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University of KwaZulu-Natal (1973)

Automatic classification and ecological profiles of South-Western Transvaal Highveld grassland

Morris, Jeffrey William.

Titre : Automatic classification and ecological profiles of South-Western Transvaal Highveld grassland.

Auteur : Morris, Jeffrey William.

Université de soutenance : University of KwaZulu-Natal

Grade : Doctor of Philosophy 1973

Résumé partiel
A quantitative semi-detailed plant ecological study of the o 0 0 60 2 area between 25 54’ and 26 22’ E and 26 00’ and 2 0’ S, situated around the town of Lichtenburg in the South-western Transvaal, South Africa, is reported. Mean annual temperature of the study area is 17 °c and annual rainfall is about 600 mm. A basic difference is recognised between the Bankenveld Land System and the CT Grassland Land System. The former is underlain by dolomite with lithosolic soils, Bankenveld vegetation and cattle ranohing as the chief land-use, whereas the latter is underlain by granite 7 Ventersdorp lavas, Dwyka tillite and surface limestone with Shorrocks, Mangano and Lichtenburg series soils, Cymbopogon-Themeda Veld vegetation and extensive cultivation of maize as the chief land-use. One hundred and ten 16 m 2 quadrats were placed within each Land System by means of a stratified-random strategy. Of the 247 species encountered, nearly 100 occurred in less than six quadrats. Themeda triandra, Aristida congesta, Elionurus argenteus, Anthospermum rigidum and Justicia anagaloides were common throughout. Two association analyses (AANAL) were carried out and a total of 21 final groups were described and 11 groups were mapped at 1:50 000. In addition

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