Net photosynthesis (A), transpiration (E), water use efficiency (WUE), stomatal conductance (Gs), substomatal CO2 concentration (Ci), and chlorophyll fluorescence values in Aesculus × carnea young trees under different cultivation techniques.z
Parameter | Year | Pine bark | Compost | Control | P |
---|---|---|---|---|---|
A (μmol/m−2/s−1) | 2005 | 6.75 | 6.91 | 6.95 | NS |
2006 | 8.43 | 8.85 | 8.53 | NS | |
E (mmol/m−2/s−1) | 2005 | 2.66 a | 2.81 a | 2.46 b | ** |
2006 | 1.76 | 1.96 | 1.78 | NS | |
WUE (A/E) | 2005 | 2.65 ab | 2.56 b | 2.93 a | * |
2006 | 5.60 | 5.04 | 5.11 | NS | |
Gs (mmol/m−2/s−1) | 2005 | 149.01 a | 148.11 a | 124.85 | ** |
2006 | 98.84 | 107.05 | 101.02 | NS | |
Ci (ppm) | 2005 | 178.06 | 171.75 | 160.58 | NS |
2006 | 181.95 | 190.00 | 192.26 | NS | |
Chlorophyll fluorescence (Fv/Fm) | 2005 | 0.75 | 0.74 | 0.73 | NS |
2006 | 0.75 | 0.74 | 0.74 | NS |
↵zData are reported as means and subjected to analysis of variance. Different letters within the same row indicate statistical differences at P ≤ 0.05 (*) or P ≤ 0.01 (**) using Duncan test.
NS = nonsignificant.