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Table 3 Nested analysis of variance (F and P) with stand nested within stand age for total C, N, and P (Mg ha−1) in the organic layer and the top mineral soil in 8 yr old, 28 yr old and 60 yr old stands of Pinus douglasiana after high-severity fires in central-western Mexico. Stand age is the fixed effects factor; stand is the nested stand effect, within stand age, as random effects factor.

From: Soil Carbon and Nutrient Recovery after High-Severity Wildfire in Mexico

  Variation source
  Stand age Stand nested within stand age
Parameter F P F P
  Litter layer (LL)
C 6.53 0.031 9.530 ≤0.001
N 7.24 0.025 10.49 ≤0.001
P 8.39 0.018 15.55 ≤0.001
  Duff layer (DL)
C 31.3 0.001 0.962 0.477
N 42.7 ≤0.001 0.477 0.816
P 24.6 0.001 0.631 0.704
  Total organic layer (LL + DL)
C 34.9 ≤0.001 1.240 0.334
N 38.5 ≤0.001 0.762 0.609
P 30.1 0.001 0.802 0.581
  Top mineral soil (0 cm to10 cm)
C 4.71 0.059 1.917 0.133
N 2.43 0.168 1.966 0.124
P 1.07 0.400 14.33 ≤0.001