Effects of Environmental Factors on Distribution of Vegetation on the Eastern Slopes of South Welo Highlands
| dc.contributor.advisor | Tegene, Belay( PhD) | |
| dc.contributor.author | Gonsamo, Mengistu | |
| dc.date.accessioned | 2022-05-25T10:44:14Z | |
| dc.date.accessioned | 2023-11-19T12:04:46Z | |
| dc.date.available | 2022-05-25T10:44:14Z | |
| dc.date.available | 2023-11-19T12:04:46Z | |
| dc.date.issued | 1998-05 | |
| dc.description.abstract | The vegetation of the eastern parts of South Welo was studied in three sites at altitudes of 1,200m-1,500m , 1,700111-2,200111 and 2,400111-2,800111 using stratified random sal1lpling. From each zone, 18 stands (quadrats) with 20 m x 20 m were selected randomly and totally 54 sample stands were analyzed in which 144 species of plants were recorded and laler identified in the National Herbarium (Science Faculty). For each stand, composite soil samples were taken from depths of 0-25cm and analyzed for pH. conductivity, texture, organic carbon, total nitrogen, and available phosphonls. Exchangeable cations (Ca, lvlg, K, Na) were analyzed for 5 samples from each zone. Measurement of altitude, slope and soil colour were taken in the field fi'om eadi stana The classificatioll of the 54 stands was conducted by cluster analysis using the computer package SYNTAX. The resemblance index employed was similarity ratio. To analyze species diversity, ShamlOn-Wiever diversity index was employed Using this technique, three major clusters (plant communities): Juniperus-Erica type (cluster A), Euclea schimperi type (cluster B), Acacia asak type (cluster C) in descending altitudinal order and nine subclusters designnted as a, b, c, d, e, j g, hand i were identified (where a and b are in cluster A; c, d and e in eluster B andjg,h and i in cluster C). To compare different clusters and subclusters mean values and one-way ANOVA, followed by Duncan'sINeuman-Keuls mUltiple comparisons were computed The results of the multiple comparison show that the highest number of significant contrasts among the three major clusters were observed fi'om variations in altitudes and related moisture change. Moreover, the three major clusters Significantly vOlY in their texture, organiC carbon, and organiC matter. There is no significant variation in environmental factors between pair of the subclusters within each zone. The analysis of species diversity show that with decreasing altin/de, the richness of vegetatioll in species composition also decrease. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/31790 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Effects of Environmental | en_US |
| dc.title | Effects of Environmental Factors on Distribution of Vegetation on the Eastern Slopes of South Welo Highlands | en_US |
| dc.type | Thesis | en_US |