Abstract:
A study was conducted to investigate floristc composition and structural analysis of Forest in
the central highlands of Ethiopia. Systematic sampling method was used to collect vegetation
data from 42 sample plots with 400 m2
(20 m x 20 m) and subplots of 1m2
(1m x 1 m) at the
four corners and the center of the large quadrat for herbaceous plants. All trees with
Diameter at Breast Height (DBH) ≥ 5 cm were measured for height and diameter. A total of
109 plant specie (trees, shrubs, herbs, climber and lianas) 52, 23, 23, 5 and 6 respectively
were recorded. Fabaceae was the most dominant family with 11 species in 3 genera followed
by solenaceae with 6 species each in 3 genera respectively. The density of plant species with
DBH≥ 5cm was (701.2/ha), basal area 17.82m2
/ha). Teclea nobilis Del., Stereospermum
kunthianum Cham, Rhus vulgaris Meikle, Celtis africana Burm.f, Vepris dainellii (Pichi serm) were the most frequently occurred plant species in the forest of the study area. The
density of tree species in langano Forest decreases with increasing height and DBH classes.
The plant species that have the highest importance value index (IVI) were Calpurnia aurea
(Ait.), Benth, Ficus vasta Forssk, Acacia sieberiana DC, Juniperus procera Hochst. Ex Endl,
Euclea divinorum Hiern, Rhus vulgaris Meikle, Stereospermum kunthianum Cham. They
contribute182.14 (62.2%) from a total of 292.86 IVI value. However Nuxia congesta R.Br.ex
Fresen, Eucalyptus camaldulensis Dehnh.., Pittosporum viridiflorum Sims were the lowest
IVI that need conservation priority. The regeneration status of plant was assessed as well as
the specieswhich need high priority protection are listed.
