Figure 7
From: Multi-Millennial Fire History of the Giant Forest, Sequoia National Park, California, USA
Comparison of Giant Forest fire history with other giant sequoia, tree-ring based and sedimentary charcoal based fire histories. The Giant Forest record (A) includes fire events recorded by two or more trees (all fire indicators) in 25 yr periods. The five-sequoia grove record (B) includes the events recorded in 20 yr periods in the Giant Forest (Circle Meadow area only), Mariposa, Big Stump, Atwell Mill, and Mountain Home groves (Swetnam 1993). These events are weighted by number of groves recording the same fire date (e.g., a 25 yr period with one four-grove fire event and one three-grove event would have a value of seven). The charcoal abundance series is calculated from five meadow or bog locations in the Sierra Nevada, including Circle Meadow (two cores) in the Giant Forest, and from the Mariposa and Mountain Home groves (R.S. Anderson, Northern Arizona University, unpublished data; Anderson and Smith 1997).