Table 2.
Mean values and their standard errors (in parentheses) for air temperature (Ta), VPD and PAR during the treatment phase and during the measurements of gs and ψ in Q. robur
| Time | Plant variable | Ta (°C) | VPD (kPa) | PAR (μmol m−2 s−1) |
|---|---|---|---|---|
| Treatment period | ||||
| Entire day | 22·8 (0·1) | 1·30 (0·017) | 359·3 (29·9) | |
| Morning | 20·7 (0·1) | 0·90 (0·019) | 285·2 (39·1) | |
| Midday | 24·7 (0·2) | 1·67 (0·028) | 619·6 (50·6) | |
| Day 35 | ||||
| Morning | gs | 20·7 (1·2) | 0·81 (0·211) | 237·8 (62·1) |
| Midday | gs | 23·0 (0·5) | 1·31 (0·097) | 432·2 (109·5) |
| Day 49, midday | gs | 25·6 (0·4) | 1·88 (0·094) | 511·1 (155·9) |
| Day 65, midday | gs | 22·6 (0·8) | 1·61 (0·108) | 868·9 (159·2) |
| Day 92, midday | ψmd | 21·8 (0·3) | 0·97 (0·047) | 145·8 (12·9) |
| Day 93, predawn | ψpd | 17·9 (0·1) | 0·19 (0·004) | 0 |