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Table II
Analyses of variance of Visual Crown Transparency and Visual Crown Discoloration mean values per poplar stand (N = 32) calculated from 4 sub-plots (2695 tree data) or 1 subplot (757 tree data) to test the effect of site quality, stand age and understorey management.
| N = 32 | Visual Crown Transparency | Visual Crown Discoloration | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 4 sub-plots | 1 sub-plot | 4 sub-plots | 1 sub-plot | |||||||
| Source | d .f . | F | Pr > F | F | Pr > F | F | Pr > F | F | Pr > F | |
| Quality | 1 | 108.2 | < 0.01 | 73.4 | < 0.01 | 20.6 | < 0.01 | 21.9 | < 0.01 | |
| Management | 1 | 1.8 | 0.19 | 2.7 | 0.11 | 0.2 | 0.69 | 0.1 | 0.73 | |
| Age | 1 | 94.8 | < 0.01 | 50.2 | < 0.01 | 11.9 | < 0.01 | 11.5 | < 0.01 | |
| Quality × Management | 1 | 12.1 | < 0.01 | 7.2 | 0.01 | 0.7 | 0.41 | 1.2 | 0.28 | |
| Quality × Age | 1 | 46.2 | < 0.01 | 30.8 | < 0.01 | 10.9 | < 0.01 | 8.9 | < 0.01 | |
| Management × Age | 1 | < 0.1 | 0.99 | < 0.1 | 0.98 | < 0.1 | 0.87 | < 0.1 | 0.77 | |
| Quality × Management × Age | 1 | 0.3 | 0.62 | < 0.1 | 0.85 | 0.1 | 0.78 | 0.2 | 0.66 | |