Structural Condition Class Descriptions
DecAID Structural Condition Classes are based on Structural Conditions from Chapter 3 in Wildlife-Habitat Relationships in Oregon and Washington (O'Neil et al. 2001). The exception is post-fire habitats which are not classified or described in O'Neil et al. 2001. Click on the links in the WHR Structural Conditions column below to see complete descriptions of the WHR Structural Conditions. To view diagrams of example stands in the DecAID Structural Condition Classes click on the links in that column below. Diagrams are from the Stand Visualization Simulator (SVS).
| DecAID Structural Condition Class | Definition - size class and tree stocking1 | WHR Structural Conditions |
|---|---|---|
| Post-fire | stand replacing fire; stocking and trees size variable; high snag densities | N/A |
| Open Canopy | tree stocking <10% or tree stocking >=10% and QMD 1-9 inches (2.5-24.9 cm) | 1 Grass/Forb Open |
| Open Canopy | tree stocking <10% or tree stocking >=10% and QMD 1-9 inches (2.5-24.9 cm) | 2 Grass/Forb Closed |
| Open Canopy | tree stocking <10% or tree stocking >=10% and QMD 1-9 inches (2.5-24.9 cm) | 3 Shrub/seedling Open |
| Open Canopy | tree stocking <10% or tree stocking >=10% and QMD 1-9 inches (2.5-24.9 cm) | 4 Shrub/seedling Closed |
| Open Canopy | tree stocking <10% or tree stocking >=10% and QMD 1-9 inches (2.5-24.9 cm) | 5 Sapling/Pole Open |
| Open Canopy | tree stocking <10% or tree stocking >=10% and QMD 1-9 inches (2.5-24.9 cm) | 6 Sapling/Pole Moderate |
| Open Canopy | tree stocking <10% or tree stocking >=10% and QMD 1-9 inches (2.5-24.9 cm) | 7 Sapling/Pole Closed |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 8 Small tree single story open |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 9 Small tree single story moderate |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 10 Small tree single story closed |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 11 Medium tree single story open |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 12 Medium tree single story moderate |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 13 Medium tree single story closed |
| Larger Trees | tree stocking >=10% and QMD >=20 inches (50.0 cm) | 14 Large tree single story open |
| Larger Trees | tree stocking >=10% and QMD >=20 inches (50.0 cm) | 15 Large tree single story moderate |
| Larger Trees | tree stocking >=10% and QMD >=20 inches (50.0 cm) | 16 Large tree single story closed |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 17 Small tree multi-story open |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 18 Small tree multi-story moderate |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 19 Small tree multi-story closed |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 20 Medium tree multi-story open |
| Small/mediumTrees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 21 Medium tree multi-story moderate |
| Small/medium Trees | tree stocking >=10% and QMD 10-19 inches (25.0-49.9 cm) | 22 Medium tree multi-story closed |
| Larger Trees | tree stocking >=10% and QMD >=20 inches (50.0 cm) | 23 Large tree multi-story open |
| Larger Trees | tree stocking >=10% and QMD >=20 inches (50.0 cm) | 24 Large tree multi-story moderate |
| Larger Trees | tree stocking >=10% and QMD >=20 inches (50.0 cm) | 25 Large tree multi-story closed |
| Larger Trees | tree stocking >=10% and QMD >=20 inches (50.0 cm) | 26 Giant tree multi-story |