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Fire Ecology

Table 2 Nested ANOVA of fuel and crown fire potential by treatment following the Fire and Fire Surrogate Study’s fuel treatments in 2002 (immediately after treatment) and in 2016 (following the 2005 to 2012 regional mountain pine beetle outbreak). NumDF and DenDF are the numerator and denominator degrees of freedom used in ANOVA, respectively. aFine woody debris (surface wood < 7.62 cm diameter); bCoarse woody debris (sound surface wood ≥7.62 cm diameter); cLitter and duff (litter and duff layers); dCanopy fuels (foliage and materials<7.62 cm diameter); eCanopy base height (lowest height where canopy bulk density exceeds 0.011 kg m−3); fCanopy bulk density (maximum canopy fuel mass per volume given 4.5 m running mean); gProbability of torching (probability of surface fire ascending into crowns given Monte Carlo simulation); hCrowning index (6.1 m wind speed required to cause active crown fire)

From: Fuel dynamics after a bark beetle outbreak impacts experimental fuel treatments

Response

Source

NumDF

DenDF

2002

2016

F-statistic

P-value

F-statistic

P- value

FWDa (Mg ha−1)

Intercept

1

108

108.85

<0.0001

714.8

<0.0001

Block

2

6

5.93

0.0380

1.33

0.3320

Burning

1

6

24.83

0.0025

1.28

0.3018

Thinning

1

6

32.56

0.0013

8.38

0.0275

Thinning × Burning

1

6

8.94

0.0243

0.11

0.7527

CWDb (Mg ha−1)

Intercept

1

108

71.79

<0.0001

90.25

<0.0001

Block

2

6

0.80

0.4914

0.54

0.6077

Burning

1

6

2.95

0.1369

0.18

0.6890

Thinning

1

6

1.44

0.2758

26.93

0.0020

Thinning × Burning

1

6

1.17

0.3203

2.31

0.1792

LDc (Mg ha−1)

Intercept

1

108

306.12

<0.0001

1916.24

<0.0001

Block

2

6

0.77

0.5028

0.74

0.5160

Burning

1

6

39.95

0.0007

0.12

0.7420

Thinning

1

6

3.93

0.0949

0.20

0.6674

Thinning × Burning

1

6

7.00

0.0382

0.22

0.6538

CFd (Mg ha−1)

Intercept

1

108

276.03

<0.0001

284.01

<0.0001

Block

2

6

1.07

0.3999

2.04

0.2109

Burning

1

6

1.69

0.2409

5.33

0.0604

Thinning

1

6

46.79

0.0005

3.89

0.0959

Thinning × Burning

1

6

0.01

0.9356

1.16

0.3225

CBHe (m)

Intercept

1

105

345.6

<0.0001

258.37

<0.0001

Block

2

6

0.99

0.4251

3.73

0.0884

Burning

1

6

3.03

0.1323

15.03

0.0082

Thinning

1

6

60.38

0.0002

15.67

0.0075

Thinning × Burning

1

6

1.83

0.2247

3.96

0.0938

CBDf (kg m−3)

Intercept

1

105

315.84

<0.0001

1674.82

<0.0001

Block

2

6

0.44

0.6636

3.23

0.1118

Burning

1

6

0.82

0.4012

7.81

0.0314

Thinning

1

6

52.78

0.0003

20.16

0.0041

Thinning × Burning

1

6

0.02

0.9003

0.00

0.9467

PTg (%)

Intercept

1

105

38.18

<0.0001

151.13

<0.0001

Block

2

6

0.13

0.8768

4.32

0.0688

Burning

1

6

22.85

0.0031

0.85

0.3920

Thinning

1

6

15.81

0.0073

18.73

0.0049

Thinning × Burning

1

6

0.57

0.4775

0.40

0.5510

CIh (km h−1)

Intercept

1

105

704.41

<0.0001

306.23

<0.0001

Block

2

6

2.45

0.167

1.49

0.299

Burning

1

6

1.80

0.2288

7.14

0.0369

Thinning

1

6

54.16

0.0003

8.79

0.0251

Thinning × Burning

1

6

0.01

0.9294

1.44

0.2754

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