Abstract

VAN DER MERWE, Helga; VAN ROOYEN, Margaretha W.  and  VAN ROOYEN, Noel. Vegetation of the Hantam-Tanqua-Roggeveld subregion, South Africa. Part 1: fynbos biome related vegetation. Koedoe [online]. 2008, vol.50, n.1, pp.61-71. ISSN 2071-0771.

The Succulent Karoo Hotspot stretches along the western side of the Republic of South Africa and Namibia. A lack of botanical information on the Hantam-Tanqua-Roggeveld area of the Succulent Karoo Hotspot was identified during the SKEP (Succulent Karoo Ecosystem Plan) process. A grant from CEPF (Critical Ecosystem Partnership Fund) funded a study to produce a vegetation map of the area to serve as baseline for ecosystem management. Vegetation surveys were conducted over an area of more than three million hectares from August to October 2004. Two major floristic units were identified, namely the Fynbos Biome related (Mountain Renosterveld) and Succulent Karoo Biome related units. An analysis of the floristic data of the predominantly Mountain Renosterveld vegetation unit is presented in this paper. Three associations were identified, which were subdivided into nine subassociations, one of which contains four variants. The vegetation units are described in terms of their species composition and their relationships with the physical environment. A vegetation map is provided depicting the geographical distribution of the different vegetation types. The main threat to the vegetation of the region identified by the farming community was a lack of infrastructure.

Keywords : Mountain Renosterveld; phytosociology; Succulent Karoo; vegetation classification; vegetation map.

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