Table 2 Key for assigning stand-level crown post-fire index (PFI) based on distributions of trees per acre (tally trees weighted by inverse of plot size) by crown status
Post-fire characteristics of the condition | Crown PFI class | ||
|---|---|---|---|
1: | Residual green (unburned) crowns present—“Alive” superclass | ||
1a | All trees that were live immediately pre-fire have ≥ 70% residual green (unburned) crown | Green | |
2b | At least half of trees have at least 30% of their crown length green (unburned), and none of their crowns contain black (consumed), though some are brown (scorched) | Mixed green | |
3c | Some (potentially less than half) of the trees contain some green (unburned) in their crowns, some contain brown (scorched), and some may contain black (consumed) | Mixed brown | |
2: | Residual green (unburned) crowns absent—“Dead” superclass | ||
2a | All trees have at least 90% of their crown length brown (scorched) | Brown | |
2b | There is a mixture of trees with brown (scorched) crown, both brown and black (consumed) crown and only black crowns | Transition | |
2c | All trees have at least 90% of their crown length black (burned) or consumed | Black | |