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Fire Timeline composite


Mixed conifer forest change in Lassen Volcanic National Park

Repeat photography (among other methods) shows fire suppression since 1905 has caused increased forest density. Stands are now more dense because seedlings and saplings are not thinned by periodic low-intensity surface fires and there has also been a compositional shift from fire-tolerant to fire intolerant species.  Photos: top to bottom: 1923 (Weislander), 1993 (Taylor), 2009 (Taylor), 2013 (Taylor). All photos were taken from GLO office survey markers.  None of these sites was ever logged. A functioning fire regime was present in these forests until 1905 when fire suppression was implemented. A wildfire burned through the park in 2012.