Browsing by Author "Regassa Tolcha"

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    An Ecological Study of Vegetation Around Lake Abijata
    (Addis Ababa University, 2005-07) Regassa Tolcha; Bekele Tamrat (PhD); Woldu Zerihun (Professor)
    Ecological study of the vegetation around Lake Abijata was carried out within the principal objective of describing the plant communities of the study site. In order to determine the plant communities five transects were laid from the shoreline to the open land. Along the laid transects, different sized quadrats 1 m2 (for herbs), 25 m2 (for shrubs) and 100 m2 (for woody species) were systematically laid to collect floristic data following a 1-9 modified Braun Blanquet scale (van der Maarel, 1979). All together a total of 143 quadrats were sampled from the study site. Soil samples were taken from the depth of 0-20 cm using soil auger and analyzed for soil pH, electrical conductivity, cation exchange capacity, soil texture and bulk density. Data were analyzed using various multivariate methods, inter alia, TWINSPAN (Two way indicator species analysis), CCA (Canonical Correspondence Analysis) and DCA (Detrended Correspondence Analysis). A total of 97 plant species belonging to 28 families were identified. The TWINSPAN out put showed that there are 6 different plant communities. The distribution patterns of plant species in the study area shows horizontal stratification with the strata being dominated by its dominant species. The distribution patterns of the plant species in the area appears to be governed by soil as the most important environmental factors.