Growth and survival rate of endemic trees of Ethiopia: Olea africana and Hagenia abysinicca in the degraded lake of Haramaya Watershed, Ethiopia

Abstract

Abstract:The study was conducted to explore the growth and survival rate of the native tree species of Ethiopia, Olea africana and Hagenia abysinicca in the degraded Lake Haramaya Watershed, eastern Ethiopia. Three sub watersheds of Lake Haramaya Watershed, namely: Bachake, Damota, and Tinike were selected purposefully on the basis of their extreme degradation and nearby vanished Lake Haramaya. In each sub watersheds, a total of about 12 main standard quadrats have been applied and the required data has been recorded. The result of the study indicated that Olea africana performs well at Damota sub watershed, accounting 38% of survival rate followed by Tinike sub watershed having a survival rate of 37%. Only 29% of the total planted Olea africana were survived at Bachake sub watershed. Furthermore, it has been revealed via this study that about 55.6% of Hagenia abysinicca were survived at Damota sub watershed. Comparing the survival rate of the two species, Hagenia abysinicca were better withstand and grow under an extreme pressure of local peoples intervention at all sub watersheds. Therefore, the study indicated that growing and maintaining of these two endemic trees in all sub watersheds were difficult task unless much awareness will be made at grass root level. Lastly, the study encourages mega projects on growth and survival rate of other native trees species in the degraded areas of Ethiopia. Keywords: endemic trees, Hagenia abysinicca, Olea africana, sub watershed, survival rateTo cite this article: Sorecha, E.M. 2017. Growth and survival rate of endemic trees of Ethiopia : Olea africana and Hagenia abysinicca in the degraded lake of Haramaya Watershed, Ethiopia.

Effects of Natural Rehabilitation of Degraded Land by Exclosure on Selected Soil Physicochemical Properties in Eastern Ethiopia

“…Mountains and hills in the watershed have no vegetation cover. Scattered remnants of indigenous tree and shrub species including Juniprus procera, Olea africana, Cordia africana and Croton macrostachys were found [24].…”

“…The exclosure of the Tinike watershed is dominated by grasses and Acacia senegal which produce a higher amount of litter, which has increased the accumulation of organic matter in the soil [24]. By contrast, organic carbon content is lower in the open land compared to the exclosure.…”

“…The Lake Haramaya watershed area in Eastern Hararghe Zone of Oromia Region, specifically the Tinike sub-watershed is one of the degraded parts of the watershed due to anthropogenic pressures such as overgrazing of communal land and cultivation of marginal lands [23,24]. To alleviate the problem, local communities established an exclosure as a vital strategy to rehabilitate degraded lands in the watershed.…”

Review on Factors Affecting Early Survival of Tree /Shrub Seedlings and it’s Remedy in Restoration Sites of Ethiopia

“…Contradictory to this, Wolancho (2015), states that maintaining the Eucalyptus species on degraded communal land at the Garato micro-watershed is not suitable for restoration. Sorecha (2017), states that poor growth and survival rates were observed in O. europaea tree species compared to H. abysinica in the degraded lake of the Haramaya rivershed, Ethiopia. Amha et al (2020), also reveals that the integration of S. sesban and A. saligna with a native species plantation of C. africana, J. procera, Millettia ferruginea, and O. europaea subsp.…”