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Table 4 Test statistics, P values, and degrees of freedom (df) for fuel consumption by fuel type from a randomized complete block repeated measures analysis for 5-year interval reburns 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

Fuel type

F

P

df

F

P

df

F

P

df

1 hr

0.16

0.851

2, 11.8

0.03

0.876

1, 4.3

0.89

0.436

2, 11.8

10 hr

9.32

0.003*

2, 13.8

21.85

0.008*

1, 4.4

0.11

0.898

2, 13.8

100 hr

20.49

≤0.001*

2, 6.8

4.76

0.057

1, 9.0

10.08

0.009*

2, 6.8

1000 hr

1.04

0.377

2, 15.2

0.65

0.439

1, 10.5

0.42

0.661

2, 15.2

Forest floorb

0.46

0.639

2, 12.7

16.61

0.010*

2, 4.9

4.45

0.034*

2, 12.7

  1. a Fall or spring reburn
  2. b Litter and duff combined depth (cm)