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Giant Sequoia Fire History in Mariposa Grove, Yosemite National Park

We reconstructed a 1,438-year history of wildfire in the Mariposa Grove of giant sequoias (Sequoiadendron giganteum). Partial cross sections were taken from 18 dead fire-scarred trees, and the tree rings and fire scars were dated. The resulting master fire chronology shows that fires recurred at intervals ranging from 1 to 15 years. Changes in fire frequency on time scales of centuries are also apparent. This fire history documents the long-term importance of fire in sequoia-mixed conifer ecosystems and illustrates the temporal variability of fire regimes.