| An | Assimilation rate |
| Gs | Stomatal conductance |
| Ci | Internal CO2 concentration |
| WUE | Water-use efficiency |
| Vcmax | Maximum rate of Rubisco carboxylation |
| Jmax | Maximum rate of electron transport |
| LMA | A leaf mass per unit leaf area |
| Narea | A leaf nitrogen content per unit leaf area |
| NC | Nitrogen contents in carboxylation |
| NB | Nitrogen contents in bioenergetics |
| NL | Nitrogen contents in light harvesting components |
| Npsn | Nitrogen contents in photosynthetic apparatus |
| PNUE | Photosynthetic nitrogen use efficiency |
| Fv/Fm | The maximum quantum yield of PSII |
| NPQ | The non-photochemical quenching coefficient |
| φPSII | The effective quantum yield of PSII |
| ETR | The electron transport rate |
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