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Table 4 Mean plot-level difference (d) in standing dead biomass (oven-dry kg) by tree component and estimation method (1 = CRM vs. CRM+DRF and 2 = CRM vs. CRM+DRF+SLA) for quaking aspen in the Lake States (2005-2009) and Douglas-fir in the Pacific Northwest (2001-2009).

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

   Quaking aspen Douglas-fir
Component Comparison t df p d t df p d
Top and branches 1 56.4 3966 < 0.001 19.6 21.4 2823 < 0.001 94.1
  2 56.8 3966 < 0.001 45.1 21.2 2823 < 0.001 203.1
Bole 1 48.1 3966 < 0.001 65.8 21.2 2823 < 0.001 595.0
  2 48.2 3966 < 0.001 78.1 21.2 2823 < 0.001 672.7
Stump 1 55.0 3966 < 0.001 3.4 23.4 2823 < 0.001 19.0
  2 55.2 3966 < 0.001 4.0 23.5 2823 < 0.001 21.5
Belowground 1 50.6 3966 < 0.001 17.2 21.3 2823 < 0.001 158.4
  2 49.9 3966 < 0.001 26.6 21.2 2823 < 0.001 216.5
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