Table 2 Calculation of the departure index and ecosystem condition class based on the disparity between reference and current conditions of ponderosa pine bunchgrass forests on the Kaibab National Forest.
Ponderosa pine-Bunchgrass model state | Historic | Current | Calculation | |
|---|---|---|---|---|
Name | Description | Mean (%) | Mean (%) | Lesser of reference and current condition (%) |
A, J | Grass seedling sapling COMBINED WITH uncharacteristic grassland | 0.0 | 5.5 | 0.0 |
F | Seedling/sapling, >10 % tree cover | 0.0 | 1.7 | 0.0 |
B | Ponderosa pine young forest, <3 0% cover | 0.0 | 3.7 | 0.0 |
C | Ponderosa pine mid-age forest, <30 % cover | 0.1 | 14.7 | 0.1 |
D | Ponderosa pine, <160 years forest with regeneration, <30 % cover | 0.8 | 4.7 | 0.8 |
E | Ponderosa pine, 160 years plus with regeneration, <30 % cover | 99.1 | 1.2 | 1.2 |
G | Ponderosa pine young forest, >30 % cover | – | 8.6 | 0.0 |
H | Ponderosa pine mid-age forest, >30 % cover | – | 51.1 | 0.0 |
I | Ponderosa pine mature and old forest with regeneration, >30 % cover | – | 9.0 | 0.0 |
Sum ≥ | 2.0 | |||
Departure index = 100 % − Sum = | 98.0 | |||
Ecosystem condition class (0–33 = 1; 34–65 = 2; >66 = 3) = “3” | ||||