Water status and gas exchange variables during a drought and recovery experiment conducted on potted seedlings of L. decidua (L) and P. sylvestris (P) under controlled conditions. Depicted are water potential (|$\psi $|), tree water deficit (TWD), soil water content (SWC), stomatal conductance (|${\textit g}_{\textit s}$|) and net photosynthesis (|$A_{\text{net}}$|). The values correspond to Figures 2 and 4 and indicate the mean |$\pm $| SE of the control treatment across the experiment, as well as treatment means |$\pm $| SE of the drought treatment at the end of the first and second drought phase (D1 and D2) and of the drought–lethal treatment at the end of the experiment. The last two columns correspond to the time re-watered trees required to fully recover to pre-stress levels after D1 and D2, respectively.
| Parameter . | Species . | Mean control . | End D1 . | End D2 . | End drought–lethal . | Recovery D1 (days) . | Recovery D2 (days) . |
|---|---|---|---|---|---|---|---|
| |$\psi $| [|$-\text{MPa}$|] | L | 1.1 |$\pm $| 0.02 | 1.2 |$\pm $| 0.1 | 3.0 |$\pm $| 0.2 | 7.0 |$\pm $| 0 | < 3 | < 1 |
| P | 0.6 |$\pm $| 0.02 | 1.0 |$\pm $| 0.1 | 2.7 |$\pm $| 0.2 | 6.5 |$\pm $| 0.5 | < 3 | < 1 | |
| TWD [|$\text{mm}$|] | L | 0.01 |$\pm $| 0.0002 | 0.3 |$\pm $| 0.03 | 1.3 |$\pm $| 0.1 | 1.8 |$\pm $| 0.1 | 0 | 8 |$\pm $| 1 |
| P | 0.04 |$\pm $| 0.0002 | 0.2 |$\pm $| 0.04 | 1.6 |$\pm $| 0.2 | 2.1 |$\pm $| 0.2 | 0 | 9 |$\pm $| 1 | |
| TWD [|$\%$|] | L | 0.1 |$\pm $| 0.001 | 2.7 |$\pm $| 0.2 | 12.5 |$\pm $| 0.6 | 16.4 |$\pm $| 0.4 | ||
| P | 0.2 |$\pm $| 0.001 | 1.3 |$\pm $| 0.2 | 10.5 |$\pm $| 1.0 | 14.3 |$\pm $| 0.8 | |||
| SWC [|$\%$|] | L | 33.6 |$\pm $| 0.3 | 18.9 |$\pm $| 1.8 | 2.8 |$\pm $| 0.6 | 0.1 |$\pm $| 0.1 | 0 | 0 |
| P | 33.5 |$\pm $| 0.2 | 17.8 |$\pm $| 1.6 | 1.9 |$\pm $| 0.7 | 0.2 |$\pm $| 0.2 | 0 | 0 | |
| |${\textit g}_{\textit s}$| [|$\frac{\text{mmol}}{\text{m}^{2}\, \text{s}}$|] | L | 104 |$\pm $| 7 | 12 |$\pm $| 1 | 3 |$\pm $| 0.4 | 3 |$\pm $| 2 | < 3 | 20 |$\pm $| 3 |
| P | 76 |$\pm $| 5 | 10 |$\pm $| 3 | 3 |$\pm $| 0.3 | 3 |$\pm $| 0.5 | < 3 | 10 |$\pm $| 3 | |
| |$A_{net}$| [|$\frac{\mu \text{mol}}{\text{m}^{2}\, \text{s}}$|] | L | 5.4 |$\pm $| 0.3 | 1.9 |$\pm $| 0.2 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.03 | < 3 | 12 |$\pm $| 3 |
| P | 6.0 |$\pm $| 0.3 | 1.3 |$\pm $| 0.3 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.05 | < 3 | 6 |$\pm $| 3 |
| Parameter . | Species . | Mean control . | End D1 . | End D2 . | End drought–lethal . | Recovery D1 (days) . | Recovery D2 (days) . |
|---|---|---|---|---|---|---|---|
| |$\psi $| [|$-\text{MPa}$|] | L | 1.1 |$\pm $| 0.02 | 1.2 |$\pm $| 0.1 | 3.0 |$\pm $| 0.2 | 7.0 |$\pm $| 0 | < 3 | < 1 |
