Floristic Composition And Structure Of Yangudi-rassa National Park Vegetation Northeastern Ethiopia

This study was carried out at Yangudi-Rassa National Park, northeastern Ethiopia with the aimrnof compiling floristic composition, vegetation structure and to identify community types. A totalrnof 90 relevés, 20 m x 20 m at 200 m intervals within six transect line were laid to collect the datarnon cover-abundance (for woody species and herbs), DBH, height, density, seedling and saplingrncount (for woody species only). The data on herbaceous species were collected from five, 1 m x 1rnm subplots laid at four corners each and one at the centre of the large relevé. Two Way IndicatorrnSpecies Analysis (TWINSPAN) was used to classify the vegetation community types. Thernimportance value index (IVI) of dominant woody species was estimated and finally, the Shannon-rnWeiner diversity and evenness indices were calculated.rnA total of 70 plant specimens belonging to 25 families and 55 genera were identified of whichrn58.6% were herbs other than grasses, 12.9% were shrubs, 12.9% were grasses, 11.4% were treernor shrub and 4.3% were trees. Two Way Indicator Species Analysis (TWINSPAN) classifiedrnvegetation of the Yangudi-Rassa National Park into seven community types: (I) Cenchrusrnpennisetiformis - Commelina imberbis type; ( II) Chloris virgata - Aristida adscensionis type;rn(III) Heliotropium strigosum - Convolvulus farinosus type; (IV) Caralluma speciosa - Grewiarnvillosa type; (V) Dichrostachys cinerea - Senna italica type; (VI) Heliotropium steudneri -rnDichrostachys cinerea type and (VII) Ziziphus spina-christi - Cleome scaposa type. The Densityrnof woody species with DBH > 2.5cm (ca. 427/ha), basal area (ca. 3.12 m2/ha), frequency of allrnthe tree species (241/ha) and then among the woody plants with higher value of the importancernvalue index (IVI) were Acacia mellifera, Cadaba rotundifolia, Acacia oliveri, and Grewia tenax.rnFinally, the result of Shannon-Weiner diversity and evenness indices showed that communityrntype VII was the most diverse and had the highest species richness. On other hand, Communityrntype VI had the least diverse and least number of species with least even distribution when itrncompared with the other communities. The study indicated that the population structure of thernmost woody plant species in Yangudi-Rassa National Park is in a good state of regeneration butrnpoor recruitment level and there is a need to further investigate on soils and ethno-botanicalrnstudies.rnKey words: Yangudi-Rassa, floristic composition, Structure, plant community

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