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Table 4 Pre- and post-treatment average (standard error) stand characteristics for the five forest-treatment combinations. Due to changes in sampling procedure, not all plots had tree data collected. Sample size (number of plots) for each forest-treatment combination is noted in the table.

From: Effect of Fuel Treatments on Fuels and Potential Fire Behavior in California, USA, National Forests

Forest-treatment1

Status

Tree density (ha−1)

Canopy cover (%)

Canopy base height (m)

Canopy bulk density (kg m−3)

Quadratic mean diameter2 (cm)

SN-MT

Pre

1201 (183)a

71 (11)a

1.2 (1.8)a

0.104 (0.006)a

17.8 (7.6)a

n = 6

Post

578 (141)a

54 (11)a

3.4 (3.0)a

0.066 (0.014)a

25.4 (7.6)a

LN-MT

Pre

427 (126)a

60 (7)a

4.0 (1.2)a

0.054 (0.005)a

38.1 (5.1)a

n = 14

Post

183 (96)a

34 (8)a

7.6 (2.1)a

0.039 (0.007)a

45.7 (5.1)a

RF-MT

Pre

893 (198)a

38 (13)a

1.2 (2.1)a

0.178 (0.0035)a

33.0 (7.6)a

n = 6

Post

561 (151)a

28 (12)a

4.3 (3.4)a

0.122 (0.036)a

43.2 (7.6)a

SN-PF

Pre

462 (141)

74 (7)

4.3 (1.2)a

0.063 (0.009)b

35.6 (5.1)b

n = 10

Post

351 (106)

74 (10)

7.3 (2.4)a

0.049 (0.009)b

38.1 (5.1)b

LN-PF

Pre

408 (86)

49 (5)

3.7 (0.3)a

0.084 (0.008)

35.6 (2.5)

n = 27

Post

356 (69)

46 (6)

6.1 (1.5)a

0.074 (0.007)

38.1 (2.5)

  1. 1 SN, short-needle; LN, long-needle; RF, red fir; MT, mechanical treatment; PF, prescribed fire
  2. 2 75th percentile quadratic mean diameter
  3. a denotes a significant difference (p < 0.01) and b denotes a significant difference (p < 0.05) before and after treatment for the given forest-treatment combination for the specific metric