An Ecological Study of The Vegetation of the Ravenna Forest
| dc.contributor.advisor | Tadesse, Kesfin (PhD) | |
| dc.contributor.author | Nigatu, Lisanework | |
| dc.date.accessioned | 2018-07-03T11:45:03Z | |
| dc.date.accessioned | 2023-11-09T04:21:12Z | |
| dc.date.available | 2018-07-03T11:45:03Z | |
| dc.date.available | 2023-11-09T04:21:12Z | |
| dc.date.issued | 1987-06 | |
| dc.description.abstract | An ecological study of the vegetation of the Harenna forest was performed from April 1986 to October 1986. Data on the vegetation and environmental factos were collected, i.e. enumeration of tree and shrub species, an estimate of cover abundance value for herbs, epiphytes and lianes, alti~ tude, edaphic factors and topography. The program GROUPAGE \'las used to summarlze -the vef,eta-tion data. The program CHECK \'las employed to analyse species diversity. Five homogeneous clusters of vegetation were re~ cognized using the presence-absence and quantitative data. The clusters obtained were compared for the mean values of the environmental factors using the statistic t-test. The highest number of significant contrasts among the clusters were observed to result from variation in altitude. Analysis of species diversity showed that with increasing al ti tude, tree and shUl'b species decrease \>I11ile herbaceous species, epiphytes and lianes increase in number. As a result, in the area of the Harenna forest, the main vegetation gradient is caused by differences in altitude associated \'lith variation in moisture. The moisture gradient is accompanied by gradients in soil physical and chemical properties and topography. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/5930 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Biology | en_US |
| dc.title | An Ecological Study of The Vegetation of the Ravenna Forest | en_US |
| dc.type | Thesis | en_US |