Appendix B. Summary of variables used in logistic regression models.
Weather (fuel moisture) |
|||
Index |
Classification |
Range (mean) |
|
FFMCDAYS |
number of days per voxel above threshold FFMC |
0-44 (16) |
|
DMCDAYS |
number of days per voxel above threshold DMC |
0-56 (14) |
|
SSR |
regional annual seasonal severity rating of fire weather |
0.8-1.4 (1.06) |
|
LDAYS |
number of days with lightning per voxel |
0-29 (3) |
|
LCOUNT |
sum of lightning strikes per voxel |
0-332 (37) |
|
FFMCJWL |
joint FFMC – lightning index |
0-12 (2) |
|
DMCJWL |
joint DMC – lightning index |
0-13 (2) |
|
ISIJWL |
joint ISI – lightning index |
0-15 (3) |
|
wFFMCJWL |
weighted FFMCJWL |
0-10.4 (1.4) |
|
wDMCJWL |
weighted DMCJWL |
0-12 (1.5) |
|
Geography |
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ELEV |
Elevation at the centroid of each landscape |
227-1019 m |
|
NORTH |
UTM at centroid of landscape |
6 100 565 – 6 428 588 |
|
Forest composition |
Landscape |
Regional |
|
Stand cover type |
Forest classification |
Range (median)§ |
Proportion†(found)‡ |
deciduous (AL) |
deciduous canopy dominance and less than 25% canopy closure, up to 50% conifer by volume |
0-1500 (27) |
0.01 (71%) |
deciduous (AH) |
deciduous canopy dominance and greater than 25% canopy closure, up to 50% conifer by volume |
0-8400 (2200) |
0.27 (99%) |
white spruce (SW) |
white spruce canopy dominance and up to 50% other species by volume |
0-3600 (360) |
0.06 (90%) |
jack pine (PJ) |
jack pine canopy dominance |
0-6300 (460) |
0.09 (95%) |
black spruce (SB) |
black spruce canopy dominance |
0-6400 (540) |
0.11 (95%) |
open (O) |
low density scrub and all wetland types (not including water bodies) |
100-9200 (3300) |
0.38 (100%) |
burned (B) |
burned at the time of inventory |
0-9300 (0) |
0.06 (35%) |
various|| |
burned or logged after inventory with unknown pre-disturbance cover type, cut at time of inventory, or unknown date of disturbance |
0-7300 (0) |
0.02 |
†Mean values from all 946 sample landscapes were used in regional proportions of forest composition since some values changed slightly over the study period as a result of disturbances.
‡ The percentage of landscapes wherein the forest type is found.
§ Area in ha per landscape.
|| Not included in analyses due to small sample sizes.