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Keyword: burn severity

Short- and long-term effects of ponderosa pine fuel treatments intersected by the Egley Fire Complex, Oregon, USA

Publications Posted on: December 04, 2019
Fuel treatments are widely used to alter fuels in forested ecosystems to mitigate wildfire behavior and effects. However, few studies have examined long-term ecological effects of interacting fuel treatments (commercial harvests, pre-commercial thinnings, pile and burning, and prescribed fire) and wildfire.

Contributions of fire refugia to resilient ponderosa pine and dry mixed-conifer forest landscapes

Publications Posted on: August 06, 2019
Altered fire regimes can drive major and enduring compositional shifts or losses of forest ecosystems. In western North America, ponderosa pine and dry mixed-conifer forest types appear increasingly vulnerable to uncharacteristically extensive, high-severity wildfire.

Giving ecological meaning to satellite-derived fire severity metrics across North American forests

Publications Posted on: August 06, 2019
Satellite-derived spectral indices such as the relativized burn ratio (RBR) allow fire severity maps to be produced in a relatively straightforward manner across multiple fires and broad spatial extents. These indices often have strong relationships with field-based measurements of fire severity, thereby justifying their widespread use in management and science.

Got shrubs? Precipitation mediates long-term shrub and introduced grass dynamics in chaparral communities after fire

Publications Posted on: May 30, 2019
Background: Short-term post-fire field studies have shown that native shrub cover in chaparral ecosystems negatively affects introduced cover, which is influenced by burn severity, elevation, aspect, and climate.

Examining post-fire vegetation recovery with Landsat time series analysis in three western North American forest types

Publications Posted on: May 30, 2019
Background: Few studies have examined post-fire vegetation recovery in temperate forest ecosystems with Landsat time series analysis. We analyzed time series of Normalized Burn Ratio (NBR) derived from LandTrendr spectral-temporal segmentation fitting to examine post-fire NBR recovery for several wildfires that occurred in three different coniferous forest types in western North America during the years 2000 to 2007.

Composition and structure of forest fire refugia: What are the ecosystem legacies across burned landscapes?

Publications Posted on: August 17, 2018
Locations within forest fires that remain unburned or burn at low severity—known as fire refugia - are important components of contemporary burn mosaics, but their composition and structure at regional scales are poorly understood.

Characterizing spatial neighborhoods of refugia following large fires in northern New Mexico, USA

Publications Posted on: July 10, 2018
The spatial patterns resulting from large fires include refugial habitats that support surviving legacies and promote ecosystem recovery. To better understand the diverse ecological functions of refugia on burn mosaics, we used remotely sensed data to quantify neighborhood patterns of areas relatively unchanged following the 2011 Las Conchas fire.

Topographic and fire weather controls of contemporary fire refugia in forested ecosystems of northwestern North America

Publications Posted on: July 10, 2018
Fire refugia, sometimes referred to as fire islands, shadows, skips, residuals, or fire remnants, are an important element of the burn mosaic, but we lack a quantitative framework that links observations of fire refugia from different environmental contexts. Here, we develop and test a conceptual model for how predictability of fire refugia varies according to topographic complexity and fire weather conditions.

Next Generation Fire Severity Mapping

Tools Posted on: July 06, 2018
The Next Generation Fire Severity Mapping is a tool designed to depict the probability of high-severity fire, if a fire were to occur, for several ecoregions in the contiguous western U.S. Statistical models were used to generate “wall-to-wall” maps for 13 of the 19 ecoregions. 

Mean composite fire severity metrics computed with Google Earth engine offer improved accuracy and expanded mapping potential

Publications Posted on: June 12, 2018
Landsat-based fire severity datasets are an invaluable resource for monitoring and research purposes. These gridded fire severity datasets are generally produced with pre- and post-fire imagery to estimate the degree of fire-induced ecological change.

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