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Technischen Universitat Munchen (2005)

Fire Regime and Vegetation Response in the Okavango Delta, Botswana

Heinl, Michael

Titre : Fire Regime and Vegetation Response in the Okavango Delta, Botswana

Das Feuer-Regime und dessen Einfluss auf die Vegetation im Okavango Delta, Botswana

Auteur : Heinl, Michael

Université de soutenance : Technischen Universitat Munchen

Grade : Doktors der Naturwissenschaften (Dr. rer. nat) 2005

Résumé
The scope of the study was to analyse the fire history and the effects of fire on vegetation for the floodplains of the southern Okavango Delta in Botswana. The fire history of the study area was reconstructed by using a series of 98 satellite images from 1989 until 2003 and habitat types based on the flood frequency were separated. Annual extent of fires, main fire season, maximum fire frequency and mean fire frequency related to flood frequency were calculated. The temporal occurrence of fire could be associated to rainfall and flood-events and the interaction of the spatial distribution of fire on different habitat types was discussed. Vegetation response to fire was studied by analysing the relation of vegetation structure and species composition to fire frequency and time-since-fire, as well as by comparing burned and unburned sites. Woody species were shown to be generally negatively affected by frequent fires. Reduced cover values after periods with high fire frequency were also observed for single wetland species. Post-fire succession was shown to be not only driven by the life-history of the occurring species, but also by competition and niche differentiation

Mots clés  : fire ; fire ecology ; fire history ; time-series ; remote sensing ; satellite imagery ; landsat ; vegetation ; vegetation ecology ; landscape ecology ; biodiversity ; succession ; savanna ; wetland ; tropics ; subtropics ; southern African ; Botswana ; Okavango Delta — Feuer ; Feuerökologie ; Feuergeschichte ; Zeitreihe ; Fernerkundung ; Satellitenbilder ; Landsat ; Vegetation ; Vegetationsökologie ; Landschaftsökologie ; Biodiversität ; Sukzession ; Savanne ; Feuchtgebiet ; Tropen ; Subtropen ; südliches Africa ; Botswana ; Okavango Delta

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