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Accueil du site → Doctorat → Autriche → Regeneration ecology of Erica arborea L. in Simen Mountains National Park and surroundings, North Western Ethiopia

Universität für Bodenkultur Wien (2007)

Regeneration ecology of Erica arborea L. in Simen Mountains National Park and surroundings, North Western Ethiopia

Endalkachew Teshome Abebe

Titre : Regeneration ecology of Erica arborea L. in Simen Mountains National Park and surroundings, North Western Ethiopia

Auteur : Endalkachew Teshome Abebe

Akad. Grad : Dr. nat. techn. Wien, Univ. für Bodenkultur, Diss., 2007

Université de soutenance : Universität für Bodenkultur Wien | Department für Wald- und Bodenwissenschaften | Institut für Waldökologie

Résumé
Erica arborea is the dominant tree of the uppermost forest zone of the Simen Mountains National Park, Ethiopia. Many E. arborea stands of the Simen Mountains are considered endangered due to insufficient regeneration attributed to changes in land use. In this study the influence of disturbances on the stand structure, species composition, density of mature tree, saplings and seedlings, as well as on the soil seed bank were examined, and the causes of seedling mortality, micro site condition and seed germination requirement of E. arborea were investigated at three sites. Six permanent sample plots of 40 m x 40 m size were established at not degraded, moderately degraded and heavily degraded sites, at 12 - 34 km intervals along transects line. For each plot, samples were stratified into 20 m x 20 m sub-plots, which were further divided into 10 m x 10 m sub-plots representing sun exposed and shade locations, which in turn were divided into 1 m x 1 m plots. The mean mature trees density, basal area, DBH, height was 837.5 ha-1, 18.3 m2ha-1, 15.3 cm and 6.9 m respectively. The maximum DBH was 48.7cm and the maximum height 13 m. Only six other wood species were found in the study sites. Regeneration on sun exposed sites was far greater than on shady sites, and the major causes of seedling mortality was drought, grazing and browsing. A gentle slope seedbed was suitable micro-topography, and bare mineral soil and thin mosses cover were suitable micro sites for E. arborea. The overall vertical distribution of the seeds in the soil was similar in all stands, with the highest densities occurring in the upper five centimetres. For the successful germination of E. arborea and Hypericum revolutum charred soil showed great performance than other soils. Fire has a profound positive effect on Erica regeneration through both seeds and vegetative sprouting

Mots clé : Bestandesdynamik / E. arborea L. / Degradation / Simen Mountains Nationalpark / Äthiopien / Naturschutz — Erica arborea L. / Ericaceous vegetation / regeneration / seed bed / Simen Mountains National Park / Ethiopia

Présentation : Österreichische Dissertationsdatenbank

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