Thesis (MScConsEcol (Conservation Ecology and Entomology))--University of Stellenbosch, 2005. / The veld condition in the Little Karoo is in various states of degradation and grazing
by domestic livestock is considered as the major anthropogenic force that changed
the landscape. This region with its extremely rich plant species diversity and
endemics, has supported small livestock for at least 2 000 years, and since
colonization (250 years ago) been intensively used for the production of a variety of
livestock. Ostrich production developed as the major source of income for this
region.
The first part of this study investigates the current veld management practices
employed by livestock farmers in the Little Karoo region. Recommended veld
management practices considered in this study are grazing rotation, moderate stocking
rate control, moderate veld utilisation, separation of ecotopes, veld rehabilitation,
controlling declared weeds and alien vegetation and regular assessment of veld
condition. One hundred randomly selected farmers were personally interviewed by
means of a structured questionnaire. Questions were grouped into the following
categories: (a) demography of farmers, (b) ostrich farming, (c) perceptions and
knowledge of farmers on farming practices, (d) grazing rotation, (e) stocking rate, (f)
veld utilisation and veld assessment, (g) separation of ecotopes, (h) veld
rehabilitation, (i) control of alien vegetation and (j) farmers’ knowledge on legislation.
This was used to obtain information on the Little Karoo farming community, sizes of
farms and camps, types of farming enterprises and on adoption of recommended veld
management practices in the region. The main findings from this section are that
relatively small farming units with few camps, poor separation of ecotopes and a low
estimated grazing capacity, limit extensive livestock farming within the region.
Perceptions of farmers on veld condition, grazing rotation, stocking rate, separation of
ecotopes are fairly optimistic. As a result grazing capacities are overestimated and
overstocking occurs within this region. The current stocking rate in ostrich camps
(67.7% overstocked) and mammalian livestock camps (55.1% overstocked) is
evidence that farmers overstock to compensate for these limiting factors in order to
make a living from the land. The majority of farmers are well aware of the Articles in
the Conservation of Agricultural Resources Act of 1983, which are applicable to veld management. Only more that 50% comply with this legislation by rehabilitating veld
and 80% of them control invasive alien species on their farm.
In the second part, veld assessments were done in randomly selected veld camps,
using the multi-criterion, semi-subjective Quick Rangeland Health Assessment
(QRHA) Method. Veld condition was significantly poorer closer to water or feeding
points due to the piosphere effect caused by livestock. Veld condition in the Little
Karoo can be related to altitude, vegetation types and land use. Therefore, the lowlying
Little Succulent Karoo vegetation type is in a poorer condition compared to
Spekboom Succulent Thicket and South and South-west Coast Renosterveld. Ostrich
production on plains in the Little Succulent Karoo vegetation type is the main cause
for the degradation of this vegetation type. It would seem as if historically high
stocking rates cannot be ignored in explaining the current veld condition. A positive
correlation between veld condition and the diversity of plant species (species density)
were found, which highlights the importance of good veld management practices in
sustainable agriculture.
The third part tested whether all indicators in the QRHA method are equally sensitive
and whether there is a positive correlation between the QRHA method and the
Grazing Index Method. A significant positive linear correlation was found between
the two methods. Cover was the least sensitive indicator of rangeland condition, and
livestock induced disturbances (which include the indicators grazing intensity,
disturbance indicators, soil health and species richness) were the most sensitive for
Karoo veld assessment. A major benefit of the QRHA method is heuristic; therefore
this method may have value in agricultural extension work.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/1999 |
| Date | 03 1900 |
| Creators | Cupido, Clement F. |
| Contributors | Milton, S. J., Visser, N., University of Stellenbosch. Faculty of Agrisciences. Dept. of Conservation Ecology and Entomology. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Stellenbosch |
Page generated in 0.0023 seconds