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Table III
Analyses of variance of Visual and Digital Crown Transparency mean values per poplar stand (N = 32) calculated with 265 trees data to test the effect of site quality, stand age and understorey management.
| N = 32 | Crown Transparency | ||||
|---|---|---|---|---|---|
| Visual | Digital | ||||
| Source | d .f . | F | Pr > F | F | Pr > F |
| Quality | 1 | 75.1 | < 0.01 | 25.7 | < 0.01 |
| Management | 1 | 7.2 | 0.01 | 0.3 | 0.61 |
| Age | 1 | 43.4 | < 0.01 | 7.4 | 0.01 |
| Quality × Management | 1 | 16.5 | < 0.01 | 4.9 | 0.04 |
| Quality × Age | 1 | 33.9 | < 0.01 | 11.9 | < 0.01 |
| Management × Age | 1 | < 0.1 | 0.87 | 0.9 | 0.3 |
| Quality × Management × Age | 1 | 3.6 | 0.07 | 1.3 | 0.3 |