Vegetation change over 40 years in the Weenen/Muden area, KwaZulu-Natal: evidence from photo-panoramas

This is the authors' abstract. We don't add key points for this paper.

The utility of panoramic photographs for studying the extent and pattern of vegetation change, in particular of bush encroachment, was investigated by revisiting thirteen sites in the Weenen and Muden areas of KwaZulu-Natal that had been photographed in 1955. The ubiquitous feature of all sites was the marked increase in woody cover, from a mean of 21% woody cover for all topographic units (plains, hill slopes, river bank and river terrace) in 1955, to 59% woody cover in 1998. Although sample sizes were small, the increase in woody cover was greater on hill slopes (45% mean increase in woody cover) than on the plains (26%), and on north-facing slopes (56%) rather than on south-facing slopes (32%). The increase in woody plant cover was accompanied by a change in composition from open or mixed woodland, to one dominated by Acacia species, in particular by A. tortilis at lower altitudes and by A. karroo at higher altitudes. In some cases, scrub Acacia individuals were already evident in the photographs in 19...