Table 3 Correlation coefficients between physical environmental factors and photosynthetic parameters of large old Z. serrata in each season.
Season | Parameters | Mean separation distance from the road | Depth of soil covering | Impervious surface ratio | Growth space ratio |
|---|---|---|---|---|---|
May (spring) | Amax | 0.42 | − 0.28 | − 0.23 | 0.49* |
E | 0.28 | − 0.22 | − 0.15 | 0.40 | |
gs | 0.35 | − 0.26 | − 0.20 | 0.47* | |
WUE | 0.31 | − 0.04 | 0.02 | − 0.01 | |
July (summer) | Amax | 0.18 | − 0.45* | − 0.51* | 0.46* |
E | 0.26 | − 0.52** | − 0.50* | 0.41* | |
gs | 0.24 | − 0.52** | − 0.51* | 0.39 | |
WUE | − 0.03 | − 0.10 | − 0.22 | 0.34 | |
September (fall) | Amax | − 0.15 | 0.09 | 0.17 | 0.08 |
E | − 0.08 | − 0.03 | − 0.03 | 0.06 | |
gs | − 0.09 | − 0.03 | − 0.01 | 0.05 | |
WUE | − 0.18 | 0.20 | 0.34 | − 0.07 |
