A baseline description of the soils and vegetation of Farm Klein Boesman, Khomas Region, Namibia
Keywords:Dordabis mountainveld, Kalahari Duneveld, Namibia, phytosociology, soil characterisation, soil and terrain mapping, southern Kalahari, vegetation
The Farm Klein Boesman, south of Dordabis in the Khomas Region of Central Namibia, is situated on the ecotone between the Central Highlands/Central Plateau and the southern Kalahari. Whereas a considerable amount of information is available for the Kalahari Duneveld in South Africa, little is known of the same ecosystem in Namibia, specifically the northern extent of this ecosystem. We stratified the farm according to visible terrain features identified on aerial images, aided by a Shuttle Radar Topography Mission (SRTM) digital terrain model. Based on these initial stratification units, 35 minipits and/or soil augerings were done to sample the typical soil units. From these, soil samples were analysed for soil chemical and physical properties. In addition, 158 relevÃ©s were compiled across all initial stratification units. These were classified with modified Two-Way Indicator Species Analysis (TWINSPAN) using a synusial approach. From the results we described and mapped twelve landform and ten soil units, as well as six vegetation associations, of which two were subdivided into two and three subassociations each. We compare these associations with related vegetation types described in the Khomas Hochland as well as in the Kalahari Gemsbok National Park (KGNP) in South Africa. Although several similarities to units described for the KGNP were identified, several discrepancies were also identified, necessitating a thorough revision of the vegetation descriptions for the greater southern Kalahari.
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