places. Ficus<br />
species are also not represented <strong>in</strong> regeneration except F. palmata <strong>in</strong> <strong>Mankira</strong>.<br />
From the upper canopy species (Pouteria adolfi-friederici, Ficus species, Syzygium<br />
gu<strong>in</strong>eense, Olea welwitschii, Trilepisium madagascariense, Schefflera volkensii <strong>and</strong><br />
Hagenia abyss<strong>in</strong>ica), Pouteria adolfi-friederici is represented as regeneration with<strong>in</strong> the<br />
three study sites. Trilepisium madagascariense is represented as regeneration with<strong>in</strong> two<br />
of the study sites, <strong>in</strong> <strong>Bonga</strong> <strong>and</strong> Bog<strong>in</strong>da. Syzygium gu<strong>in</strong>eense <strong>and</strong> Olea welwitschii are<br />
represented as regeneration <strong>in</strong> one study site only, <strong>in</strong> Bog<strong>in</strong>da <strong>and</strong> <strong>Bonga</strong>, respectively.<br />
4.3.4 Sapl<strong>in</strong>gs per hectare<br />
Density of sapl<strong>in</strong>gs recorded are 4332 <strong>in</strong> <strong>Bonga</strong>, 11156 <strong>in</strong> Bog<strong>in</strong>da <strong>and</strong> 12796 <strong>in</strong><br />
<strong>Mankira</strong>. Density of sapl<strong>in</strong>gs <strong>in</strong> Bog<strong>in</strong>da <strong>and</strong> <strong>Mankira</strong> are comparable but lesser number<br />
of tree sapl<strong>in</strong>gs is recorded <strong>in</strong> <strong>Bonga</strong>. The reason could be that s<strong>in</strong>ce <strong>Bonga</strong> forest is <strong>in</strong><br />
general denser than the other two forests (refer section 4.3.2), competition might limit<br />
emergence/performance of sapl<strong>in</strong>gs. But with regard to number of trees above 10 cm dbh<br />
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