Table 4.
Results of MANOVA by individual sites with N. gaeumannii. Because site is a crucial factor involved in most interactions, the MANOVA was re-run by site to clarify the effects from other factors. Tree age was another key factor in SNC severity index analysis and involved in many interactions. Canopy position contributed to foliage retention when considering the site effect.
| SNC Severity Index | Foliage retention | ||||||
|---|---|---|---|---|---|---|---|
| F-value | p-value | F-value | p-value | ||||
| CH1 | Tree age | 26.0 | 0.007 | ** | 0.8 | 0.413 | |
| Year | 6.0 | 0.070 | . | 0.4 | 0.567 | ||
| Tree age × Year | 0.8 | 0.413 | 2.0 | 0.229 | |||
| Canopy | 20.9 | 0.017 | * | 4.1 | 0.137 | ||
| Tree age × Canopy | 5.3 | 0.105 | 2.2 | 0.256 | |||
| Year × Canopy | 5.5 | 0.100 | . | 6.3 | 0.084 | . | |
| Tree age × Year × Canopy | 4.9 | 0.115 | 0.8 | 0.519 | |||
| KT1 | Tree age | 35.6 | 0.009 | ** | 0.4 | 0.596 | |
| Year | 45.9 | 0.007 | ** | 0.0 | 0.938 | ||
| Tree age × Year | 44.1 | 0.007 | ** | 2.0 | 0.252 | ||
| Canopy | 0.0 | 0.988 | 338.3 | 0.003 | ** | ||
| Tree age × Canopy | 0.1 | 0.948 | 46.4 | 0.021 | * | ||
| Year × Canopy | 0.2 | 0.864 | 1.8 | 0.361 | |||
| Tree age × Year × Canopy | 0.3 | 0.783 | 7.4 | 0.120 | |||
| WC1 | Tree age | 136.7 | < 0.001 | *** | 23.9 | 0.008 | ** |
| Year | 17.5 | 0.014 | * | 0.4 | 0.549 | ||
| Tree age × Year | 17.3 | 0.014 | * | 0.4 | 0.566 | ||
| Canopy | 14.6 | 0.028 | * | 9.3 | 0.052 | .* | |
| Tree age × Canopy | 15.0 | 0.027 | * | 0.9 | 0.498 | ||
| Year × Canopy | 3.7 | 0.154 | 0.0 | 0.996 | |||
| Tree age × Year × Canopy | 3.8 | 0.151 | 0.7 | 0.577 | |||
| MM1 | Tree age | 17.12 | 0.014 | ** | 1.8 | 0.251 | |
| Year | 284.6 | < 0.001 | *** | 0.9 | 0.392 | ||
| Tree age × Year | 258.5 | < 0.001 | *** | 12.9 | 0.023 | * | |
| Canopy | 4.8 | 0.117 | 257.3 | < 0.001 | *** | ||
| Tree age × Canopy | 3.9 | 0.148 | 5.3 | 0.105 | |||
| Year × Canopy | 1.4 | 0.379 | 1.5 | 0.349 | |||
| Tree age × Year × Canopy | 0.9 | 0.490 | 1.3 | 0.396 | |||
| FC1 | Tree age | 98.0 | 0.001 | *** | 0.0 | 0.942 | |
| Year | 0.4 | 0.565 | 4.4 | 0.105 | |||
| Tree age × Year | 0.4 | 0.585 | 2.0 | 0.227 | |||
| Canopy | 4.2 | 0.134 | 4.6 | 0.122 | |||
| Tree age × Canopy | 4.5 | 0.127 | 4.9 | 0.114 | |||
| Year × Canopy | 42.8 | 0.006 | ** | 0.3 | 0.766 | ||
| Tree age × Year × Canopy | 34.4 | 0.009 | ** | 0.8 | 0.528 | ||
| SG1 | Tree age | - | - | 0.2 | 0.700 | ||
| Year | - | - | 1.4 | 0.310 | |||
| Tree age × Year | - | - | 0.2 | 0.651 | |||
| Canopy | - | - | 1.5 | 0.358 | |||
| Tree age × Canopy | - | - | 0.0 | 0.980 | |||
| Year × Canopy | - | - | 0.2 | 0.869 | |||
| Tree age × Year × Canopy | - | - | 1.1 | 0.443 | |||
| TC1 | Tree age | - | - | 8.3 | 0.045 | * | |
| Year | - | - | 0.0 | 0.968 | |||
| Tree age × Year | - | - | 1.1 | 0.361 | |||
| Canopy | - | - | 14.6 | 0.029 | * | ||
| Tree age × Canopy | - | - | 13.4 | 0.032 | * | ||
| Year × Canopy | - | - | 0.0 | 0.972 | |||
| Tree age × Year × Canopy | - | - | 0.4 | 0.687 | |||
1
The abbreviation of study sites is Cascade Head (CH), Woods Creek (WC), and Klickitat Mountain (KT), Moose Mountain (MM), Falls Creek (FC), Soapgrass Mountain (SG), and Toad Creek (TC).