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Fire Ecology

Table 1 Average stand structure metrics ± SEM (standard error of the mean) by site for live trees > 12.7 cm DBH at three timesteps (pre-drought, 2016, and 2019). Los Padres National Forest site includes 27 plots and the Sierra National Forest site includes 49 plots of 0.04 ha each. Letters indicate significant differences between timesteps (p < 0.05; repeated measures ANOVA with pairwise t-test or Friedman test with Wilcoxon signed-rank test for pairwise comparisons)

From: Fuels change quickly after California drought and bark beetle outbreaks with implications for potential fire behavior and emissions

 

Pre-drought

2016

2019

Los Padres National Forest

 Mortality (%)

2.3 ± 0.9 a

28.1 ± 5.6 b

33.3 ± 4.4 b

 Basal area (m2 ha−1)

19.1 ± 1.0 a

12.9 ± 1.4 b

13.0 ± 1.5 b

 Trees per ha

400.9 ± 25.8 a

303.8 ± 33.9 b

292.0 ± 35.4 b

 Quadratic mean diameter (cm)

25.2 ± 0.8 a

22.9 ± 0.9 b

23.5 ± 1.0 c

 Stand density index

416.8 ± 22.6 a

296.0 ± 32.4 b

303.6 ± 35.5 b

Sierra National Forest

 Mortality (%)

6.0 ± 1.1 a

44.1 ± 3.9 b

52.8 ± 4.0 b

 Basal area (m2 ha−1)

69.1 ± 4.7 a

43.8 ± 5.0 b

37.7 ± 4.8 b

 Trees per ha

433.7 ± 27.4 a

266.8 ± 28.6 b

226.4 ± 27.2 c

 Quadratic mean diameter (cm)

46.5 ± 1.9 a

44.63 ± 2.3 a

43.1 ± 2.6 a

 Stand density index

1439.2 ± 91.5 a

975.1 ± 101.6 b

961.4 ± 106.6 b

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