Table 2.
Effects of different potassium supplies on net photosynthetic rate (Pn), intercellular CO2 concentration (Ci), transpiration rate (Tr) and stomatal conductance (Cond) in the leaves of H. cordata.
| K1 | K2 | K3 | K4 | K5 | |
|---|---|---|---|---|---|
| Pn (μmol CO2 m−2 s−1) | 1.92 ± 0.14 (b) | 9.52 ± 0.72 (a) | 0.37 ± 0.06 (c) | 1.45 ± 0.39 (b) | 2.17 ± 0.40 (b) |
| Ci (μmol CO2 mol−1) | 433.98 ± 2.05 (a) | 383.87 ± 2.83 (b) | 438.74 ± 2.54 (a) | 428.73 ± 5.82 (a) | 429.20 ± 4.38 (a) |
| Tr (mmol H2O m−2 s−1) | 6.33 ± 1.06 (a) | 2.42 ± 0.26 (b) | 2.68 ± 0.35 (b) | 2.30 ± 0.11 (b) | 3.37 ± 0.68 (b) |
| Cond (mol H2O m−2 s−1) | 0.57 ± 0.03 (a) | 0.36 ± 0.04 (b) | 0.39 ± 0.03 (b) | 0.36 ± 0.10 (b) | 0.42 ± 0.08 (b) |
Note: Each value is means ± SE (n = 3). Values followed by the different letter in the same lines are significantly different according to Duncan's multiple range test (P < 0.05). K1, K2, K3, K4 and K5 indicate 0, 1.28, 2.56, 5.13 and 10.26 mM K, respectively.