Figure 8

Superposed epoch analysis of Palmer Drought Severity Index (PDSI) and fire years in ponderosa pine and grand fir study sites in the Blue Mountains of the Malheur National Forest, Oregon, USA. The y-axis shows scaled mean values of PDSI in the year of fire (year 0 on the x-axis), for five years before the year of fire (negative values on the x-axis), and for four years after fire years (positive values). Blue colored bars indicate a value of a climate index in that year that is significantly departed from mean climate values at the 95 % confidence interval (CI). Note moister antecedent conditions in ponderosa pine sites.