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Fire Ecology
Fig. 2 | Fire Ecology

Fig. 2

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

Fig. 2

Regression tree analysis of tree density (TPH; trees 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 selected from the best-fit model (Additional file 1: Table S1, model 4), and included mean June climatic water deficit (mm; deficit), mean annual precipitation (mm; precip), and mean 1 April snowpack depth (mm; snowpack)

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