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Table 2 Density reduction factors by species [9] and preliminary SLA for each decay class by tree component for all tree species in the FIADB.

From: Accounting for density reduction and structural loss in standing dead trees: Implications for forest biomass and carbon stock estimates in the United States

Decay class Density reduction factors Structural loss adjustment factors
  Quaking aspen Douglas-fir Top Bark Bole Stump Roots
1 0.970 0.892 1.00 0.92 1.00 1.00 1.00
2 0.750 0.831 0.50 0.66 1.00 1.00 0.95
3 0.540 0.591 0.20 0.39 1.00 1.00 0.80
4 0.613 0.433 0.10 0.21 1.00 1.00 0.65
5 0.613 0.433 0.00 0.00 1.00 1.00 0.50
  1. Note: values represent the proportion of original (live-tree equivalent) component biomass retained at each decay class.
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