Vegetation classification for the management of large mammalian herbivores: a case study at Mushingashi Conservancy, Central Province, Zambia

Abstract

The vegetation of Mushingashi Conservancy in central Zambia was classified and mapped to provide a template for wildlife management. Putative vegetation types were delineated using Landsat 8 imagery, then sampled with 73 plots for vegetation composition and structure, and topo-edaphic properties. Classification followed a four-stage
process. Valley dambo and floodplain grasslands were first separated as landscape units from wooded plots. Hierarchical cluster analysis was then used to identify 13 vegetation types based on woody composition and structure. Convex hull plots on a principal component analysis biplot successfully delineated the topo-edaphic environment and woody structure of each type. Linear discriminant analysis confirmed differences in topo-edaphic environment among types. The main environmental gradient was from vertic clays, supporting open Acacia woodland, to sandy soils, supporting miombo woodland, but other gradients were also important. Of a total of 193 woody species recorded, 25 occurred only on large termitaria. An influence of environmental gradients independent of plant-available moisture and nutrients is emphasised. Total woody cover decreased conspicuously on clay-rich soils with increased water availability. A functional vegetation classification of this nature is considered an essential first step towards the informed management of rangeland for large herbivores. Potential applications for management are discussed.