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Table 2 Gila Wilderness stand structure characteristics by fire treatment. Numbers in parentheses are 1 standard deviation. Small trees are 5 cm to 2.5 cm dbh and large trees are >45 cm dbh. Data followed by different letters within a row differ at α < 0.1. Data followed by a different letter and a * indicate significant differences at α < 0.05.

From: Effects of Multiple Wildland Fires on Ponderosa Pine Stand Structure in Two Southwestern Wilderness Areas, USA

 

Fire Treatment

Structural characteristic

Unburned n = 12

Burn 1x n = 55

Burn 2x+n = 58

2x+preWFU n = 29

Tree density (ha−1)

593 (377)a

478 (268)b

376 (191)b*

170 (75)c*

Mean dbh (cm)

23.2 (9)a

29.6 (10)b

31.1 (8.6)b

51.0 (16)c*

Basal area (m2/ha)

27 (17)a

34 (11)a

29 (13)a

30 (25)a

Stand density index

490 (296)a

589 (51)a

495 (205)a

559 (328)a

Small tree density (ha−1)

308(198)a

185 (192)a

139 (165)b*

65 (62)b*

Large tree density (ha−1)

71 (69)a

113 (66)a

101 (70)a

114 (65)a

Weibull shape

5.2 (2.3)

7.7 (3.8)

7.4 (3.7)

15.0 (12.5)

Weibull scale

24.4 (9)

33.0 (11)

33.6 (9)

54.6 (16)

Shape/scale combined

a

b

b*

c*