D.M. ORR1, C.J. PATON2 and S. McINTYRE3
1Queensland Department of Primary Industries, Tropical Beef Centre, Rockhampton, and
2Brian Pastures Research Station, Gayndah, Queensland, Australia
3Division of Tropical Crops and Pastures, CSIRO, Brisbane, Queensland, Australia
A brief history and a state and transition model are described for the southern black speargrass zone.
The model proposes 4 states based on the herbaceous layer and timber composition. Transitions between these states are presented together with those factors driving the changes. The probabilities of achieving these transitions are presented along with a number of research needs required to further understand the proposed model.