Figure 6

Box and whisker plots of biophysical and fire disturbance characteristics of ponderosa pine and grand fir study sites in the Blue Mountains of the Malheur National Forest, Oregon, USA. Available soil water refers to the maximum potential depth that water can be held in a soil column modeled from mapped soil depth, texture, and parent material (Carlson 1974). Maximum vapor pressure deficit refers to the thirty-year average maximum difference between actual vapor pressure and saturation vapor pressure at the same temperature during June and July (PRISM 2015). Density and proportion of total stand basal area consisting of grand fir were calculated within study sites in 2014 and 2015 and serve as indicators of inherent site productivity. MFRI and reconstructed PDSI during fire years were calculated for the period 1650 to 1900.