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Fire Ecology
Fig. 4 | Fire Ecology

Fig. 4

From: Historical and modern landscape forest structure in fir (Abies)-dominated mixed conifer forests in the northern Sierra Nevada, USA

Fig. 4

Regression tree results for tree basal area (m2 ha−1) for all trees (>15.2 cm DBH) in (a) historical and (b) modern datasets. Inset histograms show distribution of density data, with bin colors in histograms corresponding to box colors in regression trees. Explanatory variables were from the best-fit model (Additional file 1: Table S1, model 5), and included slope aspect (southwest or northeast; aspect), mean slope (degrees), mean annual climatic water deficit (mm; deficit), and mean 1 April snowpack depth (mm; snowpack)

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