EXOTIC WOODY WEEDS Use of simulation models to predict future ...

Figure 3.5 CLIMEX Temperature Index (TI) for prickly acacia in Australia. A, current climate; B, 2 °C
increase in global temperature.
Figure 3.6 CLIMEX Cold Stress (CS) for prickly acacia in Australia. A, current climate; B, 2 °C increase
in global temperature.
Figure 3.7 CLIMEX Thermal Accumulation (accumulated degree-days, PDD). A, current climate; B, 2
°C increase in global temperature
Dry stress is increased by reductions in precipitation (Figure 3.9, b) compared with current conditions.
As with the moisture index and growth index, moderate increases in water use efficiency can
compensate for the reduction in precipitation (Figure 3.9, c). Any increase in precipitation or increase
in water use efficiency reduces the area in which prickly acacia would suffer even moderate dry stress.
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