In this study we developed potential ‘best’ and ‘worst’ case climate change impact distribution models for future cropping and grazing using species distribution modelling software. MaxEnt predicts the probability that an area will be suitable for agricultural production based on changes in the climate variables most appropriate for each commodity. We chose the most appropriate climatic variables based on consultations with farmers, industry, NRM representatives and published literature.
We considered two Global Climate Models (GCM) under the current (baseline) climate and the A1FI emission scenario for 2025 and 2035 representing: 1) a ‘worst’ warmer and drier future (CSIRO Mk3.5) and 2) a ‘best’ cooler and wetter future (CSIRO MIROC-M). This study found that Agriculture in the Fitzroy Basin will be impacted by climate change
Cropping suitability is predicted to shift and contract from the west to the east. Cropping will be less affected under the cooler-wetter GCM.
Grazing suitability is predicted to shift and contract south and east.
Enterprises in the west are likely to experience stronger climate change impacts.
Rainfall (May-October) was the most important predictor of cropping.
Average annual temperature was the most important predictor for grazing.
Understanding the spatial changes to agriculture under future climates can inform land management decisions at various scales.