Abstract

VAN DER MERWE, Helga; VAN ROOYEN, Margaretha W.  and  VAN ROOYEN, Noel. Vegetation of the Hantam-Tanqua-Roggeveld subregion, South Africa part 2: succulent karoo biome related vegetation. Koedoe [online]. 2008, vol.50, n.1, pp.160-183. ISSN 2071-0771.

The Hantam-Tanqua-Roggeveld subregion lies within the Succulent Karoo Hotspot that stretches along the western side of the Republic of South Africa and Namibia. This project, carried out to document the botanical diversity in the Hantam-Tanqua-Roggeveld subregion, was part of a project identified as a priority during the SKEP (Succulent Karoo Ecosystem Programme) initiative in this Hotspot. Botanical surveys were conducted in an area covering over three million hectares. Satellite images of the area and topocadastral, land type and geology maps were used to stratify the area into relatively homogeneous units. An analysis of the floristic data of 390 sample plots identified two major floristic units, i.e. the Fynbos Biome related vegetation and the Succulent Karoo Biome related vegetation. A description of the vegetation related to the Succulent Karoo Biome is presented in this article. Seven associations, 16 subassociations and several mosaic vegetation units, consisting of more than one vegetation unit, were identified and mapped. Various threats to the vegetation in the region were identified during the survey and are briefly discussed.

Keywords : Hantam; phytosociology; Roggeveld; Succulent Karoo; Tanqua Karoo; vegetation map; Western Mountain Karoo.

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