Table 3. The effects of different N supplies on steady-state photosynthesis under a low light level (A initial), maximum photosynthetic rate under flecks (A max–fleck), minimum photosynthetic rate under flecks (A min–fleck), steady-state stomatal conductance under a low light level (g s,initial), maximum stomatal conductance under flecks (g s,max–fleck), times to 50% and 90% of A max–fleck (T 50%A and T 90%A), times to 50% and 90% of g s,max–fleck (T 50%gs and T 90%gs), post-irradiance CO2 fixation, and CO2 burst.
| Parameters | High N | Low N |
|---|---|---|
| Ainitial (μmol m−2 s−1) | 5.99 ± 0.15 a | 4.99 ± 0.88 b |
| Amax–fleck (μmol m−2 s−1) | 28.64 ± 1.45 a | 17.51 ± 404 b |
| Amin–fleck (μmol m−2 s−1) | 4.08 ± 0.30 a | 3.46 ± 0.89 a |
| gs,initial (mol m−2 s−1) | 0.16 ± 0.02 a | 0.09 ± 0.04 b |
| gs,max (mol m−2 s−1) | 1.28 ± 0.20 a | 0.50 ± 0.16 b |
| T50%A (min) | 1.67 ± 0.21 a | 1.47 ± 0.44 a |
| T90%A (min) | 10.88 ± 2.02 b | 17.91 ± 2.79 a |
| T50%gs (min) | 2.56 ± 0.41 a | 2.20 ± 0.66 a |
| T90%gs (min) | 22.48 ± 15.51 a | 19.56 ± 3.69 a |
| Post-irradiance CO2 fixation (%) | 5.51 ± 0.20 a | 6.01 ± 1.55 a |
| Post-irradiance CO2 burst (%) | 0.17 ± 0.05 a | 0.54 ± 0.45 a |
Note: Data are presented as means ± SD with three replications; data followed by different letters are significant at the P < 0.05 level.