Spatial patterns of nineteenth century fire severity persist after fire exclusion and a twenty-first century wildfire in
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RESEARCH ARTICLE
Spatial patterns of nineteenth century fire severity persist after fire exclusion and a twenty-first century wildfire in a mixed conifer forest landscape, Southern Cascades, USA Alan H. Taylor . Catherine Airey-Lauvaux . Becky Estes . Lucas Harris . Carl N. Skinner
Received: 25 February 2020 / Accepted: 14 September 2020 Ó Springer Nature B.V. 2020
Abstract Context Spatial patterns of fire severity are influenced by fire-vegetation patch dynamics and topography. Since the late nineteenth century, fire exclusion has increased fuels and recent fire severity patterns may diverge from historical patterns. Objectives We used data from a 2008 wildfire burning in a landscape with known nineteenth century fire severity patterns to answer the following questions: (1) Were the spatial patterns of fire severity and Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10980-020-01118-1) contains supplementary material, which is available to authorized users. A. H. Taylor (&) Department of Geography and Earth and Environmental Systems Institute, The Pennsylvania State University, University Park, PA 16802, USA e-mail: [email protected]
fire effects after the 2008 fire similar to those in the late nineteenth century? (2) What factors were most important in controlling spatial patterns of fire severity in 2008? Methods Fire severity patterns in the late nineteenth century were identified by Beaty and Taylor (J Veg Sci 18:879, 2001) using dendroecology. Plots were remeasured after the 2008 fire and geospatial layers of vegetation type, topography, fire weather, daily fire extent and fire severity were used to identify controls on 2008 fire severity. Results Fire severity in 2008 varied in ways similar to the nineteenth century. Tree mortality and bark char in plots were lowest on lower slopes and southwest C. N. Skinner Pacific Southwest Research Station, USDA Forest Service, Redding, CA, USA e-mail: [email protected]
C. Airey-Lauvaux L. Harris Department of Geography, The Pennsylvania State University, University Park, PA, USA e-mail: [email protected] L. Harris e-mail: [email protected] B. Estes Pacific Southwest Region, USDA Forest Service, Placerville, CA, USA e-mail: [email protected]
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Landscape Ecol
facing slopes, intermediate on middle slopes, and highest on upper slopes and northeast slopes. At the landscape scale, vegetation type, elevation, slope aspect, slope position and weather were the variables controlling fire severity. Conclusions Spatial patterns of fire severity persisted, despite more than a century of fire exclusion. Our findings suggest that wildfires burning under moderate conditions even with a warming climate can help reduce the fire deficit and promote forest resilience in fire prone landscapes. Keywords Fire severity Resilience Fire exclusion Topography Legacy effects Fire deficit
Introduction In disturbance prone landscapes, disturbance legacy, or ecological memory, helps s
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