STATE AND TRANSITION MODELS FOR RANGELANDS .13. A STATE AND TRANSITION MODEL FOR THE MULGA ZONE OF SOUTH-WEST QUEENSLAND

We present a state and transition model for the mulga zone of south-we st Queensland describing different states involving shrub, tree, grass , forb, soil loss and seed reserves so that landusers can use the mode l to make responsible decisions about land management. Factors assisti ng transition between states, the time-frame for a high probability of the event to occur, and the relative degradation of each state are de scribed. Areas where information is lacking include the effect of kang aroos and feral goats, and frequency and severity of grazing pressure and fire on trees, shrubs and pasture. Information transfer of the mod el to landusers is another problem and we suggest using a poster model with colour prints depicting each state.