| Acronyms | Definitions | Unit |
| ΔAn/ΔCi | Ratio of An variation to Ci variation with different PAR | - |
| A/Ci | Net photosynthesis rate vs. CO2 response curve | - |
| ACE | Apparent carboxylation efficiency | - |
| An | Net photosynthesis rate | µmol·m−2·s−1 |
| AQY | Apparent quantum yield | - |
| bp | Balsam poplar (Populus balsamifera L.) | - |
| Ca | Ambient CO2 concentration | µmol·mol−1 |
| CAU | Carbonic anhydrase activity | EU |
| CEi | Intrinsic carboxylation efficiency | - |
| Ci | Intercellular CO2 concentration | µmol·mol−1 |
|
| Intercellular CO2 In Intercellular CO2 compensation point | µmol·mol−1 |
| Ci/Ca | Intercellular (Ci) to ambient (Ca) CO2 concentration ratio | - |
| CV | Coefficient of variation | - |
| cw | Black cottonwood (Populus trichocarpa Torr. & Gray) | - |
| DSF | Regression line fitted from the intersections of Demand and Supply Functions under different PAR with a Ca | - |
| dsf | Slope of DSF (dsf = ΔAn/ΔCi) | - |
| gm | Mesophyll conductance | mol·m−2·s−1 |
| Jmax | Maximum photosynthetic electron transport rate | µmol·m−2·s−1 |
| LRC (or lrc) | Light response curve | - |
| lv | Vertical line of DSF | - |
| MP | Conventional average mid-point to estimate Rd and from Laisk dataset | - |
| PAR | Photosynthetically active radiation | µmol·m−2·s−1 |
| Rd | Daytime respiration | µmol·m−2·s−1 |
| SI | Slope-intercept method to estimate Rd and from Laisk dataset (Walker et al., 2016) | - |
| Vcmax | Maximum rate of RuBP carboxylation | µmol·m−2·s−1 |
| VL | Novel vertical line (lv) method to estimate Rd and from Laisk dataset | - |
| wb | White birch (Betula papyrifera Marsh.) | - |