the richtersveld cultural and botanical landscape - SAHRA

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Richtersveld Cultural and Botanical Landscape World Heritage Site Nomination 29 Figure 3: Richtersveld Community Conservancy Vegetation Units: DESERT BIOME (East Gariep Centre) Lower Gariep Alluvial Vegetation 75406.5520 total ha 1169.6731 ha in Richtersveld Community Conservancy = 1.55% The Lower Gariep Alluvial Vegetation unit is found in a narrow strip along the Orange River from just east of Alexander Bay to the Boegoeberg Dam in the Northern Cape. A very small percentage of this unit is found in the Richtersveld Community Conservancy and consists of alluvial sandy floodplains next to the
Richtersveld Cultural and Botanical Landscape World Heritage Site Nomination 30 Orange River from the inflow of the Van Zyls River to Modderdrif-Suid. Mainly syenites and granites of the Richtersveld Suite are found here. Hot and dry conditions both in winter and summer are typical for the low altitudes along the Orange River with winter and summer rainfall, but predominantly in the summer rainfall. Annual rainfall is between 40 and 60 mm and the temperature in the summer is often between 40 °C and 50 °C. The vegetation is a gallery forest consisting mainly of trees like Tamarix usneoides, Rhus pendulina, Ziziphus micronata, Euclea pseudebenus, Acacia karoo and the exotic invader Prosopis glandulosa, as well as shrubs like Tetragonia schenckii in the temporarily flooded clay, loam or sandy terraces and pans. The trees are often infested with Viscum capensis and Tapinanthes oleifolius. Where there has been disturbance Epaltes gariepina, Nicotiana glauca (exotic invader), Frankenia pulverulenta, Coronopus integrifolius, Gnaphalium confine, Cyperus laevigatus and Argemone ochroleuca (exotic invader) are found. Other indicators of disturbance along the river are patches of Cynodon dactylon and Phragmites australis. In the still waters and shallow parts of the river, the reed Gomphostigma virgatum is found. Helskloof Canyon Desert 826.1197 total ha 653.6981 ha in Richtersveld Community Conservancy = 79.13% A small north-south valley where the lower reaches of the Groen River run into the Orange River between the Nababiepsberge in the east and the Rooiberge in the west. Altitudes vary between 160 to 300 m. Rock formations are mainly quartzite of the Kuibis Subgroup (Nama Group) with fringes of the area occurring on the metavolcanics and metasediments of the De Hoop Subgroup (Orange River Group). Shale, quartzite and limestone of the Schwarzrand Subgroup (Nama Group) are also present. The soils are alluvial sediment with colluvial material in places.
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the richtersveld cultural and botanical landscape - SAHRA

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