Tropical Grasslands (1992) Volume 26, 97–99

Resting from grazing to reverse changes in sown pasture composition: application of the 'state-and-transition' model

R.M. JONES

Division of Tropical Crops and Pastures, CSIRO, Brisbane, Australia.

Abstract

In coastal south-east Queensland, sown pastures, initially dominated by siratro (Macroptilium atropurpureum) and setaria (Setaria sphacelata), can be changed into blue couch (Digitaria didactyla) and carpet grass (Axonopus affinis) through sustained heavy grazing. The change is considered a transition between two states in the 'state-and-transition' model of range vegetation. Resting from grazing, a method of regaining the initial state, was progressively less effective during the transition period. Eventually resting was unable to cause reversion to the initial state. The advantages of the model in describing these changes are discussed.

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