Fig. 1

US Ecological Provinces and Broad Regions. Each county is assigned to a province based on its forest area’s most common type, as shown by the FIA database. Broad regions are defined by aggregates of the ecoregions: The Pacific Coast region is defined by the blue shaded ecoregions; the Southeastern region is defined as the combination of S.E. Mixed Forest, Outer Coastal Plain, Lower Mississippi Riverine, and Prairie Parkland -Subtropical; the Northeastern region is defined as all the green shaded ecoregions outside of the Southeast. The Arid West is defined by the orange to red shaded ecoregions