Original Research

Kalahari vegetation: veld condition trends and ecological status of species

N. Van Rooyen, G.J. Bredenkamp, G.K. Theron
Koedoe | Vol 34, No 1 | a415 | DOI: https://doi.org/10.4102/koedoe.v34i1.415 | © 1991 N. Van Rooyen, G.J. Bredenkamp, G.K. Theron | This work is licensed under CC Attribution 4.0
Submitted: 23 September 1991 | Published: 23 September 1991

About the author(s)

N. Van Rooyen, University of Pretoria, South Africa
G.J. Bredenkamp, University of Pretoria, South Africa
G.K. Theron, University of Pretoria, South Africa

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Abstract

Grazing intensity gradients were determined in the duneveld, river terrace and river bed habitats of the Kalahari Gemsbok National Park. Under increased grazing, a species composition characterised mostly by annual forbs and grasses results. In all three habitats the relatively heavily grazed areas were closest to the watering points, although this was less evident in the river terrace and river bed habitats. Monitoring degradation at a watering point over the long term, produced results similar to those observed from a single sampling period. The identification of grazing gradients within homogeneous habitats, is a prerequisite for the classification of plant species into different categories. The allocation of a species to a category is based on the changes in frequency along this grazing gradient and this approach is more acceptable than the classification of species commonly used. The use of terminology such as Decreasers and Increasers is discussed.

Keywords

Decreaser, grazing gradients, Increaser, Kalahari, ordination, rainfall, veld condition.

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Crossref Citations

1. Ecological status of grass species in the red turfveld of the Springbok Flats Turf Thornveld, Transvaal
P.J. Nel, G.J. Bredenkamp, N. van Rooyen
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doi: 10.1016/S0254-6299(16)30772-4