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Table III
Pearson’s correlation coefficient for all pre-drought and post-drought measured gas exchange, water-use, and water relations parameters against elevation and various indices of temperature and precipitation for the location of origin of seven western redcedar populations. One, two or three asterisks indicate significance at the 0.10, 0.05 and 0.01 level of probability. See Table I for more details about locations of populations and descriptors of the site of origin for the western redcedar populations.
| (MAP) Mean | (MSP) Mean | (SUMAVE) | ||||||
|---|---|---|---|---|---|---|---|---|
| annual | summer | (ADI) annual | (SDI) Summer | Average summer | ||||
| precipitation | precipitation | dryness | dryness | Continentality | temperature | |||
| Elevation (m) | (mm) | (mm) | index | index | (MTWM-MTCM) | (°C) | ||
| (A) Net CO2 assimilation (ţmol m−2 s−1) | ||||||||
| Well-watered seedlings | 0.44 | –0.51 | –0.59 | 0.23 | 0.32 | 0.62 | 0.15 | |
| Droughted seedlings | –0.13 | –0.51 | –0.52 | 0.30 | 0.57 | 0.39 | 0.34 | |
| Log linear slope of A to decreasing Ψpd | –0.15 | 0.13 | 0.09 | 0.12 | 0.02 | –0.21 | 0.19 | |
| (gwv) Stomatal conductance of water vapour (mmol m−2 s−1) | ||||||||
| Well-watered seedlings | 0.33 | –0.58 | –0.64 | 0.50 | 0.61 | 0.45 | 0.30 | |
| Droughted seedlings | –0.42 | –0.15 | –0.14 | 0.05 | 0.32 | –0.01 | 0.10 | |
| Log linear slope of gwv to decreasing Ψpd | 0.64 | –0.46 | –0.21 | 0.54 | 0.28 | 0.34 | 0.08 | |
| (WUEi) Intrinsic water-use efficiency | ||||||||
| Well-watered seedlings | 0.20 | 0.02 | –0.01 | –0.33 | –0.32 | 0.30 | –0.16 | |
| Droughted seedlings | 0.64 | –0.62 | –0.66 | 0.44 | 0.37 | 0.76** | 0.33 | |
| Log linear slope of WUEi to decreasing Ψpd | –0.36 | 0.46 | 0.48 | –0.25 | –0.34 | –0.48 | –0.08 | |
| (RWCtlp) Relative water content at turgor loss point (%) | ||||||||
| Before drought | 0.04 | –0.08 | –0.02 | –0.08 | -0.06 | -0.15 | 0.13 | |
| After drought | –0.57 | 0.90*** | 0.95*** | –0.72* | –0.77** | –0.87*** | –0.50 | |
| (Ψtlp) Osmotic potential at turgor loss point (–MPa) | ||||||||
| Before drought | –0.28 | –0.15 | –0.35 | 0.03 | 0.43 | 0.11 | 0.52 | |
| After drought | 0.70* | –0.66* | –0.32 | 0.53 | 0.29 | 0.72* | –0.29 | |
| (Ψsat) Osmotic potential at saturation (–MPa) | ||||||||
| Before drought | 0.30 | –0.33 | –0.20 | 0.25 | 0.12 | 0.42 | 0.10 | |
| After drought | 0.41 | –0.34 | 0.08 | 0.28 | 0.02 | 0.38 | –0.56 | |
| (εmax) Modulus of elasticity at saturation (MPa) | ||||||||
| Before drought | 0.02 | –0.08 | 0.01 | –0.07 | –0.09 | 0.20 | 0.02 | |
| After drought | –0.15 | 0.61 | 0.85** | –0.52 | –0.79** | –0.39 | –0.94*** | |
| (TFDcuticular) Cuticular transpiration (mg h−1gdw−1) | ||||||||
| Before drought | 0.03 | –0.03 | –0.23 | –0.12 | –0.05 | 0.24 | 0.29 | |
| After drought | –0.47 | 0.81** | 0.65 | –0.61 | –0.58 | –0.84** | –0.07 | |
| Number of significant correlations | 1 | 3 | 2 | 1 | 2 | 4 | 1 | |