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Table 2 Spearman rank order correlation values (Rho) for dependent variables with time since fire. Analyses were performed on six sample sites, representing four times since burn. Times since burn include 7 yr, 12 yr, 20 yr, and 83 yr, in Big Basin Redwoods State Park, Boulder Creek, California, USA. Data were collected in 2019 to determine the influence of burns conducted between 1999 and 2011 on vegetation, forest structure, and fuel load

From: Fuel load, stand structure, and understory species composition following prescribed fire in an old-growth coast redwood (Sequoia sempervirens) forest

Variable P Rho
Duff depth (cm) <0.0010 0.60
Litter depth (cm) <0.0010 0.19
Fuel depth (cm) 0.33 −0.045
Coarse woody fuel load (>7.6 cm diameter, Mg ha−1) 0.014 0.15
Fine woody fuel load (<7.6 cm diameter, Mg ha−1) 0.94 0.0052
1-hour fuel load (Mg ha−1) <0.0010 0.40
10-hour fuel load (Mg ha−1) 0.20 0.084
100-hour fuel load (Mg ha−1) 0.30 −0.067
Canopy cover (%) 0.0020 0.28
Sequoia sempervirens stand density (stems ha−1) 0.94 −0.010
Notholithocarpos densiflorus stand density (stems ha−1) 0.0020 0.29
Total stand density (stems ha−1) 0.013 0.23
Sequoia sempervirens relative basal dominance (%) 0.12 −0.14
Notholithocarpos densiflorus relative basal dominance (%) 0.0090 0.24
Total basal area (m2 ha−1) 0.85 −0.020
Density of stems <10 cm DBH and <1 m in height (stems ha−1) 0.15 0.13
Density of stems <10 cm DBH and >1 m in height (stems ha−1) <0.0010 0.52
Understory species richness per plot (number of species) 0.35 −0.090
Understory cover per plot (%) 0.36 −0.080
Shrub species richness per plot (number of species) 0.0060 0.25
Shrub cover per plot (%) <0.0010 0.34