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Title of Journal: Ecosystems

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Abbravation: Ecosystems

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Springer US

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DOI

10.1016/j.anai.2013.12.006

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1435-0629

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Topography Fuels and Fire Exclusion Drive Fire S

Authors: Lucas Harris Alan H Taylor
Publish Date: 2015/06/17
Volume: 18, Issue: 7, Pages: 1192-1208
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Abstract

The number of large highseverity fires has increased in the western United States over the past 30 years due to climate change and increasing tree density from fire suppression Fuel quantity topography and weather during a burn control fire severity and the relative contributions of these controls in mixedseverity fires in mountainous terrain are poorly understood In 2013 the Rim Fire burned a previously studied 2125 ha area of mixedconifer forest in Yosemite National Park Data from 84 plots sampled in 2002 revealed increases in tree density basal area and fuel buildup since 1899 due to fire exclusion A dendroecological fire history and reconstruction of forest structure in 1899 showed that this area historically experienced frequent lowseverity fire In contrast with this region’s historical fire regime burn severity from Landsat imagery showed that this area burned at mixedseverity in the Rim Fire with 13 of plots classified as unchanged 31 low severity 32 moderate severity and 24 high severity A random forest model was used to identify the controls of fire severity in this portion of the Rim Fire using daily area burned daily fire weather and fuels and vegetation data for the surface and canopy Topography tree species composition and cover of forbs and shrubs best explained the fire severity As an example of a reentry burn this study demonstrates how fire exclusion alters fire–vegetation interactions leading to uncharacteristically severe burns and potentially new firevegetation dynamicsSupport for the initial field data collection was provided by the Joint Fire Sciences Program Grant 013312 and additional support was provided by an EW and Ruby S Miller Distinguished Graduate Fellowship from the Department of Geography We thank C N Skinner EAH Smithwick and A Carleton for helpful comments on an earlier draft of this paper This work was completed as partial fulfillment of the requirements for an MS degree in the Department of Geography

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