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Fig. 1
Trend of climatic data during the days of experiment: Temperature (closed circles), vapor pressure deficit (VPD, open circles), and global radiation (RG) are shown. Error bars for each average value of temperature and VPD come from 3 measurements, taken at the hours of the day with highest radiation (11:30, 12:30, and 13:30). RG values refer to the interval 11:30–13:30
Fig. 2
Leaf area by species. Values marked with the same letter are not statistically different at p < 0.05, according to Duncan's multiple range test. Error bars were calculated from six measurements (replicates) for each average value
Fig. 3
ET/RG ratio versus substrate water tensionNote: See Fig. 2
Fig. 4
Relative stomatal conductance (gsrel) versus substrate water tensionNote: See Fig. 2
Fig. 5
Linear correlation between measured and calculated stomatal conductance; for each species, a single regression line, with slope and R2, is presented in the graph; the central dotted line represents the ideal 1 : 1 relationship between measured and calculated gs
Fig. 6
ΔT versus substrate water tension. Note: See Fig. 2
Substrate water tension (SWT) versus percentage of container capacity for the three investigated species