Medians of transpiration (E), stomatal conductance (gs), net photosynthesis (Amax), and water-use efficiency (wue), and their standard deviations during periods of dry air (VPD > 1.0 kPa). Significant differences (P < 0.05) between the species are indicated by different letters. n = number of measurements.
| Species | n | E [mmol m−2s−1] | gs [mmol m−2s−1] | Amax [μmol m−2s−1] | wue [μmol mmol−1] |
|---|---|---|---|---|---|
| A. platanoides | 27 | 0.60 ± 0.29 a | 16.6 ± 11.0 a | 1.41 ± 1.25 a | 2.53 ± 1.26 b |
| A. pseudoplatanus | 19 | 1.15 ± 0.46 b | 32.6 ± 15.2 ab | 2.97 ± 1.49 ac | 2.59 ± 0.89 b |
| P. × hispanica | 13 | 1.37 ± 0.42 b | 50.7 ± 14.8 b | 5.66 ± 1.28 b | 3.61 ± 1.16 a |
| Q. rubra | 8 | 1.18 ± 0.29 b | 34.1 ± 10.7 b | 4.29 ± 0.85 bc | 3.56 ± 0.78 a |
| T. platyphyllos | 24 | 1.33 ± 0.37 b | 37.3 ± 16.8 b | 3.85 ± 1.54 c | 2.97 ± 0.89 ab |