oa Koedoe : African Protected Area Conservation and Science - Classification and mapping of the composition and structure of dry woodland and savanna in the eastern Okavango Delta : original research



The dry woodland and savanna regions of the Okavango Delta form a transition zone between the Okavango Swamps and the Kalahari Desert and have been largely overlooked in terms of vegetation classification and mapping. This study focused on the species composition and height structure of this vegetation, with the aim of identifying vegetation classes and providing a vegetation map accompanied by quantitative data. Two hundred and fifty-six plots (50 m x 50 m) were sampled and species cover abundance, total cover and structural composition were recorded. The plots were classified using agglomerative, hierarchical cluster analysis using group means and Bray-Curtis similarity and groups described using indicator species analysis. In total, 23 woody species and 28 grass species were recorded. and were the most common woody species, whilst and were the most widespread grasses. Eleven vegetation types were identified, with the most widespread being Short mixed mopane woodland, Tall mopane woodland and Tall mixed mopane woodland, covering 288.73 km2 (28%), 209.14 km2 (20%) and 173.30 km2 (17%) of the area, respectively. Despite their extensive area, these three vegetation types were the least species-rich, whilst Palm thornveld, Short mixed broadleaf woodland and Open mixed woodland were the most taxonomically variable. By contrast, Closed mixed woodland and Closed woodland had the most limited distribution, accounting for less than 1% of the mapped area each.

The dry woodland and savanna vegetation of the Okavango Delta comprises a much wider suite of plant communities than the -dominated and -dominated classifications often used. This classification provided a more detailed understanding of this vegetation and essential background information for monitoring, management and research.


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