Table 2 Summary data for delayed mortality predictions based on a 5-year NBR decline threshold of 105 in different forest types in Oregon, Washington, and California (Simpson 2021). The total area burned and area of delayed mortality exclude non-forest cover and areas that were salvage logged. Areas and percentages in parentheses exclude stand-replacing fire (immediate RdNBR > 828). The delta severity metric (Δ SM) represents the change in severity distributions between one and five years post-fire as measured with the severity metric (Lutz et al. 2011). Larger values indicate greater shifts towards higher levels of burn severity
Biophysical environment | Forest type | Area burned (ha) | Delayed mortality (ha) | Delayed mortality (%) | Δ severity metric |
|---|---|---|---|---|---|
Dry | Douglas-Fir | 11,724 (11,275) | 190 (189) | 1.6% (1.7%) | 0.008 |
Hardwoods | 2897 (2828) | 55 (55) | 1.9% (2.0%) | 0.008 | |
Yellow Pines | 3734 (3,520) | 551 (551) | 15% (16%) | 0.035 | |
White Fir/Grand Fir | 17,149 (15,643) | 3066 (3,050) | 18% (19%) | 0.036 | |
Moist | Western Hemlock | 619 (493) | 150 (149) | 24% (30%) | 0.050 |
Cold | Subalpine Fir—Engelmann Spruce | 8607 (4,868) | 1087 (1,073) | 13% (22%) | 0.025 |
California Red Fir—Shasta Red Fir | 461 (450) | 111 (110) | 24% (25%) | 0.048 | |
Mountain Hemlock | 4749 (3,159) | 976 (952) | 21% (30%) | 0.043 | |
Silver Fir | 3808 (3,172) | 1284 (1,271) | 34% (41%) | 0.071 |