| P | 0.6 |$\pm $| 0.02 | 1.0 |$\pm $| 0.1 | 2.7 |$\pm $| 0.2 | 6.5 |$\pm $| 0.5 | < 3 | < 1 | |
| TWD [|$\text{mm}$|] | L | 0.01 |$\pm $| 0.0002 | 0.3 |$\pm $| 0.03 | 1.3 |$\pm $| 0.1 | 1.8 |$\pm $| 0.1 | 0 | 8 |$\pm $| 1 |
| P | 0.04 |$\pm $| 0.0002 | 0.2 |$\pm $| 0.04 | 1.6 |$\pm $| 0.2 | 2.1 |$\pm $| 0.2 | 0 | 9 |$\pm $| 1 | |
| TWD [|$\%$|] | L | 0.1 |$\pm $| 0.001 | 2.7 |$\pm $| 0.2 | 12.5 |$\pm $| 0.6 | 16.4 |$\pm $| 0.4 | ||
| P | 0.2 |$\pm $| 0.001 | 1.3 |$\pm $| 0.2 | 10.5 |$\pm $| 1.0 | 14.3 |$\pm $| 0.8 | |||
| SWC [|$\%$|] | L | 33.6 |$\pm $| 0.3 | 18.9 |$\pm $| 1.8 | 2.8 |$\pm $| 0.6 | 0.1 |$\pm $| 0.1 | 0 | 0 |
| P | 33.5 |$\pm $| 0.2 | 17.8 |$\pm $| 1.6 | 1.9 |$\pm $| 0.7 | 0.2 |$\pm $| 0.2 | 0 | 0 | |
| |${\textit g}_{\textit s}$| [|$\frac{\text{mmol}}{\text{m}^{2}\, \text{s}}$|] | L | 104 |$\pm $| 7 | 12 |$\pm $| 1 | 3 |$\pm $| 0.4 | 3 |$\pm $| 2 | < 3 | 20 |$\pm $| 3 |
| P | 76 |$\pm $| 5 | 10 |$\pm $| 3 | 3 |$\pm $| 0.3 | 3 |$\pm $| 0.5 | < 3 | 10 |$\pm $| 3 | |
| |$A_{net}$| [|$\frac{\mu \text{mol}}{\text{m}^{2}\, \text{s}}$|] | L | 5.4 |$\pm $| 0.3 | 1.9 |$\pm $| 0.2 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.03 | < 3 | 12 |$\pm $| 3 |
| P | 6.0 |$\pm $| 0.3 | 1.3 |$\pm $| 0.3 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.05 | < 3 | 6 |$\pm $| 3 |
Water status and gas exchange variables during a drought and recovery experiment conducted on potted seedlings of L. decidua (L) and P. sylvestris (P) under controlled conditions. Depicted are water potential (|$\psi $|), tree water deficit (TWD), soil water content (SWC), stomatal conductance (|${\textit g}_{\textit s}$|) and net photosynthesis (|$A_{\text{net}}$|). The values correspond to Figures 2 and 4 and indicate the mean |$\pm $| SE of the control treatment across the experiment, as well as treatment means |$\pm $| SE of the drought treatment at the end of the first and second drought phase (D1 and D2) and of the drought–lethal treatment at the end of the experiment. The last two columns correspond to the time re-watered trees required to fully recover to pre-stress levels after D1 and D2, respectively.
| Parameter . | Species . | Mean control . | End D1 . | End D2 . | End drought–lethal . | Recovery D1 (days) . | Recovery D2 (days) . |
|---|---|---|---|---|---|---|---|
| |$\psi $| [|$-\text{MPa}$|] | L | 1.1 |$\pm $| 0.02 | 1.2 |$\pm $| 0.1 | 3.0 |$\pm $| 0.2 | 7.0 |$\pm $| 0 | < 3 | < 1 |
| P | 0.6 |$\pm $| 0.02 | 1.0 |$\pm $| 0.1 | 2.7 |$\pm $| 0.2 | 6.5 |$\pm $| 0.5 | < 3 | < 1 | |
| TWD [|$\text{mm}$|] | L | 0.01 |$\pm $| 0.0002 | 0.3 |$\pm $| 0.03 | 1.3 |$\pm $| 0.1 | 1.8 |$\pm $| 0.1 | 0 | 8 |$\pm $| 1 |
