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Table 3 Test statistics by surface fuel load (Mg ha−1), forest floor depth (cm), and seedling density (ha−1) for the 5-year frequency reburn randomized complete block repeated measures linear mixed model for the season and frequency of burn study in the Blue Mountain Ecoregion, Oregon, USA. Values for significant effects α = 0.05 are marked with an asterisk (*). df is the degrees of freedom for which the first number is the numerator and the second number is the denominator to compute the P value.

From: Long-Term Effects of Burn Season and Frequency on Ponderosa Pine Forest Fuels and Seedlings

  Year Treatmenta Year × treatment
Response F P df F P df F P df
1 h (Mg ha−1) 2.90 0.074 2, 25.4 5.77 0.007* 2, 35.6 1.90 0.141 4, 25.4
10 h (Mg ha−1) 1.46 0.248 2, 30 7.74 0.009* 2, 10 4.44 0.006* 4, 30
100 h (Mg ha−1) 8.19 0.002* 2, 27.3 13.81 0.001* 2, 11.4 3.56 0.019* 4, 27.3
1000 h (Mg ha−1) 2.65 0.087 2, 30.7 0.32 0.727 2, 17.3 2.75 0.046* 4, 30.7
Forest floor (cm)b 3.56 0.042* 2, 28.6 105.70 ≤0.001* 2, 10.7 10.57 ≤0.001 4, 28.6
Short seedlings (ha−1)c 6.50 0.006* 2, 23.2 0.57 0.580 2, 11.1 23.20 0.007* 4, 23.2
Tall seedlings (ha−1)d 2.81 0.081 2, 22.9 13.55 0.002* 2, 8.8 1.65 0.196 2, 22.9
  1. a Control (unburned), fall reburn, and spring reburn
  2. b Forest floor depth (cm)
  3. c Short seedlings defined as <0.4 m
  4. d Tall seedlings defined as >0.4 m and <1.37 m