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Keyword: fire severity

The survival of Pinus ponderosa saplings subjected to increasing levels of fire behavior and impacts on post‐fire growth

Publications Posted on: May 30, 2019
Improved predictions of tree species mortality and growth metrics following fires are important to assess fire impacts on forest succession, and ultimately forest growth and yield. Recent studies have shown that North American conifers exhibit a ‘toxicological dose‐response’ relationship between fire behavior and the resultant mortality or recovery of the trees.

Recent and projected future wildfire trends across the ranges of three spotted owl subspecies under climate change

Publications Posted on: April 08, 2019
A major task for researchers in the twenty-first century is to predict how climate-mediated stressors such as wildfires may affect biodiversity under climate change. Previous model predictions typically did not address non-stationarity in climate-fire relationships across time and space.

A multi-century history of fire regimes along a transect of mixed-conifer forests in central Oregon, U.S.A

Publications Posted on: December 14, 2018
Dry mixed-conifer forests are widespread in the interior Pacific Northwest, but their historical fire regimes are poorly characterized, in particular the relative mix of low- and high-severity fire. We reconstructed a multi-century history of fire from tree rings in dry mixed-conifer forests in central Oregon. These forests are dominated by ponderosa pine (Pinus ponderosa Lawson & C.

Assessing the climate change vulnerability of ecosystem types of the Southwestern U.S

Publications Posted on: October 05, 2018
Climate change is challenging scientists and decision-makers to understand the complexities of climate change and to predict the related effects at scales relevant to environmental policy and the management of ecosystem services. Extraordinary change in climate, and the ensuing impacts to ecosystem services, are widely anticipated for the southwestern United States.

Wind speed and relative humidity influence spatial patterns of burn severity in boreal forests of northeastern China

Publications Posted on: October 05, 2018
We investigated relationships between the spatial patterns of burn severity in Chinese boreal forests and weather parameters. Patch size, shape and arrangement differed between high-severity and low/moderate-severity patches.Wind speed and relative humidity were dominant weather parameters of spatial variation in burn severity.

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. 

What drives low-severity fire in the southwestern United States?

Science Spotlights Posted on: May 15, 2018
Dry conifer forests in the Western United States historically had low impact surface fires approximately every five to 30 years. Due to more than 100 years of successful fire exclusion, however, many of these forests are now denser, and therefore have a greater probability of experiencing intense fires that burn entire stands and convert forests to non-forest landscapes. What environmental conditions are necessary to promote low-severity fire in dry conifer forests? Causes and consequences of high-severity fires are increasingly being studied but little to no research has focused on factors that promote low-severity fires, until now.

Spatiotemporal patterns of unburned areas within fire perimeters in the northwestern United States from 1984 to 2014

Publications Posted on: May 11, 2018
A warming climate, fire exclusion, and land cover changes are altering the conditions that produced historical fire regimes and facilitating increased recent wildfire activity in the northwestern United States. Understanding the impacts of changing fire regimes on forest recruitment and succession, species distributions, carbon cycling, and ecosystem services is critical, but challenging across broad spatial scales.

What drives low-severity fire in the southwestern USA?

Publications Posted on: April 23, 2018
Many dry conifer forests in the southwestern USA and elsewhere historically (prior to the late 1800’s) experienced fairly frequent surface fire at intervals ranging from roughly five to 30 years. Due to more than 100 years of successful fire exclusion, however, many of these forests are now denser and more homogenous, and therefore they have a greater probability of experiencing stand-replacing fire compared to prior centuries.

High-severity fire: Evaluating its key drivers and mapping its probability across western US forests

Publications Posted on: April 23, 2018
Wildland fire is a critical process in forests of the western United States (US). Variation in fire behavior, which is heavily influenced by fuel loading, terrain, weather, and vegetation type, leads to heterogeneity in fire severity across landscapes. The relative influence of these factors in driving fire severity, however, is poorly understood.