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Figure 5 | Fire Ecology

Figure 5

From: Fire, Drought, and Human History near the Western Terminus of the Cross Timbers, Wichita Mountains, Oklahoma, USA

Figure 5

Timelines depicting changes in the fire environment at the Wichita Mountains. (A) bar graph of the number of fires per decade, (B) reconstructed Palmer Drought Severity Index (PDSI) (Cook et al. 2004) for southwestern Oklahoma (grey line) and a 7-point moving average (black line) emphasizing the lower frequency variability in drought. Triangles indicate fire event years at the study site, (C) timeline of changing cultures and events during the period of fire history, (D) standardized ring-width index chronology of post oak trees (black line), chronology sample depth (grey bars), and pith dates of solid trees (n = 24).

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