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Title: FLORISTIC COMPOSITION AND STRUCTURE IN BESCHILLO AND ABAY (BLUE NILE) RIVERINE VEGETATION
Authors: GETANEH, BELACHEW
Date Added: 31-Aug-2007
Abstract: Riverine vegetation along Beschillo and Blue Nile rivers was studied with the aim of compiling floristic composition and describing its plant communities. The area studied occurred between altitudinal gradients of 1324 and 626m. Beschillo is a tributary of Blue Nile River from which the study was started at a point between Mekdela and Tach-Gayint ‘woredas’ in Amhara Regional State (11025.232’ N & 380 42.331’ E) up to the point at which it joins the Blue Nile River (11002.121’ N & 38028.521’ E) and then continued to Sirba Abay (10007.492’ N & 35020.919’ E), which is located in Benishangul-Gumuz Regional State. A total of 580 km was covered to study the riverine vegetation along the two rivers. The data was collected in October and November 2005. Along the rivers, nested belt transects were laid at 500 or 1000 m interval from the riverbank to the adjoining upland. A total of 74 releves were analyzed within 43 transects. The number of plots in each transect was determined by the size of riverine vegetation which laid from the stream edge to the adjoining upland. Cover abundance value for each species was estimated based on Braun- Blanquet approaches as modified by Van der Maarel (1979). The number, height, and diameter at breast height (DBH) >2.5cm were measured for all tree individuals. A total of 205 vascular plant species were recorded of which, 47.32% were herbs, 6.83 % climbers, 22.44% shrubs and 23.41% were trees. A total of 53 Families and 152 Genera were registered, of these 12% were Poaceae, 10% Fabaceae, 5.4% Acanthaceae, 4.9 % Malvaceae and 4.4% Tiliaceae. The output of cluster analysis revealed 6 distinct plant community types. Structural parameters such as Density, Frequency, Dominance, and Important Value Index were calculated. Shannon-Weiner Diversity Index was also computed. The density of tree species per ha was 115 whereas the total basal area (BA) of trees species m2 / ha was 12.6. Most of the tree individuals distributed in middle diameter and height classes.
Description: I would like to express my deepest gratitude to my advisors Prof. Sebesebe Demissew and Prof. Zerihun Woldu for their inspiring guidance, advice, constructive criticism, comments and follow up from problem identification up to competition of this work. I am indebted to members of SES (Scientific Exploration Society) for their support in boat transportation and data collection. I thank the Graduate Studies of Addis Ababa University for its financial support. I am grateful to Department of Biology and National Herbarium of Addis Ababa University for providing materials and facilitating my work. I am sincerely acknowledging the unfailing co-operation of the local people who are living at villages near to Beschillo and Blue Nile rivers in Amhara Regional State, Oromya Regional State and Benishangul-Gumuz Regional State for their support and guidance during data collection. Finally, I wish to thank my family and all my friends for their support and encouragement.
URI: http://hdl.handle.net/123456789/40
Appears in:Thesis - Biology

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