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The simulated scenarios of WTD = 0.5 and 1 m had the highest transpiration, with totals of 376 and 926 mm for the A. capillaris and P. australis communities, respectively. The water stress Ta/Tp ratio of the A. capillaris and P. australis communities was equal to 1 for both cases (Table 5). This suggested that when WTD was within 1 m, soil moisture was sufficient to sustain plants using water at the potential rate and transpiration was completely controlled by atmospheric demand.

Table 5

Simulated cumulative transpiration and upward fluxes of groundwater across root zone bottom in the main growth stage (July–October) for different WTD scenarios

WTD (m)A. capillaris community
P. australis community
Ta (mm)G (mm)G/Ta (−)Ta/Tp (−)Ta (mm)G (mm)G/Ta (−)Ta/Tp (−)
0.5 376 213 0.57 1.00 926 715 0.77 1.00 
1.0 376 209 0.56 1.00 925 711 0.77 1.00 
1.5 328 135 0.44 0.87 782 554 0.71 0.84 
2.0 280 69 0.25 0.74 515 266 0.52 0.56 
2.5 261 34 0.13 0.69 407 150 0.37 0.44 
3.0 254 17 0.07 0.68 364 102 0.28 0.39 
WTD (m)A. capillaris community
P. australis community
Ta (mm)G (mm)G/Ta (−)Ta/Tp (−)Ta (mm)G (mm)G/Ta (−)Ta/Tp (−)
0.5 376 213 0.57 1.00 926 715 0.77 1.00 
1.0 376 209 0.56 1.00 925 711 0.77 1.00 
1.5 328 135 0.44 0.87 782 554 0.71 0.84 
2.0 280 69 0.25 0.74 515 266 0.52 0.56 
2.5 261 34 0.13 0.69 407 150 0.37 0.44 
3.0 254 17 0.07 0.68 364 102 0.28 0.39 

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