| P | 0.04 |$\pm $| 0.0002 | 0.2 |$\pm $| 0.04 | 1.6 |$\pm $| 0.2 | 2.1 |$\pm $| 0.2 | 0 | 9 |$\pm $| 1 | |
| TWD [|$\%$|] | L | 0.1 |$\pm $| 0.001 | 2.7 |$\pm $| 0.2 | 12.5 |$\pm $| 0.6 | 16.4 |$\pm $| 0.4 | ||
| P | 0.2 |$\pm $| 0.001 | 1.3 |$\pm $| 0.2 | 10.5 |$\pm $| 1.0 | 14.3 |$\pm $| 0.8 | |||
| SWC [|$\%$|] | L | 33.6 |$\pm $| 0.3 | 18.9 |$\pm $| 1.8 | 2.8 |$\pm $| 0.6 | 0.1 |$\pm $| 0.1 | 0 | 0 |
| P | 33.5 |$\pm $| 0.2 | 17.8 |$\pm $| 1.6 | 1.9 |$\pm $| 0.7 | 0.2 |$\pm $| 0.2 | 0 | 0 | |
| |${\textit g}_{\textit s}$| [|$\frac{\text{mmol}}{\text{m}^{2}\, \text{s}}$|] | L | 104 |$\pm $| 7 | 12 |$\pm $| 1 | 3 |$\pm $| 0.4 | 3 |$\pm $| 2 | < 3 | 20 |$\pm $| 3 |
| P | 76 |$\pm $| 5 | 10 |$\pm $| 3 | 3 |$\pm $| 0.3 | 3 |$\pm $| 0.5 | < 3 | 10 |$\pm $| 3 | |
| |$A_{net}$| [|$\frac{\mu \text{mol}}{\text{m}^{2}\, \text{s}}$|] | L | 5.4 |$\pm $| 0.3 | 1.9 |$\pm $| 0.2 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.03 | < 3 | 12 |$\pm $| 3 |
| P | 6.0 |$\pm $| 0.3 | 1.3 |$\pm $| 0.3 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.05 | < 3 | 6 |$\pm $| 3 |
| Parameter . | Species . | Mean control . | End D1 . | End D2 . | End drought–lethal . | Recovery D1 (days) . | Recovery D2 (days) . |
|---|---|---|---|---|---|---|---|
| |$\psi $| [|$-\text{MPa}$|] | L | 1.1 |$\pm $| 0.02 | 1.2 |$\pm $| 0.1 | 3.0 |$\pm $| 0.2 | 7.0 |$\pm $| 0 | < 3 | < 1 |
| P | 0.6 |$\pm $| 0.02 | 1.0 |$\pm $| 0.1 | 2.7 |$\pm $| 0.2 | 6.5 |$\pm $| 0.5 | < 3 | < 1 | |
| TWD [|$\text{mm}$|] | L | 0.01 |$\pm $| 0.0002 | 0.3 |$\pm $| 0.03 | 1.3 |$\pm $| 0.1 | 1.8 |$\pm $| 0.1 | 0 | 8 |$\pm $| 1 |
| P | 0.04 |$\pm $| 0.0002 | 0.2 |$\pm $| 0.04 | 1.6 |$\pm $| 0.2 | 2.1 |$\pm $| 0.2 | 0 | 9 |$\pm $| 1 | |
| TWD [|$\%$|] | L | 0.1 |$\pm $| 0.001 | 2.7 |$\pm $| 0.2 | 12.5 |$\pm $| 0.6 | 16.4 |$\pm $| 0.4 | ||
| P | 0.2 |$\pm $| 0.001 | 1.3 |$\pm $| 0.2 | 10.5 |$\pm $| 1.0 | 14.3 |$\pm $| 0.8 | |||
| SWC [|$\%$|] | L | 33.6 |$\pm $| 0.3 | 18.9 |$\pm $| 1.8 | 2.8 |$\pm $| 0.6 | 0.1 |$\pm $| 0.1 | 0 | 0 |
| P | 33.5 |$\pm $| 0.2 | 17.8 |$\pm $| 1.6 | 1.9 |$\pm $| 0.7 | 0.2 |$\pm $| 0.2 | 0 | 0 | |
| |${\textit g}_{\textit s}$| [|$\frac{\text{mmol}}{\text{m}^{2}\, \text{s}}$|] | L | 104 |$\pm $| 7 | 12 |$\pm $| 1 | 3 |$\pm $| 0.4 | 3 |$\pm $| 2 | < 3 | 20 |$\pm $| 3 |
| P | 76 |$\pm $| 5 | 10 |$\pm $| 3 | 3 |$\pm $| 0.3 | 3 |$\pm $| 0.5 | < 3 | 10 |$\pm $| 3 | |
| |$A_{net}$| [|$\frac{\mu \text{mol}}{\text{m}^{2}\, \text{s}}$|] | L | 5.4 |$\pm $| 0.3 | 1.9 |$\pm $| 0.2 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.03 | < 3 | 12 |$\pm $| 3 |
| P | 6.0 |$\pm $| 0.3 | 1.3 |$\pm $| 0.3 | 0.0 |$\pm $| 0.04 | -0.1 |$\pm $| 0.05 | < 3 | 6 |$\pm $| 3 |
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