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Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa
Dissertation (MSc)--University of Pretoria, 1998.
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University of Pretoria
2021
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| _version_ | 1867613567030657024 |
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| access_status_str | Open Access |
| author2 | Van Wyk, Abraham Erasmus (Braam) |
| author_browse | Van Wyk, Abraham Erasmus (Braam) |
| author_facet | Van Wyk, Abraham Erasmus (Braam) |
| collection | Thesis |
| dc_rights_str_mv | © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 1998. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/82498 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:38:11.690Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/82498 Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa Van Wyk, Abraham Erasmus (Braam) Bredenkamp, George J. Siebert, Stefan John UCTD Sekhukhuneland chrome geology ultramafic endemism phytodiversity biodiversity savannah phytogeography phytochorion Centre of Endemism Dissertation (MSc)--University of Pretoria, 1998. Sekhukhuneland is an area of diverse geology and rich phytodiversity. This region harbours the world's largest reserves of chromium and platinum ore. A literature review of heavy metal soils is presented as introduction and motivation for this dissertation. Special attention was given to the effects of chromium on plants, due to its abundance in the Sekhukhuneland study area. Floristic elements of the Sekhukhuneland study area were determined by means of field work, herbarium studies and literature surveys. Approximately 50 endemic and 70 near-endemic taxa were identified for this region. Families such as Euphorbiaceae, Fabaceae, Liliaceae and Vitaceae proved the most prolific in endemic taxa. Distribution ranges for each of the floristic elements were mapped and analysed with a Geographical Information System. Plant distributions showed distinct floristic patterns within Sekhukhuneland, and links with other mountainous regions of the Northern Provinces of South Africa. Percentage surface cover of all the various geological substrates (predominantly Rustenburg Layered Suite and Transvaal Sequence) were calculated for each quarter degree grid in the study area. A correlation was found between the region's percentage endemism and percentage surface cover of ultramafic substrates. The ultramafic substrates, norite, anorthosite and pyroxenite, showed a significant positive correlation with percentage endemism. The high number of endemics and the endemic-ultramafic correlation in certain quarter degree grids, enabled the identification of focal areas of endemism in the study area. These focal areas of endemism support the status of Sekhukhuneland as an important Centre of Endemism. Plant Science MSc Unrestricted 2021-11-02T10:19:45Z 2021-11-02T10:19:45Z 2021 1998 Dissertation * http://hdl.handle.net/2263/82498 © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Sekhukhuneland chrome geology ultramafic endemism phytodiversity biodiversity savannah phytogeography phytochorion Centre of Endemism Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa |
| title | Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa |
| title_full | Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa |
| title_fullStr | Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa |
| title_full_unstemmed | Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa |
| title_short | Ultramafic substrates and floristic patterns in Sekhukhuneland, South Africa |
| title_sort | ultramafic substrates and floristic patterns in sekhukhuneland south africa |
| topic | UCTD Sekhukhuneland chrome geology ultramafic endemism phytodiversity biodiversity savannah phytogeography phytochorion Centre of Endemism |
| url | http://hdl.handle.net/2263/82498 |