Structure and association in the Mulga (Acacia aneura) lands of south-western Queensland

Abstract

Results of a detailed botanical survey in two mulga (Acacia aneura) areas of semiarid south-western Queensland are presented. Two 20 mile belt transects permanently identified for future relocation were used to record woody vegetation. The results for each of the study areas are interpreted by means of association analysis. Several site groups were recognized, in which increasing elevation from the flats to the ridges seems to be the main factor consistent with community changes.

The density of seedling and young mulga is considered inadequate for future drought reserves at one site. No large species groups exist on either site, and both areas represent small mosaics. It is suggested that microtopography is an important determinant of species distribution in the sites studied.