Figure 7
From: Human and Climatic Influences on Fire Occurrence in California’s North Coast Range, USA
Superposed epoch analysis (SEA) of PDSI (Cook and Krusic 2004) and PNA (Trouet and Taylor 2009) with years when fires scarred trees on both MESIC and DRY plots or on no plots in the same year during the period from 1700 to 1900 across the North Coast Range study area. A) PDSI compared to fire years, B) PNA compared to fire years, C) PDSI compared to years of no scars, and D) PNA compared to years of no scars. Asterisks above or below bars indicate significant association (P < 0.05) of index condition in that year with the fire event or non-fire year.