- Ladder fuels
- Vegetation located below the crown level of forest trees which can carry fire from the forest floor to tree crowns. Ladder fuels may be low-growing tree branches, shrubs. or smaller trees. Practice of fire suppression over the last 100 years has resulted in a dangerous accumulation of ladder fuels.
- Land class
- The topographic relief of a unit of land. Land classes are separated by slope; this coincides with the timber inventory process. The three land classes used in the Forest Plan are defined by the following slope ranges: 0 to 35 percent; 36 to 55 percent; and greater than 55 percent.
- Late forest succession
- The stage of forest succession in which most of the trees are mature. Old growth is a late forest succession. Compare with early forest succession.
- Late-successional, old-growth (LSOG) habitat
- A forest in its mature or old-growth stage.
- Late-successional reserve
- An Option 9 land designation (see AMA, Matrix, and Riparian Reserves). A LSR contains forests set aside from Matrix type logging, to be held in reserve for wildlife habitat. Old clear cuts as well as old-growth forests are in LSRs. Logging is allowed if it will help the LSR reach old growth characteristics faster (see Old Growth Forest).
- Logging residue (slash)
- The residue left on the ground after deforestation. It includes wasted logs, uprooted stumps, broken branches, bark, and leaves. Certain amounts of slash provide important ecosystem roles, such as soil protection, nutrient cycling, and wildlife habitat. Too bad they burn it up.
- See Late Successional Reserve above.