Floristic composition and plant community analysis of vegetation in Ilu Gelan district, West Shewa Zone of Oromia region, Central Ethiopia

Abstract

Abstract:This study was conducted on Dirki and Jato sites vegetation in Ilu Gelan district, west Shewa zone of Oromia region, 195 km west of Addis Ababa, to identify floristic composition and plant community types the vegetation. Systematic sampling method was used to collect vegetation data from 54 (20 m × 20 m) plots. To collect data for herbaceous plants, five 1 m × 1 m subplots were laid in each of the main plot, where four were at the corners and one at the center. Cover/abundance values were visually estimated to use for cluster analysis. Shannon -Wiener Diversity Index was used to calculate species diversity, richness and evenness whereas Soresen's Similarity ratio was used to compare the vegetation with other related vegetation. Two hundred and thirteen species were recorded from the sample plots, where Fabaceae, Asteraceae and Poaceae were the most dominant families with 23, 22 and 12 species respectively. Eleven endemic and two near endemic species were recorded from the study area. Based on IUCN Red Data List, nine species were least concern; three were near threatened while one was vulnerable. Three plant community types were recognized from the study area.

Ecological and floristic study of Hirmi woodland vegetation in Tigray Region, Northern Ethiopia

“…High density and frequency coupled with high basal area indicate the overall dominance or high importance of the species for the site (Lamprecht 1989). Species with high IVI in the present study were different from other woodland vegetation studied in Dello Menna woodland (Didita et al 2010), dryland vegetation of Welo (Tadesse et al 2008); but there was some extent of similarities with a species found in woodland vegetation of Gambela region (Awas et al 2001), Metema and Abergele dry woodlands (Eshete et al 2011) and Dawsura-Temben by Woldu et al (2019). This was associated with the topographic gradients and geographical distribution of the species (Clark et al 1998;Whittaker et al 2003).…”

“…This was greater than the density reported from other woodland vegetation studied in Metema, Ethiopia (18.8 stems/ha) (Adamu et al 2012). However, it was less than the study in woodland vegetation of the Borana lowland (3149 stems/ha) (Dale 2004), dry land vegetation of Welo (3146 stems/ha) (Tadesse et al 2008) and Shai Hills dryland in Ghana (959/ha) (Swaine et al 1990). Such variation could be attributed to variations in topographic gradients, habitat preferences and the degree of anthropogenic disturbances (Whittaker et al 2003).…”

“…Herbaceous species, seedlings, and saplings of all woody plants were recorded in a 2 m × 2 m (4 m 2 ) subplot inside each main plot, four from each corner and one at the center. Plants with a height of ≥2 m and DBH ≥2 cm were considered shrubs or trees whereas woody species with height 1-2 m and height ≤1 m were considered saplings and seedlings, respectively (Senbeta and Teketay 2001;Tuxill and Nabhan 2001;Tadesse 2015). Vegetation coverabundance was estimated based on the Van der Maarel scale (1979).…”

“…Environmental variables such as altitude, aspect, slope, and geographical coordinates were taken and recorded for each plot. Soil samples were taken from five points (four from each corner and one from the center) measuring 15 × 15 cm, at a depth of 0-30 cm (Tenkir 2006;Tadesse et al 2008) of the main plot laid for vegetation data collection. These samples were mixed to form a composite sample, and about a kilogram of the sample was taken for analysis.…”

Potensi dan Keragaman Tumbuhan Bawah Non-Kayu Di Lahan Bera Womnowi Distrik Sidey Manokwari

“…Analisis vegetasi menggunakan metode continouse line sampling yang merupakan pengembangan metode garis berpetak dengan model sensus langsung (pendataan di lapangan) (Tadesse et al, 2017). Terdapat tiga hal yang dilakukan: a. Pembuatan Transek; transek dibuat dengan mempertimbangkan struktur vegetasi yang rapat (Terborgh et al, 2008), sehingga diasumsikan dapat mewakili ukuran luas lahan bera.…”