Fig. 6From: Pre-Columbian red pine (Pinus resinosa Ait.) fire regimes of north-central Pennsylvania, USAHistorical red pine (Pinus resinosa Ait.) tree characteristics through time and by site factors. A Cumulative distribution of trees based on 267 dead and live trees sampled for fire history (arrows indicate abrupt changes in the number of trees entering the record in the early 1600s and mid-1700s). B Timing of tree establishment years (radial axis) by aspect. C Tree pith year by slope. D Tree pith year by elevationBack to article page